A heat transfer system includes a first two-phase heat transfer fluid vapor/compression circulation loop including a compressor, a heat exchanger condenser, an expansion device, and a heat absorption side of a heat exchanger evaporator/condenser. A first conduit in a closed fluid circulation loop ci
A heat transfer system includes a first two-phase heat transfer fluid vapor/compression circulation loop including a compressor, a heat exchanger condenser, an expansion device, and a heat absorption side of a heat exchanger evaporator/condenser. A first conduit in a closed fluid circulation loop circulates a first heat transfer fluid therethrough. A second two-phase heat transfer fluid circulation loop transfers heat to the first heat transfer fluid circulation loop through the heat exchanger evaporator/condenser, including a heat rejection side of the heat exchanger evaporator/condenser, a liquid pump, a liquid refrigerant reservoir located upstream of the liquid pump and downstream of the heat exchanger evaporator/condenser, and a heat exchanger evaporator. A second conduit in a closed fluid circulation loop circulates a second heat transfer fluid therethrough having an ASHRAE Class A toxicity and a Class 1 or 2L flammability rating.
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1. A heat transfer system, comprising: a first heat transfer fluid circulation loop including: a fluid pumping device;a heat exchanger condenser configured to reject heat from a first heat transfer fluid flowing therethrough;a flow metering device; anda heat exchanger evaporator/condenser configured
1. A heat transfer system, comprising: a first heat transfer fluid circulation loop including: a fluid pumping device;a heat exchanger condenser configured to reject heat from a first heat transfer fluid flowing therethrough;a flow metering device; anda heat exchanger evaporator/condenser configured to absorb thermal energy into the first heat transfer fluid;wherein a first conduit in a closed fluid circulation loop circulates the first heat transfer fluid therethrough; anda second two-phase heat transfer fluid circulation loop configured to exchange heat with the first heat transfer fluid circulation loop through the heat exchanger evaporator/condenser, including: a liquid pump;a heat exchanger evaporator configured to evaporate a second heat transfer fluid via a thermal energy exchange with an airflow urged across the heat exchanger evaporator; anda receiver disposed between the heat exchanger evaporator/condenser and the liquid pump, the receiver configured to condense the second heat transfer fluid to a liquid state without subcooling;wherein a second conduit in a closed fluid circulation loop circulates the second heat transfer fluid through the heat exchanger evaporator/condenser, the receiver, the liquid pump, and the heat exchanger evaporator, the second heat transfer fluid having an ASHRAE Class A toxicity rating and an ASHRAE Class 1 or 2L flammability rating or their ISO 817 equivalents. 2. The heat transfer system of claim 1, wherein the first fluid circulation loop is disposed at least partially outdoors. 3. The heat transfer system of claim 1, wherein the second fluid circulation loop is disposed at least partially indoors. 4. The heat transfer system of claim 1, wherein the first heat transfer fluid has a critical temperature of greater than or equal to 31.2° C. 5. The heat transfer system of claim 1, wherein the fluid pumping device in the first fluid circulation loop is variable-speed. 6. The heat transfer system of claim 1, wherein the liquid pump in the second fluid circulation loop is a variable speed pump. 7. The heat transfer system of claim 6, wherein a speed of the liquid pump is determined by a heat exchanger evaporator superheat level of the second circulation loop. 8. The heat transfer system of claim 1, wherein the first fluid circulation loop further comprises an expansion device. 9. The heat transfer system of claim 1, wherein the first heat transfer fluid comprises a saturated hydrocarbon. 10. The heat transfer system of claim 1, wherein the first heat transfer fluid comprises propane, propene, isobutane, R32, R152a, ammonia, an R1234 isomer, or R410a. 11. The heat transfer system of claim 1, wherein the second heat transfer fluid comprises a mixture comprising an R1234 isomer and an R134 isomer or R32, or 2-phase water. 12. The heat transfer system of claim 1, wherein the second heat transfer fluid comprises sub-critical fluid CO2. 13. The heat transfer system of claim 3, wherein the liquid pump is disposed outdoors. 14. The heat transfer system of claim 2, wherein the heat exchanger evaporator/condenser is disposed outdoors.
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