| 摘要 |
Cooling apparatus of the Joule Thomson type includes a load situated below and spaced from the nozzle, a body of absorbent material in heat exchange relationship with the load, and a valve controlling the effective area of the nozzle to vary the flow of refrigerant automatically under the control of a sensor situated in heat exchange relationship with the absorbent material. To achieve the required heat exchange relationship between them the sensor may be in contact with the absorbent material, or separated from it by a metal wall, or even slightly spaced from it, provided that sufficient heat flow can occur from the sensor to the absorbent material to cause the response to depend on the extent to which the absorbent material is saturated with liquid refrigerant.
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