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recirculation water in the “swing tank”. If there is enough over-heated water from the primary tanks, the mixed temperature in the “swing tank” will be greater than or equal to the needed use temperature. This strategy works effectively with heat pump cycles that require a large temperature lift to the water, like CO2 heat pumps. If there is enough hot water use to balance out the circulation loop losses, no additional heat is needed in the “swing tank”. If additional heat is needed, it can be supplied by resistance heat or a dedicated heat pump. The existing instantaneous ERWH were reused to provide backup. Controls: The Site’s HPWH system does not have a central plant control, each HPWH operates in parallel with stand- alone controls. Each HPWH also has built-in control logic to cycle the units ON or OFF based on a thermocouple reading. The middle primary tank (ST-2) contains four thermocouples that are connected to the HPWHs. The HPWHs are turned ON when the thermocouple readings drop below 113°F. Heating continues until the water entering the HPWHs reaches 122°F. Photographs The following photographs illustrate the DHW system, including the HPWHs, piping, storage tanks, mixers, controls, backup boiler equipment, temperature sensors and flow meters. Figure 2. Sanden HPWHs After Pipe Insulation (CU-1, 2, 3 and 4) BONNEVILLE POWER ADMINISTRATION 7PDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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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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