Prediction of Heating and Cooling Energy Consumption in Residential Sector Considering Climate Change and Socio-Economic

Lee, Mi-Jin; Lee, Dong-Kun; Park, Chan; Park, Jin Han; Jung, Tae-Yong; Kim, Sang-Kyun; Hong, Sung-Hwa

doi:10.14249/eia.2015.24.5.487

Cited by 3 publications

(1 citation statement)

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“…Despite the use of a heat pump system, the amount of energy used for heating and cooling in buildings continues to increase. In particular, as the number of cooling systems increases due to climate change, energy consumption continues to increase [6]. Therefore, it was judged that it was necessary to study the improvement of the heat pump system to increase the cooling performance and save energy.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Cooling Performance Enhancement of a 20 RT (70 kW) Two-Evaporator Heat Pump with a Vapor–Liquid Separator

Yang

Kim

2022

Energies

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20 RT (70 kW) two-evaporator heat pump system was developed, manufactured, and tested to enhance the cooling performance using a vapor–liquid separator. In the proposed system, two evaporators are connected in series, and the refrigerant passing through the primary evaporator is separated into vapor and liquid using a vapor–liquid separator. The vapor refrigerant is passed to the compressor, whereas the liquid phase flows into the second evaporator. The amount of vapor refrigerant sent to the compressor can be adjusted through a needle valve opening (0%, 50%, and 100%). The influence of this parameter on the cooling performance was analyzed. The cooling performance tests were repeated five times to check repeatability. Data associated with the air and refrigerant sides were obtained, and the average coefficients of performance (COPs) were calculated. The average COP associated with the air side was approximately 5% lower than that pertaining to the refrigerant side owing to the heat loss. In terms of the air-side cooling performance, the average COP was 3.14, 3.40, and 3.68 when the valve openings were 0%, 50%, and 100%, respectively. The cooling performance when the valve opening was 100% was 17.2% higher than that for the valve opening of 0%. The findings demonstrated that the cooling performance of a heat pump can be enhanced using two evaporators and a vapor–liquid separator.

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Section: Introduction 1backgroundmentioning

confidence: 99%