FIELD EXPERIMENT OF THERMAE WEEE DURING A YEAR : Experimental Studies on Application of the Ground for Annual Heat Storage Part 1

Abstract

This paper presents experimental results of field experiment to investigate thermal behavior of thermal well of closed type as heat source/sink of heat pump during a year. The thermal well is a circular pipe of steel. Dimensions of the well are diameter of 0.2m and 10m in length. The major results are as follows. (1) Under the heat extraction or supply of < c.a.450W(9Mcal/day) in amplitude of annual cycle, water in the well was more effective than outdoor air as heat source/sink of heat pump. (2) Under this condition, the drastic decrease of thermal conductivity in soil which causes drying of soil around the well never occurred during a year.