A lithium bromide absorption refrigerating machine, using a water solution of lithium bromide as the

A dilution cycle control system for an absorption refrigeration system is disclosed. The control system includes a time delay relay for sensing shutdown of the absorption refrigeration system and for generating a control signal only after expiration of a preselected time period measured from ...

A dilution cycle control system for an absorption refrigeration system is disclosed. The control system includes a time delay relay for sensing shutdown of the absorption refrigeration system and for generating a control signal only after expiration of a preselected time period measured from ...

The book presents the fundamental principles, systems, and practices of refrigeration. Emphasizing energy conservation, it offers applications of the refrigeration systems and equipment. Topics covered include: physical principles; the vapor compression refrigeration system: Pressure-enthalpy diagrams; thermodynamics of the vapor ...

A new absorption cycle, using heat as the energy source, was proposed to produce refrigeration. This proposed cycle, referred to as the single-effect regenerative absorption cycle or cycle 1R, has a performance much superior to the well-known basic ...

Because the absorption refrigeration system uses the Lithium bromide- water solution as refrigerant, it is profitable for the environment that human beings are living since the values of ODP and GWP of the refrigerant almost are zero. However, the low COP of the absorption machine was limited ...

Because the severe conditions imposed by ambient temperatures on solar refrigeration equipment in the tropics limit the choice of an absorption system, the thermokinetic characteristics of a calcium chloride/ammonia absorption cycle were examined. The refrigeration equipment employed works in ...

An absorption refrigeration system has an intermediate temperature desorber-resorber pair. A valve between the desorber-resorber pair is modulated to control the capacity for load matching.

An absorption refrigeration system has an intermediate temperature desorber-resorber pair. A valve between the desorber-resorber pair is modulated to control the capacity for load matching.

Requirements for cooling are related to the need to be able to maintain foodstuffs in good condition with the aid of refrigeration and the desirability to provide a comfortable indoor environment by air conditioning. The representation of the desired conditions in a room by a point on a psychrometric chart is considered together with processes of sensible cooling, cooling and ...

This report describes the modifications and repairs made to the 200 ton absorption refrigeration pilot plant since April 1992, when Clarkson University assumed responsibility for it. Current operating problems and the performance of the plant, achieved to...

We look at the operation of compression/absorption cycle machines in order to produce a high-temperature heat pump. The useful effect of the machine lies in the absorber during absorption of vapour with a high refrigerant content by the solution with a lo...

A review of the current technology and achievements in the research and development of solar cooling systems is presented. Brief discussions on Rankine cycle engines, absorption refrigeration cycles, and open-cycle absorption systems are included.

The Intermittent Solar Ammonia Absorption Cycle (ISAAC) refrigerator is a solar thermal technology which provides low cost, efficient, reliable ice-making to areas without ready access to electricity. An ISAAC refrigeration system consists of a compound p...

A new absorption cycle, using heat as the energy source, was proposed to produce refrigeration. This proposed cycle, referred to as the single-effect regenerative absorption cycle or cycle 1R, has a performance much superior to the well-known basic ...

A seven-effect absorption refrigeration cycle is disclosed utilizing three absorption circuits. In addition, a heat exchanger is used for heating the generator of the low absorption circuit with heat rejected from the condenser and absorber of the medium absorption circuit. ...

A seven-effect absorption refrigeration cycle is disclosed utilizing three absorption circuits. In addition, a heat exchanger is used for heating the generator of the low absorption circuit with heat rejected from the condenser and absorber of the medium absorption circuit. ...

A lithium bromide absorption refrigerating machine, using a water solution of lithium bromide as the working substance, is briefly described and illustrated by a line diagram and s-t diagram. The machine operation is analyzed as a two-cycle system: the di...

The diffusion-absorption heat pump offers advantages including no moving parts, noise and vibration free operation and operation without electric power. An example of such a cycle is the gas-fired domestic refrigerator. The cycle is similar to an absorpti...

There are a number of known absorption cycles capable of ''triple-effect'' refrigeration. Among the basic triple-effect cycles only one particular cycle is able to use ammonia-water (NH(sub 3)/H(sub 2)O) as the absorption fluid pair. This cycle uses two ...

A solar-powered absorption refrigeration apparatus is described comprised of: (a) a pressure vessel of approximately circular cross-section for containment of a liquid absorbent solution containing absorbed refrigerant; (b) a solar-radiation reflector for concentrating solar radiation onto the pressure vessel; (c) a condenser for ...

Absorption chillers are heat-operate refrigeration without harmful environmental emissions (CFCs, HCFCS, and HFCS). The machine uses either steam or a gas-fired burner as the energy source and utilizes endothermic evaporation to provide refrigeration to an external process fluid, usually chilled water. In the United States, ...

Solar icemaking is a logical technology for developing countries. If solar radiation is harnessed for cooling purposes, the peak supply of useful energy will generally coincide with peak demand for refrigeration, while the use of the solar cooling effect to produce ice will provide energy storage during low radiation periods. This report provides a brief history of ...

Sessions included: HFC blown polyurethanes, carbon dioxide blown foam and extruded polystyrenes, plastic foam insulations, evacuated panel insulation, refrigeration and air conditioning, absorption and adsorption and stirling cycle refrigeration, innovative cooling technologies, and natural ...

The objectives of the research reported is to develop and analyze new concepts for absorption cycles to improve the performance or reduce the cost of a 3-ton absorption chiller that can be used with solar collected heat. New refrigerant-absorbent pairs are investigated, as are additives to currently used ...

namely a lithium bromide/water absorption refrigeration system. A new ana- ... compared to other single-stage absorption units at the same cycle temperatures. ...

Three solar-powered cooling concepts are analyzed and evaluated. These are: (1) the solar Rankine concept in which a Rankine cycle driven by solar energy is used to drive a vapor compression refrigeration machine, (2) the solar-assisted Rankine concept in which a Rankine cycle driven by both solar energy and fuel combustion is used to ...

In an era of heightened awareness of energy efficiency and the associated environmental impacts, many industries, worldwide, are exploring ``environmentally friendly`` technologies that provide equivalent or improved performance while reducing or eliminating harmful side effects. The refrigeration and air conditioning industry, due to its reliance on CFCs and HCFCs has ...

... test apparatus designed to simulate the Stirling refrigeration cycle. ... Coolers; Stirling cycle; Thermoacoustic refrigerators; Refrigerators; ...

Solar cooling for commercial applications using open cycle absorption refrigeration systems was investigated. If an open cycle absorption can be operated as a chemical heat pump for winter heating operation, the system offers year round operation that makes the system economically viable for ...

Absorption refrigeration technology can be an economical and cost effective means of reducing energy cost and/or improving the efficiency and output of your process. We believe the potential benefits of absorption refrigeration technology have generally been overlooked by the process industry. This paper will ...

Absorption cycle refrigeration processes and systems are provided which are driven by the sensible waste heat available from industrial processes and other sources. Systems are disclosed which provide a chilled water output which can be used for comfort conditioning or the like which utilize heat from sensible waste heat sources at ...

Every solar refrigeration process suitable for arid land must work with an air cooled condenser and absorber. It is shown that such equipment can be made by adapting commercially available absorption machines to concentrators presently developed. Solar absorption cooling is compared to solar cooling with Rankine ...

Countercurrent flow absorber and desorber devices are provided for use in absorption cycle refrigeration systems and thermal boosting systems. The devices have increased residence time and surface area resulting in improved heat and mass transfer characteristics. The apparatuses may be incorporated into open cycle ...

Countercurrent flow absorber and desorber devices are provided for use in absorption cycle refrigeration systems and thermal boosting systems. The devices have increased residence time and surface area resulting in improved heat and mass transfer characteristics. The apparatuses may be incorporated into open cycle ...

In the design of solar collector/regenerators for use in open cycle absorption refrigeration (OCAR) units, the problem of predicting evaporation mtes and solution temperatures is of paramount importance in determining overall cycle performance. The govern...

An assessment of the state of the art in refrigeration and insulation technologies is carried out to evaluate the potential for efficient substitutes for CFCs and HCFCs to facilitate the transition to a CFC-free environment. Opportunities for improved efficiency in domestic refrigeration, building chillers, commercial refrigeration and ...

An assessment of the state of the art in refrigeration and insulation technologies is carried out to evaluate the potential for efficient substitutes for CFCs and HCFCs to facilitate the transition to a CFC-free environment. Opportunities for improved efficiency in domestic refrigeration, building chillers, commercial refrigeration and ...

Techniques for converting solar energy into mechanical energy for use in small-to-large scale refrigeration systems are examined. The systems considered included a Rankine cycle, 106 kW system coupled to 58 sq m of flat plate collectors, photovoltaic panels with storage in the form of ice, a positive ventilation and ice bank cooling system, ammonia-water ...

The author says direct heat integration is the best way to use heat that would otherwise be rejected. To recover low level heat, there are several possibilities that the author discusses in detail. They are: heat distribution systems, liquid runaround systems, organic Rankine cycles, and absorption refrigeration.

The current utilization of wood burning cook stoves in Brazil and the socio- economical profile of their users were surveyed. A traditional heavy-mass wood- burning cook stove was studied as a thermal equipment. Simple changes in the geometry of the combu...

... Title : Internal Heater Module for Cryogenic Refrigerators and Stirling Heat Engines. ... refrigerator, or to a Stirling cycle heat engine, with and by the ...

A model has been developed for the design and optimization of a small bubble pump to be used in a single pressure absorption refrigeration cycle to lift the working fluid mixture against gravity and overcome flow friction. This analytical model is developed from two-phase flow fundamentals and incorporates the design parameters of the ...

A numerical model for the performance of an ammonia-water absorption cycle in solar air conditioning, refrigeration, and heat pump systems are presented. The configurations comprise a solar driven generator, a rectifier, condenser, evaporator, absorber, preheater, and a subcooler. Cooling modes involve supplying heat to the evaporator ...

Compatibility of the Brayton power and refrigeration cycles is considered. Performance of the power-

The diffusion-absorption heat pump (DAHP) offers advantages including no moving parts, noise and vibration free operaton and operation without electric power. An example of such a cycle is the gas-fired domestic refrigerator. The cycle is similar to an absorption cycle but ...

The study deals with a solar system for refrigeration specially designed for remote areas. The thermodynamic cycle, using an ammonia-water absorption, only consumes thermal energy and is easy and cheap to produce by direct conversion of solar radiation. I...

This invention relates to a process for purifying and liquefying a natural gas stream comprising the steps of passing said stream through absorption units to remove impurities, compressing said stream, liquefying said stream by heat exchange with a low temperature nitrogen refrigeration cycle, stripping the nitrogen from said liquefied ...

Recent activities in refrigeration technology in Japan are discussed. Stirling cycle refrigerators and magnetic refrigerators are discussed. The development of units for use on trains is discussed.

... Accession Number : AD0886824. Title : Vuilleumier Cycle Cryogenic Refrigeration System for Missile Guidance Applications. ...

... Accession Number : AD0886823. Title : Vuilleumier Cycle Cryogenic Refrigeration System for Infrared Scanner Applications. ...

... Accession Number : AD0841543. Title : VUILLEUMIER CYCLE CRYOGENIC REFRIGERATOR DEVELOPMENT. Descriptive Note : Final rept. ...

A Stirling-cycle refrigerator has a three-pump configuration and pumping sequence, in which one pump

... Accession Number : AD0276467. Title : MECHANICS OF HEAT PUMPS AND ABSORPTION REFRIGERATION: AN ANNOTATED BIBLIOGRAPHY. ...

A lithium bromide absorption chiller has been successfully used to provide refrigeration for field conditioning of natural gas. The intent of the study was to identify a process that could provide a moderate level of refrigeration necessary to meet the quality restrictions required by natural-gas transmission companies, minimize the ...

Sep 16, 2010 ... The cold cycle dilution refrigerator is a continuous refrigerator capable of cooling to temperatures below 100 mK that makes use of a novel ...

This thesis is a theoretical and experimental study of the thermodynamics of the Stirling cycle, operating as a refrigerator or heat pump. The thesis shows that the Stirling cycle is able to compete with the vapour compression cycle, in terms of energy ef...

An apparatus and method for warm-liquid defrosting of the evaporator of a refrigeration system. The apparatus includes a first refrigerant expansion device that selectively expands refrigerant for cooling the evaporator, a second refrigerant expansion device that selectively expands the ...

The feasibility of using a solar absorption refrigeration cycle for space cooling and heating is analyzed. Working mixtures considered are NH/sub 3/-H/sub 2/O and H/sub 2/O-LiBr. The properties of the cycle used for cooling and as a heat pump system are discussed with the aid of flow diagrams. Results of a ...

This book is a fundamental text on refrigeration principles, equipment, and systems. Energy utilization and conservation are stressed. Extensive use is made of tables, charts, and worked-out examples. Contents, abridged: Physical principles. Heat transfer in refrigeration: evaporators. Absorption refrigeration. ...

Various technical options for developing a solar operated refrigerator were discussed. Their suitability for being used as a vaccine store for the conditions specified by the World Health Organization Expanded Program on Immunization (EPI) were evaluated. A model to predict the performance of a photovoltaic refrigerator was developed and used to identify ...

This book supplies the basics of design, from selecting the optimum system and equipment to preparing the drawings and specifications. It discusses the four phases of preparing a project: gathering information, developing alternatives, evaluating alternatives, and selling the best solution. In addition, the author breaks down the responsibilities of the engineer design documents, computer aided ...

The study of solar air conditioning in a hot arid climate was carried out. It consisted of four different approaches: the use of an absorption system and in this case use of a Li-Br unit. A typical set of results has been included: a Rankine engine has been described and compared with the Li-Br cycle and an intermitted solar-powered ...

The objectives of this study were: (1) to perform a detailed thermodynamic cycle analysis of the basic and various modified absorption air conditioning systems under steady state and transient conditions, for a variety of absorbent-refrigerant combinations; (2) to study the effects of deviations of actual process from ideal processes ...

It is shown that the inertia of a solar refrigerator depends on the heat capacity of the working solution contained by it. Various combinations of refrigerants are tested. 7 references.

A long-life Joule-Thomson refrigerator which is heat powered, involves no sealing, and has few mechanical parts is desirable for long-term sensor cooling in space. In the gas-sorption J-T refrigerator, cooling is achieved by gas sorption (either adsorption or absorption) processes. Currently, a modular, single-stage ...

In summer absorption refrigerating machines provide cold water using excess heat from municipal thermoelectric power plant through district heating pipelines, which reduces peak electric load from electricity networks in summer. The paper simulates annual dynamic load of a real project to calculate the first investments, annual operation cost and LCC ...

Previous papers have dealt with the comparisons of absorption and centrifugal chillers and indicated the benefits of using absorption machines. Also, the ideal thermodynamic performances and limitations of absorption cycles have been derived. Nevertheless, the need to update this recent work is necessary for ...

This annual report presents work performed during calendar year 1993 by the Florida Solar Energy Center under contract to the US Department of Energy. Two distinctively different solar powered indoor climate control systems were analyzed: the open cycle l...

An indirect-heated gas turbine cycle is bottomed with a fuel cell cycle with the heated air discharged from the gas turbine being directly utilized at the cathode of the fuel cell for the electricity-producing electrochemical reaction occurring within the fuel cell. The hot cathode recycle gases provide a substantial portion of the heat required for the ...

An indirect-heated gas turbine cycle is bottomed with a fuel cell cycle with the heated air discharged from the gas turbine being directly utilized at the cathode of the fuel cell for the electricity-producing electrochemical reaction occurring within the fuel cell. The hot cathode recycle gases provide a substantial portion of the heat required for the ...

An indirect-heated gas turbine cycle is bottomed with a fuel cell cycle with the heated air discharged from the gas turbine being directly utilized at the cathode of the fuel cell for the electricity-producing electrochemical reaction occurring within the fuel cell. The hot cathode recycle gases provide a substantial portion of the heat required for the ...

This invention relates to heating and cooling systems and more particularly to an improved system utilizing a Stirling Cycle engine heat pump in a refrigeration cycle. 18 figs.

This invention relates to heating and cooling systems and more particularly to an improved system utilizing a Stirling Cycle engine heat pump in a refrigeration cycle.

This bibliography contains citations concerning cryogenics using magnetic refrigerants. Refrigerant properties, magnetic materials, and thermal characteristics are discussed. Magnetic refrigerators are used for helium liquefaction, cooling superconductors, and superfluid helium production. Carnot-cycle ...

The bibliography contains citations concerning cryogenics using magnetic refrigerants. Refrigerant properties, magnetic materials, and thermal characteristics are discussed. Magnetic refrigerators are used for helium liquefaction, cooling superconductors, and superfluid helium production. Carnot-cycle ...

The bibliography contains citations concerning cryogenics using magnetic refrigerants. Refrigerant properties, magnetic materials, and thermal characteristics are discussed. Magnetic refrigerators are used for helium liquefaction, cooling superconductors, and superfluid helium production. Carnot-cycle ...

The bibliography contains citations concerning cryogenics using magnetic refrigerants. Refrigerant properties, magnetic materials, and thermal characteristics are discussed. Magnetic refrigerators are used for helium liquefaction, cooling superconductors, and superfluid helium production. Carnot-cycle ...

The bibliography contains citations concerning cryogenics using magnetic refrigerants. Refrigerant properties, magnetic materials, and thermal characteristics are discussed. Magnetic refrigerators are used for helium liquefaction, cooling superconductors, and superfluid helium production. Carnot-cycle ...

The bibliography contains citations concerning cryogenics using magnetic refrigerants. Refrigerant properties, magnetic materials, and thermal characteristics are discussed. Magnetic refrigerators are used for helium liquefaction, cooling superconductors, and superfluid helium production. Carnot-cycle ...

The report describes the accomplishments on the development of an air cooled Vuilleumier (VM) cycle, cryogenic refrigeration system for cooling an advanced low altitude infrared scanner system. The refrigeration system consists of the refrigerator and a c...

Contents: Introduction-Helium as a refrigerant; The relationship of refrigerators and liquefiers; Counterflow heat exchangers; The Joule-Thomson process; The Brayton and Claude cycles; Expanders; The Gifford-McMahon cycle; Modern refrigerators and liquefi...

The diffusion-absorption heat pump offers advantages including no moving parts, noise and vibration free operation and operation without electric power. An example of such a cycle is the gas-fired domestic refrigerator. The cycle is similar to an absorption cycle but ...

A novel ammonia-water thermodynamic cycle, capable of producing both power and refrigeration, was proposed by D. Yogi Goswami. The binary mixture exhibits variable boiling temperatures during the boiling process, which leads to a good thermal match between the heating fluid and working fluid for efficient heat source utilization. The ...

The concepts of generalized polytropic processes and polytropic refrigeration cycles, which consist of two isothermal processes and two generalized polytropic processes of paramagnetic salt, are introduced. It is shown that such a class of general magnetic refrigeration cycles, which includes the Carnot, Stirling, ...

... Abstract : In published analyses of the Vuilleumier refrigeration cycle, it has been assumed that the gas in the various volumes of the system go ...

... Abstract : The patent relates to the hot cylinder for a Vuilleumier cycle cryogenic refrigerator having an annular liner positioned between the hot ...

Modular adsorption/Joule-Thomson-effect refrigerator offers fast regeneration; adsorption/desorption

A refrigeration cycle is proposed for development which can reduce compressor work and increase cooling effect, by eliminating a portion of the ...

Closed-cycle operation of molecular adsorption refrigeration systems (MARS) has been demonstrated by

The major advantages of this refrigeration system include modular capability, ... Terrestrial application include freon- free refrigeration systems for ...

This annual report presents work performed during calendar year 1993 by the Florida Solar Energy Center under contract to the US Department of Energy. Two distinctively different solar powered indoor climate control systems were analyzed: the open cycle liquid desiccant dehumidifier, and an improved efficiency absorption system which may be fired by flat ...

Arizona State University has built a test facility to evaluate the steady state and transient performance characteristics of residential sized refrigeration units for solar applications. This paper reports significant findings related to the cold start-up and the on-off cycling of a commercial three-ton lithium bromide/water absorption ...

A study is presented of solar air conditioning systems based on ammonia-water as the refrigerant-absorbent pair, with particular attention given to the types of absorption cycles which may be suitable. The use of double effect distillation, double evaporation, and heat recuperation for improving cycle efficiency is ...

The Intermittent Solar Ammonia Absorption Cycle (ISAAC) refrigerator is a solar thermal technology which provides low cost, efficient, reliable ice-making to areas without ready access to electricity. An ISAAC refrigeration system consists of a compound parabolic solar collector, two pressure vessels, a condenser, ...

The Intermittent Solar Ammonia Absorption Cycle (ISAAC) refrigerator is a solar thermal technology which provides low cost, efficient, reliable ice-making to areas without ready access to electricity. An ISAAC refrigeration system consists of a compound parabolic solar collector, two pressure vessels, a condenser, ...

This report describes the modifications and repairs made to the 200 ton absorption refrigeration pilot plant since April 1992, when Clarkson University assumed responsibility for it. Current operating problems and the performance of the plant, achieved to date, are detailed. Performance has been limited by small air leaks into the ...

... Title : Transient Optimization of a Brayton Cycle ... Brayton cycle, Performance( Engineering), Optimization, Cooling, Rates, Transients. ...

The refrigerated trailer and container segments of the transportation industry are evaluated as potential entry markets for a proposed absorption refrigeration technology. To perform this analysis the existing transportation refrigeration industry is char...

The determination of properties of zeolite/refrigerant combinations of solar refrigeration systems are reviewed in this final report. The US DOE has funded several studies aimed at identifying potential rerigerant/absorption pairs for solar cooling applic...

The development and proof testing of advanced absorption refrigeration cycle concepts is reported. The purpose is to develop a gas fired absorption heat pump for residential and small commercial applications that will produce a coefficient of performance of at least 1.6 Btu heating and .7 Btu of cooling per Btu of ...

Because manufacturers of household refrigerators are facing two important problems, the replacement of refrigerant R12 and the need to improve efficiency, there is a need to develop a model of the refrigerator which greatly reduces the computer time required to evaluate the refrigeration cycle. ...

A theoretical analysis of the coefficient of performance was undertaken to examine the efficiency characteristics of R22 + DMF, R134a + DMF, R32 + DMF as working fluids, respectively, for a single-stage and intermittent absorption refrigerator which allows the use of heat pipe evacuated tubular collectors. The modeling and simulation of the performance ...

A process and apparatus is described for liquefying natural gas using two closed cycle, multicomponent refrigerants wherein a low level refrigerant cools and liquefies the gas by indirect heat exchange and a high level refrigerant cools and partially liquefies the low level refrigerant by ...

It is shown that the performance of single-state ammonia/water absorption cycles (COPs up to 0.8) is appreciably superior to that of commercial single-state water/lithium bromide appliances (COPs up to 0.72), with ammonia/water cycles having the additional advantage of satisfactory operation with air cooling and in ...

The bibliography contains citations of selected patents concerning the design and application of absorption refrigeration systems. Citations cover refrigeration, cooling/heating, and chilling devices. Combination heat pump/absorption and mechanical/absorption refrigeration ...

The present invention is intended to remove foreign matter such as worn powder in a refrigerating cycle and enhance the reliability in a refrigerating cycle using, in particular, HFC refrigerant. In the invention, accordingly, a coil shaped connection piping is provided in at least front ...

A new power-generation technology, often referred to as the Kalina cycle, is being developed as a direct replacement for the Rankine steam cycle. It can be applied to any thermal heat source, low or high temperature. Among several Kalina cycle variations, there is one that is particularly well suited as a bottoming ...

... Accession Number : AD0888992. Title : Vuilleumier Cycle Cryogenic Refrigeration System Technology Report. Descriptive Note : Final rept. ...

... Accession Number : ADA027055. Title : Vuilleumier Cycle Cryogenic Refrigeration. Descriptive Note : Final rept. Feb-Aug 1975. ...

... Title : Two-Stage Vuilleumier Cycle Cryogenic Refrigeration System for Advanced Forward Looking Infrared (AFLIR) Applications. ...

This report describes a data acquisition and display system that automatically monitors the performance of the 4.5 -K closed-cycle refrigerators used to ...

rotary, reciprocating; 6) Vuilleumier cycle refrigerator; 7) Joule-Thompson ... Vuilleumier Cycle Refrigerator (VM - Third-Stage) in Develoment at ...

... Abstract : The object of this program was to develop a Split-Stirling cycle cooler capable of producing .6 watts of refrigeration in a 120 F ambient ...

All the available experimental evidence suggests that the optimum organic absorbent/refrigerant combination would be a methane derivative with a single hydrogen atom with chlorine and fluorine atoms in the other sites, as refrigerant. This would be hydrogen bonded to an absorbent molecule containing the group =NC-O, with the substituent groups being such ...

All the available experimental evidence suggests that the optimum ''organic'' absorbent/refrigerant combination would be a methane derivative with a single hydrogen atom with chlorine and fluorine atoms in the other sites, as refrigerant. This would be hydrogen bonded to an absorbent molecule containing the group =NC/sup ...

This study deals with a solar system for refrigeration specially designed for remote areas conditions. So, it must be very simple and reliable, and in addition it must be also mechanically self-operating. The thermodynamic cycle used is an ammonia-water a...

With today's high fuel prices, energy conservation projects to utilize low level waste heat have become more attractive. Exxon Chemical Company Central Engineering has been developing guidelines and assessing the potential for application of low level heat recovery technology. This paper discusses heat distribution systems, latest developments in absorption ...

This report describes the development of an ultraminiature, Vuilleumier (VM) cycle, cryogenic refrigeration system for infrared type systems. The refrigerator that was designed and fabricated is a liquid cooled machine producing 0.75 watt of refrigeration...

The refrigerated food/medical sample storage compartment as a kit to the space shuttle orbiter is examined. To maintain the -10 F in the freezer kit, an active refrigeration unit is required, and an air cooled Stirling Cycle refrigerator was selected. The...

A refrigeration system/cycle includes two or more refrigeration stages, in which one or more of the warmer stages provide(s) cooling to partially compensate for heat leakage that would otherwise leak to the colder stage(s). The refrigeration system includ...

This primer on gas cooling systems explains the basics of heat exchange within a refrigeration system, the principle of reverse-cycle refrigeration, and how a gas-engine-driven heat pump can provide cooling, additional winter heating capacity, and hot water year-round. Gas cooling equipment available or under development include ...

The consultant traveled to Morocco to assess the equipment requirements for the vaccine cold chain, comparing the need for additional absorption refrigeration systems with the financial viability of a conversion to photovoltaic powered vapor compression equipment. The consultant found that bottled gas has proven to be a cost effective and available fuel ...

This study deals with a solar system for refrigeration specially designed for remote areas conditions. So, it must be very simple and reliable, and in addition it must be also mechanically self-operating. The thermodynamic cycle used is an ammonia-water absorption one. It consumes only thermal energy, which is easily and cheaply ...

This report gives a short introduction to the principles of absorption refrigeration plants. A measuring program for a large lithium bromide-water absorption refrigeration plant has been conducted during the summer 1987 at Herlev Hospital. The plant is dr...

Attention is given to calculations of the energy use of buildings, innovations of the heat pump cycle, rating of refrigerant-to-air heat transfer equipment, and energy conservation through improved fenestration treatment. Solar heating and cooling systems are considered with particular emphasis on the University of Pennsylvania solar heating/cooling ...

The report describes the development of a Vuilleumier (VM) cycle, cryogenic refrigeration system for forward looking infrared (FLIR) type systems. The refrigerator that was designed and fabricated is a liquid cooled, two-stage machine composed of the refr...

A lower stage chemisorption refrigeration system physically and functionally coupled to an upper stage physical adsorption refrigeration system is disclosed. Waste heat generated by the lower stage cycle is regenerated to fuel the upper stage cycle thereb...

The wave length of an infrared, semiconductor laser diode is maintained substantially constant by maintaining the diode temperature constant. The diode is carried by a cold tip of a closed cycle helium refrigerator. The refrigerator has a tendency to caus...

The coefficient of performance of the Ericsson refrigeration cycle of paramagnetic salt is derived. It is used to discuss the performance of the refrigerators. Thereby, it is expounded that the refrigerators have some new characteristics.

from the storage tank during refrigerator cooldown. The heat exchanger .... 20000 hours of operation and has exhibited no failures or significant symptoms ... with closed- cycle helium refrigeration systems. The author also thanks ...

Work on a miniature, reciprocating, closed-cycle cryogenic refrigerator for space applications has been under way since mid-1962. Now in an advanced stage of development, the refrigerator uses a reversed Brayton cycle to achieve a capacity of 2 watts at 7...

In its most basic version, the chemically assisted mechanical, CAM, refrigeration cycle operates as follows: A pressurized solution of refrigerant gas dissolved in a liquid solvent is introduced into an evaporator-effervescer, EE, where, at reduced pressu...

Generally, the basis of efficiency calculations and optimization studies of absorption cycles is the first law of thermodynamics. It is often argued that a first-law analysis does not produce all the information needed to optimize the absorption system. According to this line of thought, only an analysis based on the second law of ...

This report presents an analysis of the performance of the energy delivery subsystem composed of a steam generator and superheater, a steam engine, and steam condensing equipment. When combined, the thermodynamic processes involved in this subsystem form a basic Rankine power cycle. Water is the cycle working fluid. The prime mover is a Skinner RV-1 ...

The aim of the paper is to present the performance characteristics of a Stirling refrigeration cycle in micro/nano scale, in which the working substance of cycle is an ideal Maxwellian gas. Due to the quantum boundary effect on the gas particles confined in the finite domain, the cycle no longer possesses the ...

... 4. Regenerators----- 55 ... with displacers, two thermal regenerators, three heat exchange areas, connecting ...

... AD0680592. Title : CALCULATION OF THE COEFFICIENT OF PERFORMANCE OF A VAPOR CYCLE REFRIGERATION SYSTEM. ...

Multi-effect regenerative absorption cycles which provide a high coefficient of performance (COP) at relatively high input temperatures. An absorber-coupled double-effect regenerative cycle (ADR cycle) (10) is provided having a single-effect absorption cycle (SEA ...

Performance simulation has been carried out for several LiBr/H2O triple-effect cycles using the Absorption Simulation Model (ABSIM) . The systems investigated include the three-condenser-three-desorber (3C3D) cycle, forming an extension of the conventional double-effect cycle; and two cycles ...

Nowadays, the problem of the environment goes worse, it urges people to research and study new energy-saving and environment-friendly refrigerants, such as carbon dioxide, at present, people do research on carbon dioxide at home and abroad. This paper introduces the property of carbon dioxide as a refrigerant, sums up and analyses carbon dioxide ...