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120℃ 스팀 생성을 위한 100 kW급 히트펌프의 실험적 연구
왕은석(Eunseok Wang),나선익(Sun-Ik Na),이길봉(Gilbong Lee),백영진(Young-Jin Baik),이영수(Young-Soo Lee),이범준(Beomjoon Lee) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.2
Recently, the development of a heat pump technology to recover process waste heat and to generate steam of 120℃ or higher required for industrial processes, has attracted attention. The research of conventional heat pump utilizing the available energy is used primarily for air conditioning, and the production temperature is about 60℃, so it is difficult to utilize it for industrial use. Therefore, in this study, we developed a steam heat pump (SGHP) which recovers the waste heat of process and generates steam at 120℃. The low-pressure refrigerant R245fa, considered to be an eco-friendly refrigerant, has been selected as the refrigerant for SGHP in this study since its Ozone Depletion Potential (ODP) is zero and the Global Warming Potential (GWP) is relatively low. A flash tank functioning as a phase separator was installed in the rear stage of the condenser, and the saturated water of high temperature was decompressed to generate steam. It was started at the initial temperature of 70℃, and it was confirmed that 120℃ steam was produced after the system stabilized. We have conducted experiments by modifying the system, and ultimately achieved a heating capacity of 101.4 kW and a COP of 3.05.
R-134a 터보냉동기용 하이브리드타입 증발기의 열전달 성능에 관한 실험적 연구
왕은석(Eunseok Wang),김병련(Byeongryun Kim),박상준(Sangjun Park),정희여(Huiyeo Jeong),박찬우(Chanwoo Park) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Falling film heat and mass transfer involves the use of the latent heat of water. Due to the effective cooling performance of the process, it can be found in various equipment and designs such as cooling towers, evaporative coolers, absorption chillers, distillation process, and others. For these systems, the wettability of the solid surface is as an important factor. The improvement of this factor is directly related to the improvement of the evaporative cooling performance of the system. For the reduction of the structure of evaporator used in absorption chiller, experiments on the falling film evaporative heat transfer of the evaporator tubes were performed.
산업공정용 스팀생산 고온히트펌프 시스템 개발 및 실증사이트 구축에 관한 연구
이길봉(Gilbong Lee),이범준(Beomjoon Lee),왕은석(Eunseok Wang),나호상(Ho-Sang Ra),조준현(Junhyun Cho),백영진(Young-Jin Baik),신형기(Hyung-Ki Shin),이영수(Young-Soo Lee) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.5
Researches to reutilize waste heat from industrial processes have gained a lot of interest, recently. Steam is the most preferred heat source in industrial processes. Therefore the heat pump which reproduce waste heat as process steam, can give a high energy saving effect. To produce steam, the heat pumps should have operating points of 100℃ or higher. To meet this operation range, R245fa refrigerant-based cycle was developed to reduce condensation pressure. In addition, by implementing flashing steam production technology, the average temperature difference in high pressure heat exchanger was reduced resulting system efficiency improvement. In 2017, prototype products that produce 0.5 tons of steam per hour was developed and it achieved world-class performance. To implement the system into the industrial processes, control logic that reflects the characteristics of the flashing process, in which the condensate circulation flow rate and the steam production flow rate are inconsistent, has been developed. Demonstration site was constructed in one domestic chemical plant.