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2.1.3.2 Concluding Remarks It can be observed that the use of heat for cooling operation is technically feasible. The economic viability of such systems when compared with other cooling applications depends mainly on the value of the heat source (i.e. whether it is free or not) (Henning, 2005). AC is still the dominating technology for thermally-driven chillers. About 59% of installed thermally-driven cooling applications in Europe use AC (Henning, 2005). They are available on the market in a wide range of capacities and are usually designed for different applications (see Table 2-4). The basic cycle, where for each unit mass of refrigerant which evaporates in the evaporator one unit mass of refrigerant has to be desorbed from the refrigerant-sorbent solution, is known as the single-effect cycle. Such cycles usually operate in the temperature range of 80–100 oC and achieve a COP of about 0.7. Other effects adapted from the basic single-effect system such as half, double, triple and multiple-effect systems are also applicable; however, some of them have not been implemented commercially (e.g. triple and multiple-effect systems). An ORC-driven VCR system has been shown to have a better second law efficiency than an AR system for a given waste heat source (Aneke et al., 2012a). Apart from that, the ORC part of the ORC-driven VCR system may also be used for power generation when there is no need for a cooling application, thus having more operational time, which gives rise to a greater return on investment, unlike the AR system which can only be used for 77PDF Image | Northumbria Research Link
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