A perennial problem with waste heat is the capital cost of plant required to make its utilisation
justifiable. A good example of this is the use of waste heat to power absorption refrigerators. The
capital cost of absorption refrigerators rises sharply as the temperature of the heat source falls,
making waste heat recovery and use uneconomic. An example of this is the problem of utilising
the vast quantities of low temperature waste heat generated by municipal incinerators during
summer months. During the winter this heat can be sold to warm offices, homes, public buildings
and so on, through a district heating company. However, during the summer vast quantities of heat
generated by incineration are wasted to the environment because of the prohibitively high cost of
absorption refrigerators, which can be twice that of conventional electrically-powered vapour
compression systems, that could convert some of the waste heat into useful refrigeration for
building cooling. This paper addresses how this wasted heat could be directed in an energy efficient
and environmentally-beneficial way to provide refrigeration. The paper describes and evaluates the
results of an experimental study undertaken to assess the potential application of low capital cost
refrigerators designed on the jet-pump principle powered by waste heat. Water was selected as the
refrigerant for the experimental refrigerator. There has been little published research on steam
jet-pump refrigeration in recent years. Most published work has concentrated on the use of
halocarbon refrigerants. Because of the harmful environmental effects of these compounds and the
growing interest in utilizing waste heat, it was felt to be an opportune time to investigate the
potential of low-temperature, steam-powered, jet-pump refrigeration systems. It is hoped that this
contribution will encourage debate in this important area of research.
THE JET-PUMP REFRIGERATOR CYCLE
A perennial problem with waste heat is the capital cost of plant required to make its utilisationjustifiable. A good example of this is the use of waste heat to power absorption refrigerators. Thecapital cost of absorption refrigerators rises sharply as the temperature of the heat source falls,making waste heat recovery and use uneconomic. An example of this is the problem of utilisingthe vast quantities of low temperature waste heat generated by municipal incinerators duringsummer months. During the winter this heat can be sold to warm offices, homes, public buildingsand so on, through a district heating company. However, during the summer vast quantities of heatgenerated by incineration are wasted to the environment because of the prohibitively high cost ofabsorption refrigerators, which can be twice that of conventional electrically-powered vapourcompression systems, that could convert some of the waste heat into useful refrigeration forbuilding cooling. This paper addresses how this wasted heat could be directed in an energy efficientand environmentally-beneficial way to provide refrigeration. The paper describes and evaluates theresults of an experimental study undertaken to assess the potential application of low capital costrefrigerators designed on the jet-pump principle powered by waste heat. Water was selected as therefrigerant for the experimental refrigerator. There has been little published research on steamjet-pump refrigeration in recent years. Most published work has concentrated on the use ofhalocarbon refrigerants. Because of the harmful environmental effects of these compounds and thegrowing interest in utilizing waste heat, it was felt to be an opportune time to investigate thepotential of low-temperature, steam-powered, jet-pump refrigeration systems. It is hoped that thiscontribution will encourage debate in this important area of research.THE JET-PUMP REFRIGERATOR CYCLE
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