Effect of heat recovery water heater system on the performance of residential split air conditioner using hydrocarbon refrigerant (HCR22)

This study was aimed to investigate performance of a split type air conditioning (SAC) system applying exergy destruction method. A numerical model was established based on exergy destruction analysis of a Condenser Outlet Split-Split Air Conditioning (COS-SAC) system integrated with dual-temperature evaporator and incorporated capillary tube and ejector as expansion devices. An experimental test system was also established to experimentally validate the model. Two type of refrigerants R-290 and R-22 were involved in the evaluations. The Coefficient of Performance (COP) of the ejector COS-SAC system, exergy destruction, and exergy efficiency were determined and compared with those in the SAC system utilizing capillary tube. The results showed there was a significant improvement in the overall exergy efficiency of the COS-SAC systems. The COP of the COS-SAC system was also found to be better than the COP of the SAC system.

Section: Introductionmentioning

confidence: 84%

Exergy and Energy Analyses of Dual-Temperature Evaporator Split AC System Incorporated A Capillary Tube and A Two-Phase Ejector

Arsana

Kusuma

Sucipta

et al. 2020

“…The experiments were conducted using a split type air conditioner (compressor power of 0.68 kW, the cooling capacity of 2.6 kW) which was operated using HCR-22 refrigerant as working fluid. The refrigerant consisted of 99.7 % of propane, 0.15 % of butane, and 0.15 % of isobutane [31,32]. An evaporative cooling system was added as an extension to the AC system.…”

Section: Methodology 21 Experimental Methodsmentioning

confidence: 99%

Performance Enhancement of Split Air Conditioner During Evaporative Cooling Application

Mainil

Sulaiman

Mainil

et al. 2021

The increase of condenser temperature and pressure in air-conditioning leads to decreased cooling capacity and the increase of power consumption. Evaporative cooling could improve the thermal performance of the system. In this study, the evaporative cooling module was installed before the condenser to reduce the inlet air temperature to the condenser unit. The impact of condenser air temperature on the air conditioning system's overall performance was determined by varying the cooling pad discharge water flowrate of 880, 1040, and 1200 mL/min. The cooling load of 2000 W was employed in this experiment. The obtained results were compared with the air conditioning without an evaporative cooling module. It shows that the coefficient of performance (COP) increases with the increase of discharge water flow rate. The highest COP obtained is 7.09 at the flow rate of 1200 mL/min. The compressor work reduces about 6.57 % as compared with the air conditioner without evaporative cooling application. Besides, the COP increases by 12. 95 % at the highest flow rate.

“…Following the second generation, third generation refrigerants was composed of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbon (HCFCs), that was easy to use, they could operate under low pressure, is non-toxic, and possess a high GWP and ODP. The R22 had an ODP = 0.055 and GWP = 1810 [9], that effected ozone and global warming [10]. Therefore, the development of refrigerates has significantly decreased ODP and GWP.…”

Section: Evolution Of the Refrigerantmentioning

confidence: 99%

The Replacement of the R404A Refrigeration System with The Environmentally Friendly R448A, to Improve Convenience Store Energy Efficiency in Thailand

Saengsikhiao¹,

Taweekun²,

Maliwan³

et al. 2020

This study presents the energy saving characteristics of the R448A, instead of the R404A refrigeration system, in 5 convenience stores, with a total of 150 m 2 , situated in Central Thailand. The R448A hydrofluorocarbons/hydrofluoroolefins (HFCs/HFOs) (GWP=1390) is a non-azeotropic mixture of R32 (26%), R125 (26%), R1234yf (20%), R134a (21%) and R1234ze (E) (7%), which can be retrofitted to replace the R404A refrigeration system. The R404A hydrofluorocarbons (HFCs) (GWP=3735) is a near azeotropic mixture of R125 (44%), R143A (52%), R134A (4%). Both refrigerants are composed of polyol ester oil (POE), are incombustible and non-toxic. The R448A has a higher cooling capacity (Qe) and lower global warming potentials (GWP) than the R404A due to its hydrofluorocarbons (HFCs) R32 component and hydrofluoroolefins (HFOs) R1234yf/R1234ze (E) component, as opposed to the R404A. This was determined by measuring power consumption (kWh) and the ambient temperature (°C) through the use of power meters and temperature data logger respectively. The result obtained was able to summarize the relationship of all the parameters concerned, and showed an energy-saving average of 7.9%, i.e. 28,273 kWh/year per 5 stores, and a decreased global warming potential (GWP) of 70%, through the use of a digital scroll compressor.