Enhancing the sustainability of Chiller systems against annual temperature rise: A review

Document Type : Review Article

Authors

1 Mechanical Power Engineering Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt

2 Mechanical Engineering Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt

Abstract

Global warming which is accompanied by annual temperature rise represents a significant challenge reaching various majors, Air conditioning systems were no exception but two relatively opposite demands are often assessed which are; improving the indoor conditions and reducing the energy consumption. The commercial and practical data for the systems shows a dramatic decrease in the coefficient of performance against ambient temperature rise, which in turn decreases the efficiency of the cooling plant year after year resulting in an insufficient cooling at some point for the existing systems. Also, the sustainability of these systems decreases due to the side effects of the climate change which results in more extreme load periods, intense solar heat flux and higher temperature differences, So, This review presents thermal load increment according to past, present and future climate data for active cooling systems, listing their energy consumption for different climate zones, discusses the major countermeasures for climate change adaptation, and introducing the currently developed approaches for enhancing COP of air conditioning systems for various components. From this review it can be concluded that the main drawbacks in the previous enhancements are either the over complexity of the system, decreasing the thermal efficiency against increasing the COP when implementing additional thermal components of renewable energies, or the over-space needed for the systems which is not suitable with the system size and finally the common issue is that the enhancement is limited to finite system size range and specific environmental conditions.

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