Pergamon Renewable Energy, Vol.5, Part I, pp. 339-341, 1994 Elsevier Science I3.d Printed in Great Britain 0960-1481/94 $7.004-0.00 DEVELOPMENT OF A HYBRID HOUSE WITH THE PHOTOVOLTAIC SYSTEM AND EARTH HEAT STORAGE SYSTEM Osamu Ishihara, Qingyuan Zhang and Fumiko Yoshihara Department of Architecture, Kumamoto University 2-39-1 Kurokami, Kumamoto 860, Japan ABSTRACT To make full use of surplus electricity at night and even off the peak electric demands in the daytime, a residence(the Clean Energy House) with the earth heat storage system and the photovoltaic system is being developed in Kumamoto City, Kyushu Island. The thermal performance of the earth heat storage system including the house is predicted by numerical simulations. The performance of the solar cells installed on the roof of the house is predicted with the regression equations from some experimental studies conducted by the authors. It is predicted that the house can be air-conditioned only by surplus electricity at night. The other electric demands such as lighting, cooking etc. can be met by the photovoltaic system. KEYWORDS Earth heat storage; photovoltaic system; surplus electricity at night; economic COP. OUTLINE OF THE HYBRID HOUSE The house shown in Fig.1 and Fig.2 is being built in Kumamoto City, Japan. The total floor area of the house is 138 m 2, which is about the average level of the Japanese residences. A heat pump is used as the PV modules with an angle of inclination of 30* c q t'3 q co Fig.1 South elevation of the house G o~ 2.0 i 6.0 I Jc~ F===== Soni- ~ tory , spoce : [ ic It", I Kichen Dining room 'XJLiving room 2.0 t I o ¢,; uP t-4 t.t3 t",q i- Fig.2 Plan of the house 339