Showing 1 - 9 of 9
Various methods of capacity modulation of electric motor driven heat pumps have been reviewed with a particular emphasis on variable-speed motors. The effect on the steady-state performance of the heat pump, of variation in the externally-controllable independent parameters, while the compressor...
Persistent link: https://www.econbiz.de/10008913468
The mathematical models of the individual components of the heat-pump system presented in Part II have been translated into computer programs. The structures of these for steady- and dynamic-state simulation are presented. The results of the simulation have been compared with some experimentally...
Persistent link: https://www.econbiz.de/10008913714
The design sequence of a heat pump is described. Various design aspects of a heat pump are discussed with reference to individual components of the system. Some of the common refrigerants have been theoretically analysed for their suitability as heat pump working fluids. Rankine coefficients of...
Persistent link: https://www.econbiz.de/10008916526
Various mathematical models on mechanical vapour-compression heat pumps since 1975 have been reviewed with particular emphasis on their bases and end uses. These models have been classified according to steady- and dynamicstate simulations.
Persistent link: https://www.econbiz.de/10008916326
HFC134a has been identified as an alternative to CFC12 for refrigeration applications. Significant progress has been made in the use of HFC134a for refrigeration. This paper analyses the suitability of HFC134a along with those of HCFC22, HCFC124, HFC134, HCFC142b and HFC152a as alternatives to...
Persistent link: https://www.econbiz.de/10008913358
The free choice of operating temperatures in absorption systems is limited by the Gibbs phase rule and thermodynamic properties of the working pair. For a given combination of temperatures, the concentrations in the absorber and the generator for a given working pair are fixed automatically....
Persistent link: https://www.econbiz.de/10008913951
The free choice of operating temperatures in absorption systems is limited by the Gibbs phase rule and the thermodynamic properties of the working pair. Tables of possible combinations of operating temperatures and concentrations, including flow ratios, Carnot coefficients of performance and...
Persistent link: https://www.econbiz.de/10008916182
This paper describes a mathematical model of a solar regenerator, which could be used in either an open-cycle desiccant-cooling system or an open-cycle absorption-cooling system. The model has been validated by experimental data from the published literature. The effects of the variation of the...
Persistent link: https://www.econbiz.de/10008917018
The free choice of operating temperatures in absorption systems is limited by the Gibbs phase rule and the thermodynamic properties of the working pair. Tables of possible combinations of operating temperatures and concentrations, including flow ratios, Carnot coefficients of performance and...
Persistent link: https://www.econbiz.de/10008919488