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Heat Pumps for Heating and Cooling A reversing valve is an important part of heat pumps, allowing the system to operate either on a heating or cooling cycle. When a heating cycle is on, the reversing valve allows the refrigerant to flow from the compressor to the condenser (inside coil). When the cooling mode is on, the direction of the refrigerant flow is reversed. The defrost cycle in heat pumps requires a defrost thermostat and a defrost control device. The defrost thermostat is located outside, sensing the temperature. When the outside temperature is cold enough, the defrost thermostat closes and allows the operation of the defrost control device (or board). A defrost timer in the control board is activated in order to start the defrost cycle for a certain period of time or as long as there is frost on the system. The activation of the defrost timer energizes and activates the reversing valve to provide heat for the outside coil. The defrosting cycle can take from 1 to 10 minutes, depending on the present conditions. The defrosting cycle can be set to operate every 30, 60 or 90 minutes, in many applications. The main control box contains all necessary relays, starting and running capacitors, transformers, compressor contactors, etc. that are required in order to achieve adequate and safe operation of the heat pump. The main control box contains also the defrost control board. Summary Typically, when heating systems or appliances are compared, all costs (related to the purchase, installation, operation and maintenance of these systems) that are incurred can be combined into a life-cycle cost which is the cost of ownership over a period of years. The table below compares the various types of central heating systems: Compare Safety Installation Cost Operating Cost Maintenance Cost Life-Cycle Cost Combustion- Based Air Source Heat Pump A Concern Moderate Moderate Moderate High Moderate Moderate Excellent Moderate Moderate Geothermal or Ground-Source Heat Pump Excellent High Low Low Low ******* 86PDF Image | Heat Pumps for Heating and Cooling
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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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