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Hydronic heating and cooling system

  • US 4,071,078 A
  • Filed: 11/03/1976
  • Issued: 01/31/1978
  • Est. Priority Date: 11/03/1976
  • Status: Expired due to Term
First Claim
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1. A hydronic heating and cooling system having heating and cooling modes and adapted to be connected to a terminal system to be heated or cooled comprising a chiller tank provided with a water reservoir in the bottom portion thereof, a refrigeration system operative during the cooling mode and including a compressor, a condenser and an evaporator in operative relationship to the water in said chiller tank, said evaporator being located in said chiller tank above said reservoir, a first conduit adapted to be connected on one end to the terminal system and extending therefrom into said chiller tank at a point below said evaporator, said first conduit including a riser portion extending upwardly through said evaporator and terminating above said evaporator to permit the water therein to be discharged therefrom and gravity fed across the evaporator into said reservoir during the cooling mode, a circulating pump, a second conduit connecting the reservoir in said chiller tank to the inlet side of said pump, a third conduit intersecting said first and second conduits, control valve means for controlling flow in said first and third conduits, a fourth conduit connected on one end to the discharge side of said pump and adapted to be connected on the other end to the terminal system, and heating means for heating the water in said fourth conduit during the heating mode, said valve means when the heating and cooling system is in the heating mode closing said first conduit and directing the flow of water from said first conduit through said third conduit into said second conduit where the water is adapted to be circulated by said pump through the fourth conduit to the terminal system, said valve means when said heating and cooling system is in the cooling mode blocking flow through said third conduit and opening said first conduit thereby permitting the water to be discharged from the riser portion of said first conduit where it is gravity fed across said evaporator into said reservoir, with the water from said reservoir entering the inside side of said pump through the second conduit and thereafter adapted to be circulated by the pump through the fourth conduit to the terminal system where the water returns to the heating and cooling system through said first conduit.

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