IOP Conference Series: Earth and Environmental Science, 2019
The issue of global warming has triggered more critical issues, and today’s refrigerants with hig... more The issue of global warming has triggered more critical issues, and today’s refrigerants with high global warming potential (GWP) are facing the challenges of being phased out. According to 2014 Assessment Report of the Refrigeration, Air-Conditioning and Heat Pumps Technical Options Committee (RTOC Assessment Report 2014), the R410A has GWP of 2100 and is widely used in residential air-conditioning and heat pump systems. Currently, in the market, the potential refrigerant that can be used to replace R410A in the air-conditioning system is R32. The purpose of this project is to create a new refrigerant mixture using low GWP refrigerant as a base that can replace for R410A in an air-cooled split air conditioner. Simulation works have been developed using Refprop software to simulate the refrigeration cycle with the operating conditions of the air-cooled split air conditioner, in the tropical region. The chosen cycle was an ideal vapour compression cycle with the evaporating and conde...
Solar drying systems are extensively used in agricultural and marine for food preservation. Most ... more Solar drying systems are extensively used in agricultural and marine for food preservation. Most of the developed solar drying systems employed air-based solar collector in generating hot drying air. However, air-based solar collectors do not always give a steady hot air supply under a fluctuated solar radiation intensity. This is particularly caused by the low thermal storage ability of air. Therefore, the solar drying system proposed in this work employs a liquid-based solar collector with a thermosyphon loop whereby a phase change working fluid is used to transfer the heat energy from solar collector to heat exchanger. The liquid-based solar collector used consists of evacuated glass tube with U-pipe. The effects of series and parallel connection of U-pipe on the performance of solar drying system are investigated experimentally. The performances of water and ethanol as the phase change working fluid are also tested for each of the U-pipe connections. The results show that the av...
IOP Conference Series: Earth and Environmental Science, 2019
The issue of global warming has triggered more critical issues, and today’s refrigerants with hig... more The issue of global warming has triggered more critical issues, and today’s refrigerants with high global warming potential (GWP) are facing the challenges of being phased out. According to 2014 Assessment Report of the Refrigeration, Air-Conditioning and Heat Pumps Technical Options Committee (RTOC Assessment Report 2014), the R410A has GWP of 2100 and is widely used in residential air-conditioning and heat pump systems. Currently, in the market, the potential refrigerant that can be used to replace R410A in the air-conditioning system is R32. The purpose of this project is to create a new refrigerant mixture using low GWP refrigerant as a base that can replace for R410A in an air-cooled split air conditioner. Simulation works have been developed using Refprop software to simulate the refrigeration cycle with the operating conditions of the air-cooled split air conditioner, in the tropical region. The chosen cycle was an ideal vapour compression cycle with the evaporating and conde...
Solar drying systems are extensively used in agricultural and marine for food preservation. Most ... more Solar drying systems are extensively used in agricultural and marine for food preservation. Most of the developed solar drying systems employed air-based solar collector in generating hot drying air. However, air-based solar collectors do not always give a steady hot air supply under a fluctuated solar radiation intensity. This is particularly caused by the low thermal storage ability of air. Therefore, the solar drying system proposed in this work employs a liquid-based solar collector with a thermosyphon loop whereby a phase change working fluid is used to transfer the heat energy from solar collector to heat exchanger. The liquid-based solar collector used consists of evacuated glass tube with U-pipe. The effects of series and parallel connection of U-pipe on the performance of solar drying system are investigated experimentally. The performances of water and ethanol as the phase change working fluid are also tested for each of the U-pipe connections. The results show that the av...
Uploads
Papers