The annual energy consumption for space heating and cooling in a office building of Japan is 359GJ/m2 [4]. About 40% of the annual energy consumption for space heating and cooling will be expected to be reduced using this solar thermal system for the similar type of the office building. Therefore, the reduced annual energy consumption for space heating and cooling in the field test office building is assumed by 57.6GJ/year. The reduced crude oil and the CO2 emission are estimated by 1.5kL and 4ton using the rates of 38.7GJ/kL and 2,649kg-CO2/kL, respectively.

The initial cost of this solar thermal system was 20 million JPY included the construction fee. If this solar system is used for 20 years, the CO2 reduction cost is 250 JPY/kg-CO2.

3. Conclusion

The solar desiccant cooling system was developed and the system performance was described in this paper. This system was developed as the passive solar thermal system using the renewable energy without the heat source equipment and the dehumidification cooling system for the fresh air.

From the field test results, it was found that the solar desiccant cooling system for office building

was effective throughout a year.

Acknowledgement

This study was supported by the research funds of NEDO project, Research and Development of

Technologies for New Solar Energy Utilization Systems for FY2005-F2007, and Grant-in-Aid for

Scientific Research (C)(19560598). The authors would like to express their sincere thanks to the

support.

References

[1] H. Roh, K. Suzuki, Research and Development of Air-based Passive Solar Dehumidification Cooling System, Part 1 Operation Test of Solar Dehumidification Cooling System, Proceeding of JSES/JWEA Joint Conference 2006 (Renewable Energy 2006 Japan Day), pp.309-312. (in Japanese)

[2] H. Roh, K. Suzuki, Research and Development of Air-based Passive Solar Dehumidification Cooling System, Part 2 Field Test of Solar Dehumidification Cooling System in Summer, Proceeding of JSES/JWEA Joint Conference 2007, pp.405-408. (in Japanese)

[3] S. Song, K. Suzuki, H. Roh, Study on the Performance of Dehumidification Cooling System with Solar Thermal and Well Water, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2008, D-2, pp.1209-1210. (in Japanese)

[4] Heat Pump & Thermal Storage Technology Center of Japan, White Paper of Heat Pump and Thermal Storage, pp.335, Ohmsha, 2007. (in Japanese)