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CENTRAL HEATING AND COOLING SYSTEM

  • US 3,685,574 A
  • Filed: 10/26/1970
  • Issued: 08/22/1972
  • Est. Priority Date: 11/05/1969
  • Status: Expired due to Term
First Claim
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1. A central heating and cooling system comprising separate heating and cooling circuits, said heating circuit including a first main conduit means connected to a central heating source for circulating a first heat-transfer fluid, said cooling circuit including a main conduit means connected to a central cooling source for circulating a second heat-transfer fluid, each of the circuits comprising a plurality of temperature exchange units, each temperature exchange unit being connected by a branch line between a first and a second point on its associated main conduit, a nonreturn valve and a pump in each of said branch lines, the flow of the heat-transfer fluid in each branch line being from said first point to said second point, said first point being downstream of said second point along the associated conduit means thereby preventing the flow of the heat-transfer fluids through the branch lines when their associated pumps are not in operation.

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