Prediction of the Energy Savings of a System Combining Air-conditioners Outdoor Unit with Hydroponic-cultivated Roof Plant
For the purpose of utilizing the cooling effect and solar shading of green roof plants, a system combining the outdoor unit of airconditioners with green roof plants is proposed. This paper describes the method of predicting the energy savings of the proposed system. An improved leaf transpiration model is developed to estimate how much water can be evaporated by the plant transpiration, and a leaf boundary model is newly developed to estimate how much air temperature can be decreased by the plant transpiration. An experimental system was built using hydroponiccultivated sweet potato. The solar shading and transpiration-cooling effects are measured and used to verify the accuracy of two newly developed models. The average and root mean square error (RMSE) are 2.9％ and 18.8％ for transpiration estimation, and 3.3％ and 94.0％ for estimating air temperature decrease. Further, the specification of six main air-conditioner manufactures are analyzed and divided into to three groups of high, middle and low improvement of energy efficiency accompanying to the outdoor air temperature decrease. Then the cooling loads of a standard office building at four typical climate area of Sapporo, Tokyo, Osaka, and Naha are simulated and used to estimate the energy consumed by the three groups of airconditioner at the conditions of with and without combining to hydroponic-cultivated roof plant. The results show that the energy saving rates are similar at four different areas, which are about 8％ for the high efficiency-improvement group, 6％ for middle efficiency-improvement group and 1％ for low efficiency-improvement group.
Energy savings Air-conditioner Hydroponic-cultivated Roof Plant Modeling Simulation
Fulin Wang Harunori Yoshida Michiko Yamashita
Department of Building Science,Tsinghua University,Beijing,China Department of Architecture,Okayama University of Science,Okayama,Japan Taisei Corp.,Tokyo,Japan
国际会议
The 6th International Symposium on Heating,Ventilating and Air Conditioning(第六届国际暖通空调学术会议)
南京
英文
419-427
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）