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warm air to building electric strip heat auxiliary heating cold air blower tubing return air ducting refrigerant-to-air heat exchanger refrigerant cool air cool air condensate drain air-to-air heat pump outdoor unit geothermal heat pumps also provided higher-efficiency cooling performance compared to early-generation air- source heat pumps. The North American market for geothermal heat pumps has grown steady over the last 30 years, largely driven by the potential for high efficiency and thus lower operating cost. COLD CLIMATE AIR-SOURCE HEAT PUMPS As the market for geothermal heat pumps increased over the last 20 years, so did efforts to improve the performance of air-source heat pumps. New refrigeration technologies such as enhanced vapor injection (EVI), variable- speed “inverter” compressors, and electronic expansion valves, none of which were available for use in early-generation heat pumps, now allow modern air-source heat pumps to achieve significantly higher thermal performance at cold outdoor temperatures, in some cases as low as -22oF. Many “cold climate” air-to-air heat pumps (a.k.a. “low ambient” air- source heat pumps) are currently available as “ductless” split systems. A single outdoor unit connects to one or more indoor air handlers using refrigeration piping. Figure 1-5 shows the concept for a ductless split air- to-air heat pump system with two interior wall-mounted air handlers. Figure 1-5 refrigeration piping indoor evaporator & air handler air-cooled condenser Figure 1-4 8 indoor air handler filter inside outsidePDF Image | Heat Pump Systems 2020
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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