The paper, in very concise way, shows the results of a research and development activity in the field of absorption heat pumps carried on by ENEA together with the Italian firm NET. The activity was aimed to the construction and testing of a new water-ammonia machine for both chilling and heating purposes in the tertiary sector. The experimental performance data of the first 11 kW chilling machine are compared to those of the R22 compression machines in terms of COP, Primary Energy Ratio and TEWI.
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