Sustained thermodynamic equilibrium used to control the temperature of an experimental chamber

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Abstract
A large cold chamber has been developed for experiments on ice near its melting point. Temperature control is achieved by maintaining a three-phase two-component equilibrium temperature in a bath surrounding the experimental space. The proportion of ice and water is controlled continuously by using changes in system volume to switch refrigerant pumps. This enables the temperature to be controlled to +or-0.01 C. The equilibrium temperature is varied by using a solution instead of air-saturated deionized water.

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