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Study on the performance of steam generation heat pump using waste heat source with suction-line/liquid-line heat exchanger : 내부열교환기가 적용된 폐열원 이용 스팀생산 히트펌프의 성능에 관한 연구
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- Authors
- Advisor
- 김민수
- Major
- 공과대학 기계항공공학부
- Issue Date
- 2018-02
- Publisher
- 서울대학교 대학원
- Keywords
- Steam generation heat pump ; Waste heat recovery ; Internal heat exchanger ; Suction-line/liquid-line heat exchanger
- Description
- 학위논문 (석사)-- 서울대학교 대학원 : 공과대학 기계항공공학부, 2018. 2. 김민수.
- Abstract
- Steam generation heat pump, which is a heat pump cycle using waste heat source to produce industrial steam whose temperature is about 120℃, has different characteristics with other heat pump cycle like air source heat pump. It has high compression ratio because the maximum temperature of refrigerant in the cycle is more than 125℃. Besides, the temperature gradient in the heat exchanger is also different because the secondary fluid at condenser is steam which is two-phase state. Thus, the experiment of SGHP basic cycle is conducted first in order to investigate the distinctive features of SGHP and possibility to improve performance and to replace boiler. By conducting basic SGHP experiments of 8 kW lab-scale experimental equipment, heating capacity, coefficient of performance(COP) are calculated with variables of refrigerant charge, waste heat source temperature and degree of superheat. Also, other results such as compressor work, cooling capacity, refrigerant mass flow rate and so on are calculated with estimated temperature, pressure and mass flow rate at important points in order to analyze the cycle in detail.
Additional experiments are also conducted after applying suction-line/liquid-line heat exchanger which is internal heat exchanger in order to solve the performance degradation problem of basic SGHP cycle due to high degree of superheat and compression ratio. Performance improvement is confirmed compared to basic cycle : COP increase of 0.4 and heating capacity increase of 38~62%. And the cause of improvement is analyzed by pressure-enthalpy diagram comparison with basic cycle: evaporator pressure and degree of sub-cooling increase. Also, guideline for using SLHX to SGHP cycle efficiently are suggested.
- Language
- English
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