Small cooling capicity hybrid refrigeration system using R723

在过去的二十年里，对氟氯化碳、氟氯烃或二氧化碳排放对环境的影响，特别是对臭氧层和全球变暖现象的影响的担忧，重新激发了人们对将吸附技术应用于热泵和制冷系统的兴趣。这主要有两个原因：所使用的制冷剂(氨、水或酒精)对环境的危害较小(零全球变暖潜势(GWP)和零臭氧消耗潜势(ODP))以及系统是热驱动的，因此可以使用“免费”或低成本的热源，如太阳能、生物质或废热(家用或工业)。随着欧盟旨在执行《京都议定书》的法规，以及全球主要能源(石油和天然气)成本的上升，需要环境友好和高效的热泵和制冷系统。本项目提出了一种混合制冷系统，它使用与传统制冷铜合金(CuNi10)兼容的环保制冷剂R723(共沸混合物：40%二甲醚和60%氨)。它是一个由双源(热源和/或电)驱动的联合吸附-蒸汽压缩制冷系统。这种制冷剂在吸附循环中的使用和混合能源都是关键的创新。大量的混合制冷系统布局将与系统控制策略的发展相关联地进行建模。将设计、制造一台10千瓦制冷量的概念验证样机，并对其性能(COP和制冷功率)进行评估。

In the past two decades, concern about the impact of CFCs, HCFCs or CO2 emissions on the environment and in particular on the ozone layer and global warming phenomena has reactivated interest in Sorption Technology applied to heat pumps and refrigerating systems. This is for two main reasons: the refrigerants used (ammonia, water or alcohols) are less harmful to the environment (zero Global Warming Potential - GWP and zero Ozone Depletion Potential - ODP) and the systems are heat driven therefore could use 'free' or low cost heat sources such as solar energy, biomass or waste heat (domestic or industrial). With EU regulations aimed at enforcing the Kyoto Protocol and the rising cost of the primary sources of energy (Oil and Gas) worldwide, the need for environmentally friendly and highly efficient heat pumps and refrigerating systems is required. The current project proposes a Hybrid Refrigeration System using the environmentally friendly refrigerant R723 (azeotropic mixture: 40% DME and 60% Ammonia) that is compatible with conventional refrigeration copper alloy (CuNi10) It is a Combined Sorption-Vapour Compression Refrigeration System driven by a dual source (heat and/or electricity). Both the use of this refrigerant in an adsorption cycle and the hybrid energy source are key novelties.Numerous Hybrid Refrigeration System layouts are to be modeled in association with the development of system control strategy. A proof of concept prototype of 10 kW cooling capacity will be designed, built and its performance (COP and cooling power) evaluated.