Analysis of indoor environment and insulation performance of residential house with double envelope vacuum insulation panels

Abstract

Double envelope vacuum insulation panels (VIPs) have a possibility to significantly increase the service lifetime. In this paper, double envelope VIPs were produced and installed in the residential house. The performance of installed VIPs was evaluated by using the measuring data of heat flux meter. In addition, the total energy, the heating load and the indoor thermal environment of this house were measured and analysed. The average heating load and the average temperature difference between room temperature and ambient air temperature on the representative day was 2.49 kW and 29.9 oC, respectively. The heat loss coefficient per floor area was estimated as 0.69 W/(m2K) and it was almost the same as the value calculated at the time of design. The result of indoor environment measurement showed that the room temperature was maintained at around 20 oC and PMV was -0.5 oC or higher although the outside air temperature fluctuated between -5 oC and -10 oC. The effective thermal conductivities of double envelop VIPs were all estimated as 0.01 W/(mK) or less. It is considered that the insulation performance of the vacuum insulation panels is maintained.

Installation Cost and Heat Extraction Performance Analysis of H-Shaped PC Pile Ground Heat Exchangers for Small Buildings

“…Table 3 summarizes the electric energy, heat extraction, heating output, and average SCOP during the heating period. The heating output in the heating period was approximately 5000 kWh, which is equivalent to the annual heating load of one residential house with high thermal insulation specifications [14]. This result confirms that this GSHP system is capable of continuous heating operations.…”

“…In addition, if T s0 − T f is set to 15 • C, the heat extraction rate per the GHE's length can be estimated as 33-36 W/m. Since the heat load is approximately 2.5 kW in midwinter and in a residential home with high thermal insulation specifications, as shown in [14], the required heat extraction is approximately 1.9 kW if the COP of the GSHP is set to 4. The required GHE length can be estimated as 58 m by dividing the required heat extraction by the heat extraction rate per the GHE's length; thus, 8 m × 8 m GHEs are sufficient to provide the required heat extraction.…”