Thermal Performance of a semi-Underground house 'Earthship':Measurement using the test house and computer simulation

摘要

An earthship is a kind of earth sheltered passive solar house utilizing recycled building amterials such as used cans and rubber tires for the wall construction. To obtain fundamental information on the thermal performance under the climate of Japan, caied ut were measurement using the test house wihtout any space heating/cooling equipments and a series of two-dimensional FEM simulations. Main findingsare summarized as follows: 1) The annual nad daily temeperature fluctuation of indoor air of the test house are remarkably stable comparing with those of the outdoor air. However, the indoor air temperature during th summer floats over 30 deg C. On the other hand, calculation results show that such problem can be solved by shading the south-facing large window. 2) In case using shading devices and night insulation(weather shutters) for the window, the estimated heating/cooling loads for the earthship model are about 20