Comparison of the heating performance of air-source heat pumps using various types of refrigerant injection

Heo, Jaehyeok; Jeong, Minsu; Baek, Changhyun; Kim, Yongchan

doi:10.1016/j.ijrefrig.2010.10.003

Cited by 120 publications

(30 citation statements)

References 8 publications

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“…Because only one compressor is used, the vapor injection technology is relatively cheap. So the vapor injection technology has been widely investigated and applied, especially in scroll compressors and screw compressors [5][6][7][8][9]. For the rotary compressor, most of the investigations of economizer technology focused on the twin-cylinder rotary compressor [10][11].…”

Section: Introductionmentioning

confidence: 99%

A novel vapor injection structure on the blade of a rotary compressor

Liu

Wang

Shi

et al. 2016

Applied Thermal Engineering

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Heat pumps with rotary compressors operating in low temperature ambient will face heavy performance degradation. A novel vapor injection structure on the blade for the rotary compressor has been proposed in this paper to overcome the back-flowing drawback of the traditional cylinder injection structure and enlarge the injection area. Based on a verified numerical model, the performance of a rotary compressor with the blade injection structure has been investigated. The results indicate that: the proposed vapor injection structure can eliminate the back-flowing of the injected refrigerant; compared to the traditional injection structure, the new structure can enhance the volumetric efficiency and injection mass flow-rate by 1.8~2.7% and 26.6~57.2%, respectively; and compared to the traditional injection structure, the new structure can increase the heating capacity and COP by 23.1~48.9% and 3.2~8.0%, respectively.

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Section: Introductionmentioning

confidence: 99%

A novel vapor injection structure on the blade of a rotary compressor

Liu

Wang

Shi

et al. 2016

Applied Thermal Engineering

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“…히트펌프는 공기, 지열, 태양열 등의 다양 한 열원을 냉난방, 급탕 등의 고급에너지로 변환시 키는 친환경의 대표적 에너지 기기이다. 또한, 단일 기기로는 이산화탄소 발생 저감효과가 매우 큰 냉 난방 기기이다 [2]. 히트펌프를 이용하여 기존의 보일러 등의 냉난방 시스템을 완전 대체하기 위해서는 급탕 등을 위한 고온수 제조가 가능하여야 한다 [3,4] …”

Section: 서 론unclassified

Study on the Performance of a Cascade Heat Pump with Two-stage Water Heating Process

Jang¹,

Choi²

2016

Transactions of the Korea Society of Geothermal Energy Engineer

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It is estimated that only heating and cooling take about one third of the total energy consumption worldwide. However, the conventional heating and cooling systems have low efficiencies. Also, boilers and electric heaters that are mostly used to generate both domestic and industrial hot water are inefficient and high energy consumers. For this reason, cascade heat pumps which are known to be very energy efficient and have less environmental impact are being promoted to replace conventional heating, cooling and hot water systems. In this study, a newly designed cascade heat pump by twostage water heating method has been experimentally investigated. By adopting the auxiliary heat exchanger, the performance of the system was increased. The performance enhancement rate of the system could be maximized by adjusting the low stage compressor speed rather than the high stage compressor speed. The performance of the system with the auxiliary heat exchanger was enhanced by 16.5%.

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“…Many investigations indicated the economizer technology could effectively improve the compressor performance in low ambient temperature [1][2][3].However, the application of economizer in single-cylinder rotary compressors, which is also called vapor injection into the rotary compressor, is not as wide as twin-cylinder rotary compressors and scroll compressors [4][5]. The main barrier constraining the application of economizer in singlecylinder rotary compressors is its inherent compressor structure.…”

Section: Introductionmentioning

confidence: 99%

Comparative research on air conditioner with gas-injected rotary compressor through injection port on blade

Wang

Liu

Shi

2016

Applied Thermal Engineering

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Economizer technology has become a critical method to improve the performance of air conditioners with rotary compressor in low ambient temperature. A novel vapor injection structure on the blade of the rotary compressor has been proposed in previous research to overcome the drawback of the traditional cylinder injection structure. Based on a verified numerical system model, the performance of an air conditioner adopting different economized rotary compressors has been investigated. The results indicate that: compared to the single cylinder rotary compressor with traditional injection structure, the rotary compressor with blade injection structure can enhance the heating capacity and COP by 12.9%~15.7% and 1.5%~4.1% in low ambient temperature, respectively. And compared to the twincylinder rotary compressor, the rotary compressor with blade injection structure has a competitive performance.

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Comparison of the heating performance of air-source heat pumps using various types of refrigerant injection

Cited by 120 publications

References 8 publications

A novel vapor injection structure on the blade of a rotary compressor

A novel vapor injection structure on the blade of a rotary compressor

Study on the Performance of a Cascade Heat Pump with Two-stage Water Heating Process

Comparative research on air conditioner with gas-injected rotary compressor through injection port on blade

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