The purpose of this study is to make the target condition of experimental assessment based on the standard EN1264. To achieve this purpose, the characteristic errors, which are caused by characteristics of experimental setup and prevent the results from meeting the target condition, should be removed. This study proposes an experimental setup and suggests a control strategy based on standard EN1264. For the specifications of the experimental setup, the essential equipment and the configuration of the heat production system were deduced. For a proper control strategy, possible control strategies were derived by investigating the control-related factors such as reference points and control algorithms, and the most proper control strategy was validated by experimental assessment. Practical application: This study presents an experimental assessment to evaluate the thermal output of radiant floor heating systems based on the standard EN1264 referenced by ISO11855-2:2012. The proposed experimental assessment method will be able to supplement ISO11855-2:2012 and contribute to the development of thermally effective radiant heating panels. Therefore, it is expected that the results will be helpful to researchers for indoor environment, heating, ventilating, and air conditioning engineers, system manufacturers, and those who want to analyze the thermal output of radiant floor heating panels based on ISO 11855-2:2012.
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.
The load-balancing method is to make the different amount of heating and cooling loads to be similar as possible for handling the more load by the balanced heat recovery (BHR) system which has higher energy performance than auxiliary system. When this method is applied, the zone set temperatures should be in comfort range and the additional energy to BHR system should not exceed the energy consumption by auxiliary system of general method. In result, the total energy consumption is lower, and some zones were more comfortable because heating or cooling set temperature was varied to the middle of comfort range.
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