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280 R. M. Lazzarin Air Figure 22. Accumulator Compressor Air to water motor driven heat pump (doc. Sanyo). Exhaust Fan the motor (Fig. 22). Finally the noise is comparable to a common boiler (55 dB(A) at 1 m). Some data can suggest the possible PER obtainable: a small capacity model gives 26.5 kW heat with a natural gas demand of 19.4 kW (LHV) and electric power of 0.7 kW for the auxiliaries. PER is then 1.32. The same device can operate as an air conditioner with a cooling effect of 22.4 kW (gas input 17.8 kW) with a cooling PER of 1.21. Absorption heat pumps are the other group of gas driven heat pumps. Till now the absorption machine has been used above all as an air conditioner, though its operation is more suitable to heat pump mode. In fact even if only a block diagram of the cycle is considered (Fig. 23), it is easy to perceive that the energy taken from the evaporator can produce a useful effect during absorption. The energy cost is essentially a heat supply to the generator to separate the refrigerant from the solution. A second useful effect is then obtainable at the condenser, so that a PER of 2 could be theoretically obtained. Technically achieved PERs are of about 1.3–1.4, that is as high as in motor driven heat pumps. The advantage of the absorption heat pump lies in the few moving parts, then in its reliable and silent operation. Moreover, according to the thermal balance just presented, the thermal request to the heat pump Downloaded from https://academic.oup.com/ijlct/article/2/3/262/758006 by guest on 21 June 2022 International Journal of Low Carbon Technologies 2/3PDF Image | Technological innovations in heat pump systems
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