Abstract :
[en] This paper examines the in-situ performance of an EAHP installed in a residential building in Belgium. The EAHP produces hot water to heat the building, and produces the DHW which is stored in a hot water tank. Due to limited ventilation airflow, the heat pump heating capacity is limited to 1450 W. During the experimental campaign, a refrigerant leakage was identified, and the impact on the performance was monitored. The first part of the paper focuses on the description of the exhaust air heat pump technology, and on previous work conducted on experimental on-site characterization of EAHPs. The second part describes the case study, with a detailed description of the building and the HVAC system, with a focus on the design and the control of the system. The monitoring system is also explained. The third section details the results. The behavior of the heating system for typical days is first introduced. It is shown that the exhaust air heat pump operates continuously in winter, and that the electric resistance is alternatively switched on and off to cover the peaks of the heating demand. The indoor thermal comfort is analyzed and shown to be satisfactory both in winter and summer. However, the hot water set-point temperature is not reached in summer, due to a refrigerant leakage. The performance is analyzed through two performance indicators: the average weekly COP and heating capacity. The impact of the refrigerant leakage on performance is clearly shown, with a reduction of 60 % and 50 % of the heating capacity and the COP, respectively. In the fourth section, the performance is extrapolated for a typical meteorological year. In the simulation, the heat pump covers 78 % of the energy demand of the building, and 22 % is covered by the electric resistance. About 43 % of the electricity consumption is related to the heat pump, 43 % to the resistance and 14 % to the auxiliaries. The seasonal COP is calculated to be 2.3.
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