Influence of electronic expansion valve on the performance of small window air conditioner retrofitted with R407C and R290

Chinnaraj, Chennuchetty; Govindarajan, P.; Vijayan, R.

doi:10.2298/tsci100629081c

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Chinnaraj et al [76] experimented with R407C and R290 in a 3.5 kW window air conditioner. It has been reported that the electronic expansion valve shows good overall performances comparing the capillary tube system.…”

Section: Based On Changes In Components Of the Systemmentioning

confidence: 99%

Alternative Refrigerants for HCFC 22—a Review

Kalla¹

2018

Journal of Thermal Engineering

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The aim of this paper is to determine the best available alternative which could replace existing refrigerant R22, with minimum or no changes in the air conditioning system. For this purpose, both the theoretical as well as experimental studies done in this area of research have been reviewed. The most popular HFC, R410A is having lower critical temperature, which restricts its usage in compression based systems working at higher condensing temperatures whereas for R407C, a change to synthetic lubricant is required and HC-290 is flammable. It is suggested that until the safety issue of use of hydrocarbon refrigerants in quantities exceeding 500gm is resolved, we should go for those mixtures of HFCs and HCs for which TEWI index is the lowest.

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Section: Based On Changes In Components Of the Systemmentioning

confidence: 99%

Alternative Refrigerants for HCFC 22—a Review

Kalla¹

2018

Journal of Thermal Engineering

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“…In order to increase the efficiency of the air conditioning system, several concepts have been studied, such as free cooling 17,18 and free cooling coupled with heat storage systems; 19 night ventilation; 20 using evaporative cooling; 21–23 coupling the buildings with earth heat exchangers; 22,24,25 employing chillers with: two compressors, 26 variable-speed compressor, 27 electronic expansion valve, 27,28 variable refrigerant flow systems, 24,29,30 or with new refrigerants; 31 using absorption or adsorption chillers, either driven by solar energy 32–34 or waste heat; 35,36 replacement of dry cooling towers by evaporative cooling towers; 37–39 improvement of control systems; 40–44 improvement of chiller condensation using swimming pools as heat links, 45 or even using aquifers as thermal storage. 46 In a recent review work, 47 different aspects that contribute to the energy efficiency on air conditioning systems were analyzed: novel cooling devices, innovative system designs and integration, and operational management and control.…”

Section: Introductionmentioning

confidence: 99%

Improving the efficiency of an air conditioning system using a fire water tank as thermal accumulator

Estébanez

Ortiz

Pérez

et al. 2014

Building Services Engineering Research and Technology

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This paper studies the substitution of air condensation by water condensation in the chiller of a university building. This building has a surface of about 30,000 m 2 , is located in a city of the Spanish north coast, and refrigeration is needed for six months a year. In this paper, the novelty lies in the cooling system of the condensation water, since the typical cooling tower is not going to be considered; instead, the domestic cold water consumed in the building would be used to cool the chiller condensing water. As the domestic water consumption in the building is neither constant nor coincident with the cooling requirements of the chiller, the use of the fire water tank as heat storage was proposed. Thus, the chiller is cooled by the water contained in the fire tank and this fire water is then cooled by the domestic water. With this solution, the reduction in the annual energy consumption of the chiller is around 18.6%. The requirements to implement this solution in buildings are: cool water for air conditioning produced in a centralized way, a relatively high building domestic water demand and a building fire water tank. Practical application:The solution proposed in this paper can contribute to primary energy savings by improving the energy efficiency of HVAC systems. It can be adopted in all buildings that require refrigeration, have a significant consumption of domestic water, and have a water storage tank for fire or other uses. The article includes the preliminary design of a water-water heat exchanger as a possible solution for cooling the chiller, but alternative solutions could be adopted. Finally, a cost-benefit analysis has been performed, showing that the proposed solution is feasible.

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Influence of electronic expansion valve on the performance of small window air conditioner retrofitted with R407C and R290

Cited by 2 publications

References 6 publications

Alternative Refrigerants for HCFC 22—a Review

Alternative Refrigerants for HCFC 22—a Review

Improving the efficiency of an air conditioning system using a fire water tank as thermal accumulator

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