A computer program has been written to rapidly and accurately produce a heat capacity/availability diagram. The diagram is developed from simple information describing hot and cold streams' temperature - heat capacity relations. Use of the program simplif...
National Technical Information Service (NTIS)
The heat capacity of beryllium as a function of temperature and the effect of impurities on the heat capacity are discussed. (auth)
Energy Citations Database
Relations were developed that allow easy and accurate calculation of enthalpy changes during the heating, retorting, or cooling of raw, spent, or burned Eastern oil shales. The heat capacities of the mineral matter, bound water, kerogen, and char, and the...
Formulas were derived for the specific heat capacity and the logarithmic temperature difference of heat exchangers in which the materials taking part in the heat transfer change their phase. They defined the processes accurately and allowed a simple evaluation of the research results. ...
Accurate values for the magnetocaloric effect can be obtained from both magnetization and heat-capacity data. A reliable estimate of the experimental errors in the calculated magnetocaloric effect can be made from the known experimental errors of the measured physical properties. Attempts in the past to simplify the basic thermodynamic relation to allow ...
In this note we present results for the heat capacity at constant pressure for the TIP4PQ/2005 model, as obtained from path-integral simulations. The model does a rather good job of describing both the heat capacity of ice Ih and of liquid water. Classical simulations using the TIP4P/2005, TIP3P, TIP4P, TIP4P-Ew, ...
NASA Astrophysics Data System (ADS)
Equations that predict the dependence of regenerator effectiveness on heat conduction in the matrix both parallel to and perpendicular to the fluid flow are derived from numerical simulations. The equations developed use Biot numbers parallel to the direction of fluid flow and perpendicular to the fluid flow direction, the ratio of heat ...
A rapid measurement technique to determine heat capacities, temperatures, and absorptivities of single submillimeter size (50--200 {mu}m diam) particles in an electrodynamic balance (EDB) is described. Accurate estimates of heat capacities and absorptivities are made for single carbon particles ...
A method for the non-contact measurement of the specific heat capacity, the enthalpy of fusion and thermal transport properties of electromagnetically levitated liquid metallic alloys is described. The method is based on the separation of heating and positioning fields, modulation of the inductive heating power ...
A computer program has been written to rapidly and accurately produce a heat capacity/availability diagram. The diagram is developed from simple information describing hot and cold streams' temperature - heat capacity relations. Use of the program simplifies the work required by a ...
Cerous magnesium nitrate (CMN) is the preeminent electronic paramagnet in use in cryogenic physics for magnetic thermometry and adiabatic cooling. In demagnetization experiments designed to establish the thermodynamic temperature relations for CMN, an inexplicable heat capacity anomaly was found to occur above 20 mK and is shown here to persist to ...
An experimental device for making isobaric heat capacity measurements of liquids under pressure is presented. The device is an adaptation of the Setaram micro-DSC II atmospheric-pressure microcalorimeter, including modifications of vessels and a pressure line allowing the pressure in the measurement system to be set, controlled, and stabilized. The high ...
Phase change materials (PCMs) are substances exhibiting phase transitions with large latent heats that can be used as thermal storage materials with a large energy storage capacity in a relatively narrow temperature range. In many practical applications the solid-liquid phase change is used. For applications accurate knowledge of ...
In this paper we demonstrate that the observed discrepancy between the measured and expected values of the heat capacity ratio ? = CP/CV for air obtained using the PASCO Adiabatic Gas Law Apparatus1 is due primarily to the finite compression time in the experiment. We devised an empirical method for obtaining a more accurate value of ? ...
... SABSTRACT: The heat capacities of carbonates of cobalt, nickel, manganese, iron ... the first four compounds the maximum heat capacity is observed ...
DTIC Science & Technology
The objective of this study was to derive a general mathematical model for heat and moisture transfer in rock beds. The solution of this model required information about the sorptive capabilities of the limestone rocks. Since sorption is temperature dependent, it was evaluated at 2, 23, and 35. The heat of sorption was evaluated and found to be identical ...
One of the difficulties in the solution of inverse heat conduction problems is that of making sufficiently accurate initial guesses for the unknowns in order to start the iterations. In this paper a direct integration method is developed for determining good initial guesses for the unknown property coefficients within about 10% error. The ...
Heat Capacity and Latent Heat Objective The objective of this laboratory is for you to explore the heat capacity of materials due to atomic vibrations and the latent heat of phase, dataacquisition software, plotting and analysis software Introduction Knowledge of the ...
E-print Network
The first in a series of low cost Atmospheric Explorer Satellites, the Heat Capacity Mapping Mission
NASA Technical Reports Server (NTRS)
... Title : STANDARD HEAT CAPACITIES, ENTROPIES, AND ENTHALPIES OF SILICON, CHROMIUM, AND CHROMIUM SILICIDES. ...
The Tasman Front was delineated by airborne expendable bathythermograph survey; and an Heat Capacity
... HIGH TEMPERATURE HEAT CAPACITY EQUATIONS Vol AND THERMODYNAMIC PROPERTIES OF COMBUSTION GASES By ...
... Title : HIGH TEMPERATURE HEAT CAPACITY EQUATIONS AND THERMODYNAMIC PROPERTIES OF COMBUSTION GASES. ...
... HEAT CAPACITY DETERMINATION OF MINERAL AND SYNTHETIC ENGINE OILS, LUBRICANTS, FUELS, AND HYDRAULIC FLUIDS IN THE ...
... Title : HEAT CAPACITY BY THE RADIANT ENERGY ABSORPTION TECHNIQUE. Descriptive Note : Conference paper,. ...
... Title : EXPERIMENTAL INVESTIGATION OF HEAT CAPACITY OF WATER AND WATER VAPOR AT TEMPERATURES FROM 50 TO 450 ...
... decrease of detonation susceptibility and detonation capacity is ... Descriptors : (*EXPLOSIVES, *DETONATIONS), HEAT RESISTANT MATERIALS ...
... Title : Determination of the Kinetics of Curing and the Heat Capacity of an Epoxy Resin by Differential Scanning Calorimetry,. ...
... Title : Determination of the Kinetics of Curing and the Heat Capacity of An Epoxy Resin by Differential Scanning Calorimetry,. ...
The heat generated from the radioactive waste to be placed in the proposed geologic repository at Yucca Mountain, Nevada, will affect the thermal-hydrology of the Yucca Mountain stratigraphic layers. In order to assess the effect of the movement of repository heat into the fractured rocks accurate determination of thermodynamic and ...
DOE Information Bridge
This paper presents the results of a project to develop a simple and accurate predictive algorithm for heat pump heating efficiency. Field test data are gathered. Cycling losses are then predicted by means of a model. Laboratory tests were performed to evaluate the capacity and power transients during startup, and ...
... Title : Heating Capacity Limitations of Extruder Screws,. ... Abstract : The ultimate output capacity of the single screw extruder is a function of many ...
... The selected values of heat contents and heat capacities are listed in Table 1I. ... Experimentally Determined Heat Capacity Data for Liquid Bismuth ...
... k is the ratio of heat capacities for the ... ex- plosion, of temperature on heat capacity, and more ... item usually encountered- the enthalpy ("heat content ...
Charts of transient heat conduction in a cylinder of infinite length, an infinite flat plate, and a sphere are presented for a range of Biot numbers relevant to problems involving natural convection cooling. The conclusions show that the temperature gradient increases as the Biot number decreases, and that the simplified lumped capacity analysis becomes ...
Relations were developed that allow easy and accurate calculation of enthalpy changes during the heating, retorting, or cooling of raw, spent, or burned Eastern oil shales. The heat capacities of the mineral matter, bound water, kerogen, and char, and the heat of mineral dehydration are given ...
A flow microcalorimeter designed to measure the heat capacity of fluids at temperatures to 573 K and pressures to 1 kbar is described. this instrument is a reconstructionof the device used earlier in this laboratory to measure the Na/sub 2/SO/sub 4/(aq) heat capacity. The new instrument includes several ...
An estimation method was developed to predict ideal gas heat capacities over the temperature range from 300 to 1500 K. The only information required are the types and numbers of different elements comprising a molecule. This method gives numeric results only slightly inferior to more rigorous methods and has the advantage of being general in the sense that ...
We explored the optimum conditions in modulation of the program temperature and sample preparation to obtain absolute values of heat capac- ity from quasi-isothermal measurements of temperature-modulated differen- tial scanning calorimetry. A Mettler-Toledo 820 calorimeter and Perkin-Elmer DSC 7 were used for this work, using saw-tooth modulation as ...
We present a new type of calorimeter in which we couple an unknown heat capacity with the aid of Peltier elements to an electrical circuit. The use of an electrical inductance and an amplifier in the circuit allows us to achieve autonomous oscillations, and the measurement of the corresponding resonance frequency makes it possible to ...
An experiment to measure the exchange heat capacity of solid /sup 3/He is described. The exchange heat capacity was measured in terms of the Zeeman heat capacity by r-f heating of the exchange bath and measuring the accompanying temperature rise. ...
Procedures developed in the NBS-Boulder Laboratory for heat capacity measurements of solids have been adapted successfully for the determination of liquid heat capacities. Heptane was used as a standard in the measurement of the heat capacity of three jet...
ET , and the specific heat capacity , CP, of the undercooked liquid and throughout the glass ... Using specific heat capacity data obtained by DSC ...
NASA Website
indicate an enhancement of the heat capacity that varies as a function of Q ... depressed that superflow will become unstable, and the heat capacity will ...
The heat capacity of some molten alkali metals was studied. Heat capacities for liquid Rb and Cs up to 800 deg C were calculated by the method of thermodynamic similarity. (auth)
... 1. There has recently been a revival of interest in the heat capacities of crystalline and amorphous polymers. From heat capacity, CV, data ...
Earthnet Programme Office Heat Capacity Mapping Mission (HCMM) Data, ESA/ESRIN ... Abstract: The Heat Capacity Mapping Radiometer (HCMR) provide visible and ...
The Lukens Conshohocken plant started operations in 1979 without any heat treating facility. In 1982, an 85-ft Drever furnace was placed in operation. This furnace was originally installed by Allen Wood Steel in the early 1950`s. Heat treating at the Drever furnace included normalizing, tempering, stress relieving and annealing as well as hot leveling, ...
The author has developed a new method for determining the heat capacity of pure gas hydrates. This method circumvents both of the major problems which arise in the measurement of high pressure gas hydrate heat capacity. These problems are, (1) the inability to create a perfect hydrate sample and (2) the effect of ...
The enthalpy of a fluid measured with respect to some reference temperature and pressure (enthalpy increment or Cp) is required for many engineering designs. Different techniques for determining enthalpy increments include direct measurement, integration of heat capacity as a function of temperature at constant pressure, and calculation from ...
We have measured the heat capacity and thermal conductivity of films of granular Al-Ge. There is no evidence for a change in the electronic specific heat capacity, but the lattice heat capacity is much greater than that of the constituents. The superconducting transitions ...
... (Author). Descriptors : , HYDRATES, ENTROPY, HEAT OF FUSION, HEAT OF FORMATION, MELTING, EXPERIMENTAL DATA, SPECIFIC HEAT. ...
... Accession Number : AD0748733. Title : The Enthalpy and Heat Capacity of Barium Aluminate at High Temperatures,. Corporate ...
... Title : Simultaneous Measurements of Heat Capacity, Thermal Conductivity, and Thermal Diffusivity of ... Corporate Author : RESERVED SOURCE. ...
... Accession Number : ADD147399. Title : Phonon Dispersion and Heat Capacity of Scandium. Descriptive Note : Journal article,. ...
... a dilute solution the heat capacities (at constant ... They also obtained enthalpy data on the ... Reintroduction of the heat capacity term expands equation ...
Low temperature heat capacities of superconducting niobium and tantalum carbides measured for carbon
... Accession Number : ADA111394. Title : Heat Capacity of Water at Extremes of Supercooling and Superheating. Descriptive Note : Technical rept.,. ...
... Accession Number : AD0747583. Title : Heat Capacity of Titanium Boride,. Corporate Author : FOREIGN TECHNOLOGY ...
... Title : Heat Capacity and Thermal Conductivity of a Glass Sample: A Comparison With a Theoretical Model. Descriptive Note : Journal article,. ...
... V. Polystyrene,. ... A set of recommended data for amorphous polystyrene is derived. The effect of tacticity on the heat capacity is also evaluated. ...
... Accession Number : ADD095182. Title : Heat Capacity and Other Thermodynamic Properties of Linear Macromolecules. IV. Polypropylene,. ...
... Accession Number : ADD095181. Title : Heat Capacity and Other Thermodynamic Properties of Linear Macromolecules. III. Polyoxides,. ...
... Title : HEAT CAPACITY AND THERMAL EXPANSION OF SILICON ALLOYS CONTAINING IRON, CHROMIUM, AND ... Report Date : 1957. ...
... Accession Number : AD0743339. Title : Enthalpy and Heat Capacity of Strontium Aluminate at High Temperatures,. Corporate ...
... Accession Number : AD0743338. Title : Enthalpy and Heat Capacity of Quenched and Annealed Zinc Ferrites,. Corporate ...
The apparent molar heat capacity of aqueous HCl has been measured at temperatures of 25, 76, 103, 125 and 140 C and molalities from 0.1 to 1.02 mol-kg/sup -1/ using a Picker flow microcalorimeter. The results were analyzed using the Pitzer and the Helgeson-Kirkhan-Flowers models to derive standard state heat ...
Hydrophobic hydration is studied with an information theory approximation, using the first two moments of the number of solvent centers in a cavity in liquid water, calculated from the density and the pair correlation function. The excess chemical potential, entropy, and heat capacity of solvation are determined for three cases: the two-dimensional MB ...
The need for highly accurate thermal property data for a broad range of new application fluids is well documented. To facilitate expansion of the current thermophysical database, an automated flow calorimeter was developed for the measurement of highly accurate isobaric heat capacities and enthalpies of fluids at ...
