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Direct contact water heater

  • US 4,520,761 A
  • Filed: 05/20/1983
  • Issued: 06/04/1985
  • Est. Priority Date: 05/20/1982
  • Status: Expired due to Term
First Claim
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1. A direct contact water heater comprising:

  • a main chamber including a hot gas inlet and cold water feed means to feed cold water in said main chamber, whereby to effect direct contact heat exchange between said hot gas and said cold water, the improvement wherein said heater also includes an antechamber having a hot gas outlet coupled to said inlet of said main chamber, and including means to input hot gas into said antechamber and hot water feed means to feed hot water into said antechamber, the temperature of said hot water being higher than the dew point of the hot gas input into the antechamber whereby the dew point of the hot gas outputted by the antechamber is increased and whereby the cold water is heated to a temperature higher than the dew point of the hot gas fed into the antechamber, said antechamber including a hot water outlet coupled to said hot water feed means whereby said hot water is recycled through said antechamber, and a reservoir, the level of which is maintained by flow-control means, said main chamber including a heated water outlet, said outlet being coupled to said flow-control means to maintain the level in said reservoir in the antechamber.

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