Numerical and experimental study of an ejector as an expansion device in split-type air conditioner for energy savings

Sumeru, Kasni; Shodiya, S.; Nasution, Henry; Ani, Farid Nasir

doi:10.1016/j.enbuild.2014.04.043

Cited by 33 publications

(22 citation statements)

References 18 publications

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“…The type of refrigerant also influences the performance of the AAC system; thus, a few studies have reported the effect of alternative refrigerants on the performance of the AAC system as a replacement for HFC-134a (Steven Brown et al 2002;Tamura et al 2005;Wongwises et al 2006;Cho et al 2013;Han et al 2013;Qi 2013;Fig. 14 Variation of input power (W input ) and input power reduction (W input_red ) with ambient temperatures (Sumeru et al 2014) Fig. 15 Variation of COP and COP improvement with ambient temperatures (Sumeru et al 2014) Energy Efficiency Wu et al 2014;Li et al 2014b).…”

Section: Electronic Expansion Valvementioning

confidence: 97%

“…According to Fig. 9, using the ejector also reduces the quality of the refrigerant entering the evaporator (P7 for SEC and P8 for MEC), thereby producing a higher cooling capacity (Sumeru et al 2014) compared with SC. The reason is the overall heat transfer coefficient of the evaporator in the system with ejector is higher than that of the SC system under the same area of the evaporator.…”

Section: Ejector As An Expansion Devicementioning

confidence: 98%

“…Ejectors improve refrigeration cycle performance because of their ability to reduce throttling losses and increase the efficiency of stationary and AAC systems (Sumeru et al 2012(Sumeru et al , 2014. Three applications of an ejector on the VCR cycle were highlighted by Sumeru et al (2012): ejector on the heat-driven refrigeration, ejector on the condenser, and ejector as an expansion valve.…”

Section: Ejector As An Expansion Devicementioning

confidence: 99%

“…As a result, the evaporator cooling capacity decreased, which subsequently reduces the system performance. However, the ejector generates an isentropic (constant entropy) process (Sumeru et al 2014) with no entropy generation. Thus, energy loss during the throttling process is reduced.…”

Section: Ejector As An Expansion Devicementioning

confidence: 99%

“…The entrainment ratio is the ratio of the mass flow rate in the suction nozzle to the motive nozzle of the ejector (Lee et al 2014). Sumeru et al (2014) also conducted an experimental investigation on the effect of the ejector as an expansion valve to the performance of an A/C system. As shown in Fig. 14, the researchers found that at a constant ambient temperature, the MEC A/C system of a split-type air conditioner always consumed a lower compressor input power compared with a SC A/C system using the conventional expansion valve.…”

Section: Ejector As An Expansion Devicementioning

confidence: 99%

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Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

et al. 2015

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This article presents a review of potential technologies and strategies to develop an energyefficient automotive air-conditioner based on the vapor-compression refrigeration cycle system. This paper is broadly divided into two sections. The first is a review of component optimization (primary and secondary components) that enhances the energy efficiency of the automotive air-conditioning (AAC) system. The second presents a review of operational management and control that efficiently consumes energy in operating the AAC system while maintaining vehicular thermal comfort satisfaction. Some of the technologies and strategies described in this article are still conceptual and are the subject of ongoing research. However, the growing demand to reduce energy consumption by developing a new AAC system has led to an increasing number of related studies aimed at generating alternative conventional systems in the near future. Keywords Automotive air-conditioning system . Efficient component . Energy efficiency improvement . Operational management Nomenclature A/C Air-conditioning AAC Automotive air-conditioning CRC Conventional refrigerant cycle DEAC Dual-evaporator air-conditioning DX Direct expansion EEV Electronic expansion valve EV Electric vehicle EVDC Externally controlled variable capacity compressor FCC Fixed capacity compressor FDC Fixed displacement compressor FSTPID Fuzzy self-tuning proportional integral derivative HVAC Heating, ventilation, and air conditioning MEC Modified ejector cycle RV Revolving vane SC Standard cycle SEC Standard ejector cycle TEV Thermostatic expansion valve TPERC Two-phase ejector refrigerant cycle VAV Variable air volume VCC Variable capacity compressor VCR Vapor compression refrigeration Energy Efficiency

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