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US4607488A Ground congelation process and installation 失效
地面凝结过程和安装

Ground congelation process and installation
摘要:
A refrigerant liquid flows through congelation probes (S1, S2, . . . ). The temperature of the liquid supplied to each probe is regulated as a function of the rate of congelation of the ground around the various probes and/or is progressively increased as the congelation progresses.
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