Fig. 15 shows boiler heating used to DHW. The annual DHW heating of Cases A, B and Case C were 3.842kWh/year and 1.467kWh/year, respectively. The DHW heating of Case C decreased to about 40% as compared with Cases A and B by solar energy used to DHW supply.

3.2. Annual heating and cooling load and boiler heating used to DHW

Fig. 16 shows annual cooling and heating load and boiler heating used to DHW. Annual heating and cooling load and boiler heating used to DHW of Case A, B and C were 7.09MWh/year, 6.81MWh/year and 3.96MWh/year, respectively. Annual heating and cooling load and boiler heating used to DHW of Case C decreased to about 44% as compared with Case A.

Case A Case B Case C Case C

No adjacent houses Adjacent houses Adjacent houses and Solar energy used to

active solar heating floor heating

Fig 16. Annual cooling, heating and hot water supply

4. Conclusion

The total effect of solar space heating with active and passive ways were examined using the detailed system simulation with a generalized simulation tool (EESLISM ver6) developed by the authors.

The annual heating load for the adjacent houses Case B increased by 1.37 times compared with the no adjacent houses Case A. However, the annual heating loads for the adjacent houses and active solar heating system Case C were almost equal to those of Case A. In the dense housing area, heating by active solar space heating system is effective.

The annual cooling loads for the adjacent houses Cases B and C were about 55% compared with the no adjacent houses Case A. This result is mainly the influence by the difference of incident solar radiations of the eastern and western outside surfaces.

Acknowledgment

This study was supported by the Grant-in-Aid for Scientific Research (C) (19560598), The authors would like to express their sincere thanks to the support.

References

[1] Higuchi, Togashi, Udagawa, Tanabe(2008). Continuous development and future perspective of EESLISM, AIJ, 1119 — 1122 . (in Japanese)

[2] Higuchi, Udagawa(2007) : Effects of trees on the room temperature and heat load of residential building, building simulation 2007 in China Beijing

[3] Higuchi, Udagawa, Sato, Kimura (2007): Study on effect of housing placement on annual space heating and cooling loads of the house — Study on heat load simulation considering thermal effects of external environment Part2 , J. Environ. Eng., AIJ, No.612, 31-38 (in Japanese)

[4] Higuchi, Udagawa, Sato, Kimura (2001): Calculation model of solar radiation and long wave radiation for external environment — Study on heat load simulation considering thermal effects of external environment Part1, J. Archit. Plann. Environ. Eng., AIJ, No.544, 9-15 (in Japanese)

[5] Architectural Institute of Japan, Expended AMeDAS Weather Data, 2005. (in Japanese)