A flow sheeting program, SHPUMP, was developed for simulating different absorption heat cycles. The program consists of ten different modules which allow the user to construct his own absorption cycle. The ten modules configurate evaporators, absorbers, g...
National Technical Information Service (NTIS)
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 ...
DOEpatents
Absorption cycles like the absorption heat pump or the absorption heat transformer can contribute to savings on one of the earth's resources, energy. Because of the high initial expenses, application of an conventional absorption apparatus is only ...
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...
Gas fired absorption heat pumps for space conditioning (heating and air conditioning) are being developed by several US organizations. Single-effect cycle absorption heat pumps for residential applications were developed in the 1970's, but proved to be uneconomic ...
Energy Citations Database
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 ...
In the near future, heat pumps will start to flood the heating market. More generally, a market of systems usable for both heating and cooling is beginning to impose itself. This can be achieved by vapor-compression cycles, absorption cycles or others. Th...
Absorption heat pumps have received renewed and increasing attention in the past two decades. The rising cost of electricity has made the particular features of this heat-powered cycle attractive for both residential and industrial applications. Solar-pow...
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...
The possibilities for storing thermal energy by means of an absorption cycle are described. In such a cycle two components of a mixture are separated by the supply of energy (heat or mechanical energy). The components can be stored at ambient temperature;...
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 ...
NASA Astrophysics Data System (ADS)
An analysis of alternative approaches to the use of solar energy for heating applications is presented. Three heat pump configurations are considered as alternatives to direct heat exchange. These are two configurations of a vapor compression heat pump driven by a solar-powered Rankine engine and a solar-powered ...
DOE Information Bridge
... Abstract : The purpose of this study is to determine whether an absorption- type power cycle using a mixture of ammonia and water as the working ...
DTIC Science & Technology
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 ...
The state-of-art in ammonia-water absorption cooling has been applied to an air-source heating-only heat-pump cycle which delivers its heat indoors via circulating liquid. The cycle is described, differences from the cooling application noted, and test results on a 14.65-kW ...
The performance of three combined absorption/vapor compression cycles for gas-fired internal combustion engine driven heat pumps was assessed in a theoretical study. Two cycles were selected for the preliminary design of breadboard systems using only off-...
The development of energy efficient, thermally activated heat pumps for heating and cooling is reported. A breadboard system with a 32.5%-BHP-efficient linear engine in the final phase of steady state was tested. The absorption heat pump advanced cycle program is in progress. Analysis confirms ...
A schematic of the solar energy system and the HVAC equipment is shown. A paraffinic oil is circulated through the collector array and exchanges heat to water in a tube or shell heat exchanger. Hot water is pumped to either a Rankine cycle or absorption unit. The two systems are compared. (MOW)
A series of laboratory performance tests were conducted on an absorption cycle water chiller and heat pump. The part-load performance was compared to the full-load capacity and coefficient of performance. The causes of performance degradation with shorter...
An air conditioning system is described utilizing low temperature heating sources of the environment to maximize the heat coefficient of performance by conserving subterranean heat, atmospheric heat, solar heat, and auxiliary heat sources in combination with a ...
The presentations covered a wide range of subjects and included: heat engine driven heat pumps; free piston compressors; ground heat transfer and extraction and ground heat; absorption cycle heat pumps; process heat recovery; high ...
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 ...
The development of a heat-actuated air conditioner that can operate with the temperatures available from flat plate solar collectors and use air cooling for disposal of the waste heat was explored using the ammonia water absorption cycle. Results of initial tests of an experimental system that fabricated to provide ...
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 new selection criterion for solar powered dual absorption systems is presented, and a multidimensional definition for the coefficient of performance is suggested. The traditional definition, which does not define the heat input base, is found to create misleading results with respect to machine selection, causing the dual cycle to ...
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 ...
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 ...
In comparison with conventional absorption heat pump processes the solid and porous zeolite adsorber permits a simpler and a more advantageous procedure. The operation of a zeolite adsorption cycle is illustrated in Figure 1. The entire system consists of...
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 ...
A high-efficiency power cycle is proposed in which molecular hydrogen gas is used as a working fluid in a regenerative closed Brayton cycle. The hydrogen gas is compressed by an absorption-desorption cycle on metal hydride (FeTiHx) beds. Low-temperature solar or geothermal heat (temperature ...
Incentives for the development of gas heat pumps are discussed. Technical progress made on several promising technologies was reviewed. The status of development of gas-engine-driven heat pumps, the absorption cycle for the near- and long-term gas heat pump systems, the Stirling engine, the ...
An improvement in an absorption heat pump cycle is obtained by adding adiabatic absorption and desorption steps to the absorber and desorber of the system. The adiabatic processes make it possible to obtain the highest temperature in the absorber before any heat is removed from it and 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 ...
Advanced technologies for gas-fired absorption heat pumps for building space conditioning (heating and/or air conditioning) are being developed with the US Department of Energy support. Single- effect cycle absorption heat pumps for residential application were demonstrated ...
A description is presented of the possible uses of heat pumps for space and water heating applications in houses in the UK. In the UK the only heat pumps sold of a size suitable for domestic heating applications are compression cycle electrically driven devices. The feasibility of a use of ...
Heat pump systems for recovering waste heat are considered. To compare different cycles on a consistent basis, a definition of performance based on the Second Law of Thermodynamics is presented. A high-grade heat-actuated cycle that uses a steam ejector is analyzed, but no substantial ...
The absorption cycle offers one of the most economic and widely applicable technologies for waste heat upgrading. It can use off-the-shelf hardware that is available now, at any required capacity rating. Fractional distillations, as a class of applications, embody characteristics that inherently make them economic candidates for ...
E-print Network
The Thermal Cycling Absorption Process (TCAP) is used to separate isotopes of hydrogen. TCAP involves passing a stream of mixed hydrogen isotopes through palladium deposited on kieselguhr (Pd/k) while cycling the temperature of the Pd/k. Kieselguhr is a s...
A series of laboratory performance tests were conducted on an absorption cycle water chiller and heat pump. The part-load performance was compared to the full-load capacity and coefficient of performance. The causes of performance degradation with shorter operating times are speculated upon with partial substantiation resulting from ...
A series of laboratory performance tests were conducted on an absorption cycle water chiller and heat pump. The part-load performance was compared to the full-load capacity and coefficient of performance. The causes of performance degradation wih shorter operating times are speculated upon with partial substantiation resulting from ...
The objective of the program is research, development and demonstration of a double-effect generator cycle absorption heat pump for the residential and small commercial markets. During Phases II and IIA, a 3RT advanced breadboard air-to-air reverse cycle ...
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. ...
In this paper, the equivalent combined systems of three-heat-source heat pumps are studied. It is pointed out that there may be three combined ways for us to conceive a reversible three-heat-source heat pump as a combined system having a reversible Carnot heat pump driven by a reversible Carnot ...
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...
If residential solar heating and cooling is to be universally usable across the country, air-cooled solar air conditioners must be developed in addition to present water-cooled systems. Absorption cycles that are suitable for air-cooled operation with solar heat at temperatures ranging from below 200 F to close to ...
After a theoretical and technological review of the absorption cycle, utilization for heat recovery at low level (60-80 deg C) and at medium level (110-150 deg C) is examined. Comparison are made between two systems, heat carrier/absorbant: water/lithium ...
The RD&D program has resulted in design, development and testing of a packaged prototype double-effect generator cycle absorption gas heat pump for the residential and small commercial markets. The 3RT heat pump prototype has demonstrated a COPc of 0.82 a...
A computer simulation has been conducted to investigate the performance of an absorption heat pump, based on the Generator-Absorber Heat Exchange (GAX) cycle employing ammonia-water as the working fluid pair. The particular feature of this cycle is the ability to recover ...
Absorption heat pumps have received renewed and increasing attention in the past two decades. The rising cost of electricity has made the particular features of this heat-powered cycle attractive for both residential and industrial applications. Solar-powered absorption chillers, gas-fired ...
A second volume containing the appendices to the report on the development of high efficiency vapor compression cycle heat pumps for use in solar assisted heat pump (SAHP) systems is presented. A water source heat pump and a solar powered absorption chill...
In this report, Rankine-cycle heat pumps and absorption heat pumps (ammonia-water and lithium bromide-water) have been analyzed and optimized for a lunar base cooling load of 100 kW. For the Rankine cycle, a search of several commonly used commercial refr...
The Air Standard analysis for the internal regenerative Otto and Diesel cycles occurring within a single piston-cylinder geometry was investigated analytically. The use of a constant temperature internal regenerative reservoir permits the absorption of heat from the hot gases and rejection to the cooler charge later in the ...
A high-efficiency power cycle is proposed in which molecular hydrogen gas is used as a working fluid in a regenerative closed Brayton cycle. The hydrogen gas is compressed by an absorption-desorption cycle on metal hydride (FeTiH(x)) beds. Low-temperature solar or geothermal heat (temperature ...
PubMed
, GAX cycle, dual-fired generator, indirect fired generator, solar heating, absorption heat pump. #12;2.8, and heating COP's approaching 1.7. A solar fired heat pump could provide the space heating needs of a building a new dual-fired (gas-solar) ...
The objective is research, development and demonstration of a double-effect generator cycle absorption heat pump for the residential and small commerical markets. A 3RT advanced breadboard air-to-air reverse cycle heat pump was designed, fabricated and tested and the ...
Reconcentration of a lithium chloride solution in an open cycle absorption chiller can be accomplished by passing solar heated air through a packed column to which the dilute solution is supplied. Following a theoretical study of heat transfer and water vapor transfer rates in the column, experimental measurement ...
The performance of three combined absorption/vapor compression cycles for gas-fired internal combustion engine driven heat pumps was theoretically assessed. Two cycles were selected for the preliminary design of breadboard systems using only off-the-shelf components. The first cycle, based on ...
This investigation concerns the thermodynamic properties of LiBr/H/sub 2/O solutions relevant to absorption chillers and heat pumps. At the outset of the present study, efforts to quantify the thermodynamic performance of adsorption cycles were hindered by a lack of consistent enthalpy and entropy data on the ...
This activity is a classroom demonstration activity in which students make predictions and explore the concepts and applications of heat transfer and heat absorption.
NSDL National Science Digital Library
Pd/k is a hydride forming packing material which is used in the Thermal Cycling Absorption Process (TCAP). Palladium is supported on kieselguhr to create a packing material which will provide adequate void space to prevent excessive pressure drops and flo...
The possible use of solar energy powered absorption units to provide cooling and heating of residential buildings is studied. Both, the ammonia-water and the water-lithium bromide cycles, are considered. It is shown that the air cooled ammonia water unit ...
Improved performance of solar cooling systems using the lithium bromide water absorption cycle is investigated. Included are computer simulations of a solar-cooled house, analyses and measurements of heat transfer rates in absorption system components, and design and fabrication of various system components. 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 ...
The paper presents the results of an optimization study performed on the heat rejection system for a space based ORC power system using an isotope heat source. The radiator sizing depends on the heat rejection temperature, radiator configuration, and radiator properties such as the fin effectiveness, emissivity, and ...
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 ...
The purpose of the research was to determine if modified NaOH solutions could be used in absorption heat pumps (AHP) to provide higher heat pumping lifts from low ambient temperatures than are now possible. The research consisted of performing screening e...
Engineering alloys were analyzed in an effort to identify corrosion resistant materials for the absorption heat pump (AHP). Testing focused on the corrosion behavior of carbon steels and austentic stainless steels Types 304 and 316L. Most of the tests were conducted in lithium bromide solutions at various temperatures under non-flowing or static ...
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, absorption ...
A closed loop solar collector system includes a linear concentrating parabolic reflector, a linear vaporizer tube horizontally aligned along the focal line of the parabolic reflector, and a fluid metering assembly attached to the input end of the vaporizer tube for precisely metering a quantity of a vaporizable heat transfer fluid from a supply tank to the vaporizer tube. ...
Sundstrand Energy Systems was awarded a contract to investigate the performance capabilities of a toluene heater tube integral to a heat pipe as applied to the Organic Rankine Cycle (ORC) solar dynamic power system for the Space Station. This heat pipe is a subassembly of the heat receiver. The ...
... Accession Number : AD0276467. Title : MECHANICS OF HEAT PUMPS AND ABSORPTION REFRIGERATION: AN ANNOTATED BIBLIOGRAPHY. ...
... Title : HEAT CAPACITY BY THE RADIANT ENERGY ABSORPTION TECHNIQUE. Descriptive Note : Conference paper,. ...
The desorption and absorption process of a vapor compression heat pump with a solution circuit (VCHSC) proceeds at gliding temperature intervals, which can be adjusted over a wide range. In case that the gliding temperature intervals in the desorber and the absorber overlap, a modification of the VCHSC employing a desorber/absorber ...
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 ...
temperature of water in thermal storage tank. UA overall heat transfer coefficient. VM. Vuilleumier cycle. Greek Symbols. aYs solar absorptance ...
NASA Website
The unique ability of the alloy 55-Nitinol to be restored to a predetermined shape by moderate heating, and to exert considerable force during the shape-restoration, makes it attractive for certain mechanical systems. An important requisite to its utiliza...
Absorption heat pumps of the type analyzed here provide process heat from waste heat. A simulation model with optimization capability is now operational for an advanced sodium hydroxide-water absorption heat pump with a regenerative loop. In this type of ...
A thermal transfer cycle utilizing membrane osmotic transport of water against a pressure rise is investigated from the viewpoint of the operation of a conventional absorption heat pump using an aqueous solution as the working fluid. Physical sorption, similar or equivalent to condensation, of water vapor in the membrane material is ...
In this paper, life cycle cost analysis (LCCA) of waste heat operated vapour absorption air conditioning system (VARS) incorporated in a building cogeneration system is presented and discussed. The life cycle cost analysis (LCCA) based on present worth cost (PWC) method, which covers the initial costs, operating ...
Pd/k is a hydride forming packing material which is used in the Thermal Cycling Absorption Process (TCAP). Palladium is supported on kieselguhr to create a packing material which will provide adequate void space to prevent excessive pressure drops and flow restrictions. The use of unsupported palladium would result in blockage of columns and clogging of ...
The report describes the results of the first phase of effort in the development of the Battelle Absorption Heat Pump (BAHP). The BAHP is based on the dual-cycle concept which thermally links two conventional single-effect absorption cycles yielding a high-performance system without the need ...
... Accession Number : ADA539252. Title : Radial Distribution of Absorption in a Cesium Heat Pipe with Axial Laser Heating. ...
... in Shock Heated Propellant Mixtures for Laser-Heated Rocket Thrusters,. ... the temperature dependence of the absorption coefficient of water vapor at ...
A comprehensive survey of the current state of the absorption cooling technology has been conducted. This survey discusses the basic and applied absorption cooling/heating technology, analyses the current state of the art including the discussion of limitations and possible solutions, identifies areas where promising developments are ...
A high efficiency power cycle is proposed which uses H/sub 2/ gas as a working fluid in a regenerative closed Brayton cycle. The H/sub 2/ gas is compressed by an absorption/desorption cycle on metal hydride (FeTiH/sub x/) beds. Low temperature solar or geothermal heat (T approx. 100/sup 0/C) is ...
This article describes research to develop efficient gas-fired heat pumps heat and cool buildings without CFCs. Space heating and cooling use 46% of all energy consumed in US buildings. Air-conditioning is the single leading cause of peak demand for electricity and is a major user of chlorofluorocarbons (CFCs). Advanced energy ...
Basic tutorial article on the thermodynamic feasibility of laser engines at the present state of the art. Three main options are considered: (1) laser power applied externally to a heat reservoir (boiler approach); (2) internal heating of working fluid by resonance absorption; and (3) direct conversion of selective excitation into ...
The development of a high temperature solar thermal gas receiver using direct absorption of concentrated sunlight by a suspension of small carbon particles is described. The Small Particle Heat Exchange Receiver (SPHER) can be used to power a Brayton cycle engine, supply industrial process heat or ...
The operation of a heat pump is described. Heat pump operating principles, the Rankine refrigeration cycle and the heat pump systems based upon that cycle are explained. The actual performance of commercially available heat pumps and some of the development work being done ...
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 ...
Economic analysis of ordinary and evacuated tubular type flat-plate collectors have been carried out for operating absorption cycles with and without heat recovery absorber. Water-ammonia, NaSCN-NH{sub 3} and LiNO{sub 3}-NH{sub 3} have been selected as the working fluids in the cycles. Use of a ...
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 ...
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 overall objectives of this project are to evaluate, develop, and proof-test advanced absorption refrigeration cycles that are applicable to residential and commercial heat pumps for space conditioning. The heat pump system is to be direct-fired with natural gas and is to use absorption ...
A lithium bromide absorption refrigerating machine, using a water solution of lithium bromide as the
NASA Technical Reports Server (NTRS)
About ten minutes after reactor pneumatic tube irradiation (10 to 50 sec) of KBr samples, optical absorption and luminescence were studied during heating-cooling cycles. The induced radioactivity acting as an internal source of irradiation is found to play a dominant role and is responsible for some anomalous results. (auth)
The state-of-the-art of solar cooling is evaluated to determine the near term performance potentials and life-cycle costs of the most promising approaches. The heat actuated absorption cycle, Rankine cycle, and desiccant dehumidification cycle are examined. The principles ...
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 ...
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 ...
The science of thermodynamics, which arose in the 19th century, largely through the genius of Maxwell, directs that greater efficiency is achieved in heat engines with the use of high temperature and thus high grade heat input. Since then nearly all research dealing with heat engines has involved high temperature ...
A novel absorption process called Phase Transitional Absorption was invented. What is the Phase Transitional Absorption? Phase Transitional Absorption is a two or multi phase absorption system, CO{sub 2} rich phase and CO{sub 2} lean phase. During Absorption, CO{sub 2} is ...
Heat transformers are absorption heat pumps that boost the temperature of industrial waste heat. Solutions of lithium bromide-water are commonly employed in heat transformers. Although these solutions have many desirable properties, they exhibit a drawback - a narrow solution field because of ...
This courseware demonstrates the processes of a Carnot heat engine. It covers the four reversible steps in a carnot cycle.
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 ...
The cost effectiveness of Earth heat sinks for underground power plants operating in a closed cycle over limited durations in time was determined through a transient heat conduction analysis. A comparison of heat absorption capacity of Earth heat sinks per cubic foot ...
The unidirectional circulation of an enzyme round a working cycle can be understood in terms of the formation and decay of a soliton that acts as a ligand for the protein and for which the surrounding heat bath serves as a sink. An experimental confirmation of this interpretation is suggested in which the soliton is of the Davidov type and is created by ...
PubMed Central
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 bubble pump. ...
A second volume containing the appendices to the report on the development of high efficiency vapor compression cycle heat pumps for use in solar assisted heat pump (SAHP) systems is presented. A water source heat pump and a solar powered absorption chiller are studied for their feasibility in ...
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 address the application of the lithium ...
Computer Aided Design (CAD) has become a major design tool of mechanical engineers. Its use brings increased efficiency to the overall design process as well as reduces the product development time from conception to manufacturing. Computer Aided Thermal Analysis (CATA) is an attempt to develop concepts and ideas as well as computer software that will allow the computer aided analysis of thermal ...
A modular computer simulation program for absorption systems has been developed, which makes it possible to simulate various cycle configurations. The user supplies information about operating conditions, as well as characteristics of the various subunits and working fluids of the system. In addition, he conveys to the computer an image of the ...
A solar heating system including a flat plate solar collector having a heat absorber woven basket fashion across a riser grid system containing suitable flow medium for being heated by the solar radiation. A heat exchange column is coupled to the riser grid system for extracting the heat from ...
An experiment study was carried out in order to investigate feasibility of CO2-based Rankine cycle powered by solar energy. The proposed cycle is to achieve a cogeneration of heat and power, which consists of evacuated solar tube collectors, power generating turbine, heat recovery system, and feed pump. The Rankine ...
The technical feasibility of lithium chloride open cycle absorption air conditioner which utilizes solar heated air for reconcentration of the absorbent solution is examined. The use of a packed bed concentrator was described. Operating conditions for a 3-ton residential unit are determined from equilibrium data, conservation of mass ...
Reconcentration of a lithium chloride solution in an open-cycle absorption chiller can be accomplished by passing solar heated air through a packed column to which the dilute solution is supplied. Following a theoretical study of heat transfer and water vapor transfer rates in the column, experimental measurement ...
This report documents a study to determine alternatives for modernizing the central heating plant at the Defense Personnel Support Center (DPSC), Philadelphia, PA. The central heating plant contains five boilers; four are 50 years old and one is 14 years old. The age of this equipment warranted an investigation of alternatives for providing thermal energy ...
The fundamentals of heat transfer by conduction, convection, and radiation are summarized, including relevant equations, physical constants for various materials, and solved problems. Fundamental properties of solar radiation, particularly the qualities of radiation reaching the earth and its time dependence, are presented. Schematics are presented for two ...
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 refrigeration and ...
The objective is the demonstration of high performance, cost effective non-concentrating solar collectors using heat pipes. The end products will be directly applicable for efficient use with absorption and Rankine cycle chillers. Evacuated tubular solar ...
A two-dimensional analysis of steady laminar natural convection in an open ended parallel plate channel is presented for combined heat and mass transfer. Symmetric and asymmetric boundary conditions of uniform wall temperature and concentration (UWT/C) an...
The efficiency of an absorption heat pump system is improved by conducting liquid from a second stage evaporator thereof to an auxiliary heat exchanger positioned downstream of a primary heat exchanger in the desorber of the system.
... cylinder of aluminum which was machined to give a ... The classical absorption was subtracted ... in the section on specific heats, The characteristic ...
... Title : EFFECT OF VOLUMETRIC ABSORPTION COEFFICIENT ON ... Abstract : In calculating the temperature profile and heat transfer ...
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 ...
... Accession Number : AD0249972. Title : PARAMAGNETIC RESONANCE ABSORPTION IN HEAT-TREATED CARBON BLACKS. ...
... Accession Number : ADD120754. Title : Hydrogen Absorption of Titanium Heat Exchanger Tubes in MSF Desalination Plants,. ...
... Accession Number : AD0622797. Title : ABSORPTION COEFFICIENTS OF HEATED AIR: A COMPILATION TO 24,000 K. VOLUME I. ...
