Method for exchanging heat in vapor compression heat transfer systems and vapor compression heat transfer systems comprising intermediate heat exchangers with dual-row evaporators or condensers

A vapor compression heat transfer system, comprising:

• a closed circulation loop comprising in fluid communication (a) an evaporator, (b) a compressor, (c) a dual row condenser, and (d) an intermediate heat exchanger (IHX) and containing therein a working fluid, the contained working fluid comprising,
• i. a fluoroolefin working fluid selected from at least one at least one compound with 2 to 12 carbon atoms, and
• ii. optionally one or more of:
• 1. a hydrofluorocarbon selected from one or more of HFC-32, HFC-134a, HFC-152a and HFC-227ea,
• 2. hydrocarbon,
• 3. carbon dioxide, or
• 4. CF3I, and
• wherein said evaporator (a) comprises dual rows of serially connected tanks, a first tank of one of said rows having a feed end with an inlet, and a second tank of said other rows having a discharge end with an outlet, and said rows of said dual row evaporator fluidly connected to one another through a collector to convey fluoroolefin working fluid from said inlet end to said outlet end through said evaporator, said dual row condenser (c) comprises,
• (1) a back row having a first manifold for receiving and distributing the fluoroolefin working fluid to a plurality of channels for conveying the fluoroolefin working fluid to a downstream second manifold in only a first direction along a third axis, and
• (2) a front row comprising first, second and third sections connected for serial flow, a first one said sections located at an upper portion of said front row providing flow only in a second direction opposite to said first direction, an intermediate section providing flow in only a third counter-current direction, and a distal subcooling section located at a lower portion of said front row providing flow in only said second direction and having an outlet for discharging subcooled fluoroolefin working fluid, wherein each section of said front row comprises a plurality of tubes;
• and
• said IHX (d) comprises a first tube having an inlet connected to said outlet of said subcooling section of said condenser, and an outlet connected to and in flow communication with said feed end inlet of said first tank, and a second tube having an inlet connected to said outlet at said discharge end, and an outlet connected to said compressor inlet, wherein said first and second tubes of said IHX are in thermal contact with one another.