Fig.13 shows monthly heating load and solar energy used to floor heating. Annual heating loads for Case A, B and C were 0.56MWh/year, 1.74MWh/year and 0.77MWh/year, respectively. Annual heating loads for Case B and C increased by 3.1 times and 1.37 times compared with Case A, respectively. Annual solar energy used to floor heating in Case C was 2.96MWh/year. In the dense housing area, heating by active solar space heating system is effective.

Fig.14 shows monthly cooling load. Annual cooling loads for the adjacent houses Cases B and C were about 53% compared with the no adjacent houses Case A. This result is mainly the influence by the difference of incident solar radiations of the east and west surfaces, as Fig.6 showed.

Jan Feb Mar Apr May Jun Jly Aug Sep Oct Nov Dec Month

Fig 13. Monthly heating load and Solar energy
used to floor heating [kWh/month]