Roll diaphragm compressor and low-pressure vapor compression cycles

A method of performing a vapor compression cycle comprising:

• performing a first portion of the vapor compression cycle on a fluid with a plurality of roll-diaphragm compressors that are respectively part of compressor-condenser pairs, the roll-diaphragm compressors including:
• a rigid compressor head including a bell-shaped interface wall that defines a concave portion, the compressor head further including an apex portion having an inlet port and outlet port;
• a round flexible roll-diaphragm coupled to the compressor head about an edge, and including a central portion that is coupled to and driven by a piston head, the roll-diaphragm driven in a rolling motion against the interface wall;
• and
• a compression chamber defined by the compressor head and roll-diaphragm, wherein performing the portion of the vapor compression cycle on the fluid with the roll-diaphragm compressor includes:
• the compression chamber receiving a refrigerant via the inlet port in a first state,
• compressing the refrigerant based on the volume of the compression chamber being made smaller, and
• expelling the refrigerant in a second state via the outlet port, wherein the roll-diaphragm compressor is configured based at least in part on a pressure ratio of a condenser associated with the roll-diaphragm compressor;
• and
• performing a second portion of a vapor compression cycle in a system having a single evaporator and no more than one evaporator, by the plurality of roll-diaphragm compressors respectively providing fluid to a condenser of a compressor-condenser pair, the respective condensers then providing the fluid to the single evaporator via one or more throttling valves,
• wherein the compressor-condenser pairs operate based on different pressure ratios, including each of the respective compressors operating with one or more of different average pressures within the compression chambers based respectively on one of the different pressure ratios, with different maximum volumes of the compression chambers based respectively on one of the different pressure ratios, and operating with non-synchronized compression timing based respectively on one of the different pressure ratios.

A method comprising:

• performing a first portion of a vapor compression cycle on a fluid with a plurality of roll-diaphragm compressors, the roll-diaphragm compressors including:
• a compressor head including an interface wall that defines a concave portion, the compressor head further including an apex portion having an inlet port and outlet port;
• a flexible roll-diaphragm coupled to the compressor head about an edge, the roll-diaphragm driven in a rolling motion against the interface wall;
• and
• a compression chamber defined by the compressor head and roll-diaphragm, the compression chamber receiving the fluid via the inlet port in a first state, compressing the fluid based on the volume of the compression chamber being made smaller, and expelling the fluid in a second state via the outlet port, wherein the roll-diaphragm compressor is configured based at least in part on a pressure ratio of a condenser associated with the roll-diaphragm compressor;
• and
• performing a second portion of the vapor compression cycle in a system having a single evaporator and no more than one evaporator, by the plurality of roll-diaphragm compressors respectively providing fluid to a condenser of a compressor-condenser pair, the respective condensers then providing the fluid to the single evaporator via one or more throttling valves,
• wherein the compressor-condenser pairs operate based on different pressure ratios, including each of the respective compressors operating with one or more of different average pressures respectively on one of the different pressure ratios, with different maximum volumes of the compression chambers based respectively on one of the different pressure ratios, and operating with non-synchronized compression timing based respectively on one of the different pressure ratios.