| 摘要 |
PURPOSE:To prevent the occurrence of supercooling under a meteorological condition, e.g. an abnormal low temperature, by a method wherein a number of heat pipes each having a vaporizing part in soil around a storage space built in a ground are formed into a variable conductance type heat pipe sealed with working fluid and having the inner condensing part side sealed with non- condensing gas. CONSTITUTION:A variable conductance type heat pipe 14 has a vaporizing part 14a embedding in soil around a storage space built in a ground and a number of the heat pipes are provided in a state that a condensing part 14b is extended to a ground and exposed in the open ari. Since the temperature of the open air is lowered and the temperature of the heat pipe 14 is lowered, the steam pressure of working fluid 15 is also reduced. As a result, the volume of sealed non-condensing gas 16 is increased, the effective length of the condensing part 14b is shortened (a heat transfer area is reduced), heat conveying capacity of the heat pipe 14 is automatically damped, soil around a storage chamber 11 is prevented from supercooling, and temperature in the chamber is maintained in a set temperature range. |
