Development of refrigeration and heat pump systems

Generalized Performance Characteristics of Refrigeration and Heat Pump Systems

A finite-time generic model to describe the behavior of real refrigeration systems is discussed. The model accounts for finite heat transfer rates, heat leaks, and friction as different sources of dissipation. The performance characteristics are cast in terms of cooling rate (r) versus coefficient of performance (w). For comparison purposes, various types of refrigeration/heat pump systems are ...

Performance evaluation of irreversible cascaded refrigeration and heat pump cycles

This communication presents finite time thermodynamic optimization of irreversible cascaded refrigeration and heat pump cycles having source/sink thermal reservoirs of finite heat capacitance. A general expression for the optimum coefficient of performance of the refrigerator/heat pump is derived at minimum power input and given cooling/heating load conditions, respectively. External irreversib...

Stochastic (Probabilistic) Simulation for Design and Analysis of Vapor Compression Refrigeration/Heat Pump Systems

Hector L. Chavez Texas A&M University college Station, Texas This paper describes the use of stochastic (probabilistic) simulation for design and analysis of vapor compression refrigeration; heat pump systems. stochastic input variables: the condenser and the evaporator inlet temperatures, the degree of superheat at evaporator exit, the degree of subcool at condenser exit, the quality of the wo...

Waste Heat Recapture from Supermarket Refrigeration Systems

Past, present and future perspectives of refrigerants in air-conditioning, refrigeration and heat pump applications

The paper presents a study of refrigerants and some issues relating to their environmental impacts in HVAC&R equipment. They are treated aspects of the environmental pollution through the working fluids of the air-conditioning, refrigeration and heat pump systems, and a new strategy in using refrigerants in accordance with the international legislation is described. Additionally, this study pre...