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Buildings 2020+. EnErgy sourcEs elements and cause harm to human tissue. They are particularly damaging to the respiratory system. Simple refrigerants (CFCs) include R-11, R -12, R -113, R -114, R -115, R-500, R-502, and R-503. R-500, R-502, and R-503. Simple refrigerants (CFCs) are thought to be one of the main reasons for ozone depletion. According to the international agreement, since 1995 they have not been produced, but they are still used in the existing units. Due to laws forbidding the release of CFCs to the atmosphere, the new agent has been developed. These are used to recover, recycle and reclaim the refrigerants containing (CFCs). Hydrochlorofluorocarbons (HCFCs) refrigerants. These are molecules that consist of methane or ethane together with halogens. They form a new molecule that is considered partially halogenated. HCFCs refrigerants have shorter lives and cause less ozone depletion than the fully halogenated (CFCs). For this reason, they have reduced impact on the global warming (Althouse, 2013). 5.10. THE ABSORPTION SYSTEMS 5.10.1. Introduction The absorption system uses heat energy, not mechanical energy. This heat energy is used to create necessary conditions for the cooling cycle completion. Compression systems use a compressor and a refrigerant to create a heat pump cycle. Absorption heat pump uses a chemical process to change low-temperature vapour into a high- pressure vapour. Most of the vapour compression systems used chlorofluorocarbon refrigerants whose use is now limited due to ozone depletion (Hadorn, 2015). The most commonly used refrigerants for absorption systems are ammonia/water or lithium bromide/water, in which case the absorption system is better. In order to encourage the use of absorption systems, it is necessary to improve their performance and reduce costs. The absorption system can use different sorts of heat sources. The condenser, expansion valve and evaporator are similar to the compression system. The compressor is replaced by a generator and an absorber. 168PDF Image | Heat Pumps 978-83-65596-73-4
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