Multiple compressor heat pump or air conditioner

  • US 5,970,728 A
  • Filed: 04/10/1998
  • Issued: 10/26/1999
  • Est. Priority Date: 04/10/1998
  • Status: Expired due to Term
First Claim
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1. In a refrigeration system of the type having a condenser, evaporator, refrigerant and the capabilities of at least heating and cooling modes of operation, a multiple compressor system in parallel operation comprising, in combination, a primary compressor and at least one secondary compressor, where the condenser and evaporator refrigerant are sized for the mass flow created by the primary compressor operating exclusively in the cooling mode at refrigerant condensing temperatures down to 80°

  • F. and evaporator temperatures up to 55°

    F. as well as in the heating mode at refrigerant condensing temperatures down to 80°

    F. and evaporator temperatures up to 55°

    F. and where said secondary compressor commencing operation in the heating mode only when the outdoor temperature drops below a predetermined set point where the extra mass flow created by the secondary compressor will not exceed the mass flow limitations set for the system by the design criteria for the primary compressor operating exclusively in the heating and cooling modes as described above.

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