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용액 저장 탱크가 결합된 태양열 구동 흡수식 칠러의 건물 냉방부하별 성능 특성 분석
최형원(Hyung Won Cho),정재희(Jaehui Jeong),강용태(Yong Tae Kang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The solar-assisted absorption chiller is integrated with the thermal energy storage tanks to implement elongated operation with solar energy as well as to complement the incompatibility of the time gap between the cooling load of the building and the supply of renewable energy source. In this research, the thermal energy storage capacity and the operating characteristics of the system merging a single-effect absorption chiller employing water-lithium bromide as a working fluid and three thermal energy storage tanks were investigated. This system transforms the solar thermal energy into the chemical potential of water-lithium bromide solution to store the thermal energy and has the advantage of not requiring insulation of the thermal energy storage tank. Numerical investigation has been conducted to analyse the ratio between the mass flow rate of refrigerant to absorption chiller and that of thermal energy storage tank, which has been set as a key parameter to optimize the system performance. Based on the data of the cooling load of the residential building in July, which requests the largest cooling load, the feasibility study of energy management plan is conducted to establish the optimization of system performance. The regenerated water vapor is condensed to be supplied to absorption chiller for producing the cooling effect during the daytime and the rest is stored in the refrigerant storage tank to response to the cooling load during the night. This supply ratio of refrigerant is the significant parameter to optimize the operation of the system according to the specific cooling load of the building. Based on a hotel with cooling area of 30 m2, the optimized thermal energy storage density is estimated of 106.7 kWh/m3. The optimal cooling capacity of the evaporator of the absorption chiller is 2.2 kW at the ratio of thermal energy storage of 0.53, which means 53% generated refrigerant should be stored to effectively relieve the cooling load without solar energy. Simultaneously, the maximum thermal energy storage density is estimated of 216.4 kWh/m3, and that of the cooling capacity of the evaporator of absorption chiller is 4.46 kW.
민하예(Haye Min),정재희(Jaehui Jeong),정진희(Iinhee Jeong),강용태(Yong Tae Kang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, a simulation study of the sorption thermal battery for cooling and heating in buildings using H₂O-LiBr was conducted. With the assumption of well-conditioned external fluids, a mathematical model is established. The characteristics such as pressure, temperature, concentration, and power change of the soprtion thermal battery system during charging and discharging were investigated, and the performance of the thermal battery system was analyzed. This demonstrates that the sorption thermal battery system can be an effective means for the storage of thermal energy in building.
민하예(Haye Min),정재희(Jaehui Jeong),정진희(Iinhee Jeong),강용태(Yong Tae Kang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, a simulation study of the sorption thermal battery for cooling and heating in buildings using H₂O-LiBr was conducted. With the assumption of well-conditioned external fluids, a mathematical model is established. The characteristics such as pressure, temperature, concentration, and power change of the soprtion thermal battery system during charging and discharging were investigated, and the performance of the thermal battery system was analyzed. This demonstrates that the sorption thermal battery system can be an effective means for the storage of thermal energy in building.
민하예(Haye Min),정재희(Jaehui Jeong),정진희(Iinhee Jeong),강용태(Yong Tae Kang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, a simulation study of the sorption thermal battery for cooling and heating in buildings using H₂O-LiBr was conducted. With the assumption of well-conditioned external fluids, a mathematical model is established. The characteristics such as pressure, temperature, concentration, and power change of the soprtion thermal battery system during charging and discharging were investigated, and the performance of the thermal battery system was analyzed. This demonstrates that the sorption thermal battery system can be an effective means for the storage of thermal energy in building.
용액 저장 탱크가 결합된 태양열 구동 흡수식 칠러의 건물 냉방부하별 성능 특성 분석
최형원(Hyung Won Cho),정재희(Jaehui Jeong),강용태(Yong Tae Kang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The solar-assisted absorption chiller is integrated with the thermal energy storage tanks to implement elongated operation with solar energy as well as to complement the incompatibility of the time gap between the cooling load of the building and the supply of renewable energy source. In this research, the thermal energy storage capacity and the operating characteristics of the system merging a single-effect absorption chiller employing water-lithium bromide as a working fluid and three thermal energy storage tanks were investigated. This system transforms the solar thermal energy into the chemical potential of water-lithium bromide solution to store the thermal energy and has the advantage of not requiring insulation of the thermal energy storage tank. Numerical investigation has been conducted to analyse the ratio between the mass flow rate of refrigerant to absorption chiller and that of thermal energy storage tank, which has been set as a key parameter to optimize the system performance. Based on the data of the cooling load of the residential building in July, which requests the largest cooling load, the feasibility study of energy management plan is conducted to establish the optimization of system performance. The regenerated water vapor is condensed to be supplied to absorption chiller for producing the cooling effect during the daytime and the rest is stored in the refrigerant storage tank to response to the cooling load during the night. This supply ratio of refrigerant is the significant parameter to optimize the operation of the system according to the specific cooling load of the building. Based on a hotel with cooling area of 30 m2, the optimized thermal energy storage density is estimated of 106.7 kWh/m3. The optimal cooling capacity of the evaporator of the absorption chiller is 2.2 kW at the ratio of thermal energy storage of 0.53, which means 53% generated refrigerant should be stored to effectively relieve the cooling load without solar energy. Simultaneously, the maximum thermal energy storage density is estimated of 216.4 kWh/m3, and that of the cooling capacity of the evaporator of absorption chiller is 4.46 kW.