Overview
ABSTRACT
Refrigeration and heat boosting are typical applications of reverse cycle machines or systems. The need to save energy means carefully considering all that can be done using the potential of reverse cycle machines. This article reports on the state of the art regarding fundamental knowledge of reverse cycle machines to develop consistent models. The first reported approach is the classical one, based on equilibrium thermodynamics. The second one is more recent, and uses full thermodynamics combining heat and mass transfers. Some simple examples are given to illustrate the usefulness of the concepts introduced. These concepts will probably be considered more deeply in the near future to optimise the design of machines, and to control, command, and run them on site.
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Michel FEIDT : Professor, University of Lorraine, Nancy, France
INTRODUCTION
The energetics section has two main headings, depending on the useful effect under consideration:
power generation ;
cold production or heat recovery.
In this second case, all the cycles used can be described as (as opposed to motor or direct cycles).
Here, we consider the general principles associated with reverse-cycle machines. The first approach described, which is very classical, uses the thermostatic.
We then show how to link the previous approaches to the thermokinetics, to build a genuine thermodynamics of reverse-cycle machines. The application of the above concepts is illustrated for the most common machine configurations.
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KEYWORDS
heat pumps | refrigerator | hot and cold heat recovery | thermodynamics of reverse cycle machines
Refrigeration and Heat boosting general principles
Thermostatic control of reverse cycle machines
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