Abstract
This study was conducted to derive the amount of energy savings when applying the method of making the load similar by changing the set temperature of the room in the building to which the simultaneous heating and cooling (SHC) system is applied. Energy savings were derived through theoretical analysis and comparisons through static simulations were performed to verify the proposed method. As a result, the energy savings are proportional to the energy limit that can be additionally input to the SHC and is proportional to the ratio of the coefficient of performance (COP) difference between the SHC and auxiliary heat source and the auxiliary heat source COP. That is, to increase the amount of energy savings, the maximum possible energy should be input for the SHC, or the SHC COP must be greater than the auxiliary heat source COP. In addition, comfort can be achieved stably by varying the set room temperature in a room with a small load. When a heat storage tank is installed or changing the indoor set temperature of both the hot and cold zones in real time by predicting the indoor load is possible, more energy can be saved.
Highlights
With the increase in the insulation performance of the building envelope and the spread of office automation equipment, the number of buildings that require cooling and heating, even in winter, is increasing
In this study, the amount of additional load that can be removed, the possibility of energy saving, and improvement of comfort due to changes in the indoor set temperature were analyzed conceptually when load balancing (LB) was applied considering the occurrence of heating and cooling loads
The energy that can be saved by LB is proportional to the energy limit that can be input to the simultaneous heating and cooling (SHC) and is proportional to the ratio of the coefficient of performance (COP) difference between the SHC and auxiliary heat source and the auxiliary heat source COP
Summary
With the increase in the insulation performance of the building envelope and the spread of office automation equipment, the number of buildings that require cooling and heating, even in winter, is increasing. The number of buildings that require cooling, heating, and hot water supply is increasing [1]. In this case, a boiler was used to supply heat to remove the heating load, and a refrigerator was used for heat extraction to remove the cooling load. When the indoor temperature is set in this manner, there is a high possibility that the room environment is out of the comfortable range or near the maximum or minimum limits. The indoor temperature should be adjusted within a comfortable range while using less energy
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