| Title |
Design of an Optimal Operation Scheduler to Maintain Domestic Hot Water Temperature in a Cascade Heat Pump System |
| Authors |
박용국(Yong Kuk Park) ; 이민구(Min Goo Lee) ; 이태훈(Tae Hoon Lee) ; 김태원(Tae Won Kim) |
| DOI |
https://doi.org/10.5573/ieie.2025.62.9.63 |
| Keywords |
High-medium temperature heat pump; DHW temperature maintenance; Operation scheduler |
| Abstract |
In this paper, we suggest an optimal operation scheduler to maintain domestic hot water(DHW) temperature in a high-medium temperature cascade heat pump systems. Because gas boilers are commonly used in existing buildings with the issues of fuel cost volatility and high carbon emissions, heat pump system with high performance are gaining attention. However, due to the lower outlet temperature of heat pump, a cascade structure producing medium-temperature water and boosting it to high-temperature is required. In this structure, the high-temperature storage tank directly connected to the DHW load experiences significant temperature fluctuation due to variable demand, the heat supplied by the high-temperature heat pump, and the inlet temperature from the medium-temperature storage tank. To effectively respond to the fluctuation in DHW demand, it is essential to minimize the temperature variation of water in the high-temperature storage tank. Accordingly, this paper derives an optimal operation scheduling model that can maintain the DHW temperature of the high-temperature storage tank within a specified range while adapting to the variation of the DHW load. The performance of the proposed method was verified through simulation. |