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Solar Assisted Heat Pump with Seasonal Heat Storage

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Solar Assisted Heat Pump with Seasonal Heat Storage ( solar-assisted-heat-pump-with-seasonal-heat-storage )

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Entropy 2021, 23, 47 3 of 17 In the literature, there are some exergy studies of PV/T-assisted HPs [16,17] in com- bination with heat storage tanks [18], and general exergy analyses of different building heating systems [19–21]. In this paper, the results of investigations on thermal properties and exergy analyses of a complex system of a solar assisted HP with seasonal storage and grey water heat recovery system are presented, which have not been found in the available literature. 2. Description of Analyzed Systems 2.1. Case Building The case study building is a two-story single-family house (Figure 1) with plan dimensions of 8.2 m × 11.3 m. It has 185 m2 of living area. The double-pitched roof has an N–S orientation. Analysis was performed for a low-energy building with specific heating demand 25.8 kWh/m2a. The U values of building envelopment are summarized in Table 1. Figure 1. Three-dimensional scheme of a case building. Four people were considered to occupy the house between 1800 and 700 the following day on weekdays, and between 0000 and 2400 on weekends. Necessary indoor air quality was provided with mechanical ventilation system. Exterior shades with shading factor Sf = 0.7 were used on all windows and on the green house when solar radiation on the horizontal plane was larger than 300 W/m2 and Tin > 24 ◦C. Table 1. Construction properties for standard and low-energy building. Dimension U—outside wall U—roof U—inner wall U—floor to ground U—glazing g of glazing Infiltration as air exchange per hour Heat gains Heating set point Cooling set point Value 0.142 W/m2K 0.155 W/m2K 0.426 W/m2K 0.211 W/m2K 1.4 W/m2K 0.62 0.2 h−1 5 W/m2 20 ◦C 25 ◦C The daily sanitary hot water (SHW) used is set to 120 L/day. Figure 2 shows the daily

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