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Thermostat for the setting of a constant temperature for a fluid

  • US 4,651,813 A
  • Filed: 03/25/1985
  • Issued: 03/24/1987
  • Est. Priority Date: 03/31/1984
  • Status: Expired due to Fees
First Claim
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1. In a thermostat for the setting of a constant temperature of a fluid with a low mass flow and a low flow velocity through heating of the fluid prior to the flow thereof through a heat source;

  • a cooling regulating circuit means including a cooler having a cooling medium flowing therethrough for cooling the fluid to a given lower temperature before entering a heating arrangement and a temperature sensor means for measuring the temperature of the fluid at the cooler outlet; and

    a heat regulating circuit means including said heating arrangement for heating the fluid to a constant temperature;

    the improvement comprising;

    said cooler and said heating arrangement being connected in series in the direction of flow of the fluid with a heat exchanger interposed in the path of the fluid between the cooler and the heating arrangement, said heat exchanger connected to the cooler downstream of the temperature sensor means for measurement of the temperature of the fluid at the cooler outlet, said heat exchanger having flowing therethrough both said cooling medium of the cooler and the cooled fluid, wherein the cooling regulator circuit means controls the cooler to cool the fluid prior to its heating in the heating arrangement to a temperature below said constant temperature and maintain the temperature difference between the temperature of the fluid at the cooler outlet and the set constant temperature at the outlet of the heating arrangement greater than a maximum deviation in temperature above the given lower temperature produced by the cooling regulating circuit means.

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