【 Weak current College 】 water source heat pump operating principle

Water source heat pump technology is the use of shallow water on the Earth's surface, such as groundwater, rivers and lakes in the absorption of solar and geothermal energy and formed by low temperature heat energy resources and the principle of using heat pumps, through a small number of high power transmission, low heat energy to high heat transfer of technology. Ground water-source heat pump system for low level the heat source is from wells or abandoned mine in groundwater. Heat pump units in winter from the production wells supplied heat absorption in groundwater, improve quality, building heating, low heat transfer in a heat source to need heating and humidifying, heat after recharging wells back to groundwater by underground. In summer, the production and Reinjection wells Exchange and indoor heat transfer to low heat, reach the purpose of cooling or refrigeration, usually water source heat pumps consume energy, 1kW users can get more than heat 4kW or cold.
Due to the deeper strata are not affected by the interference of atmospheric temperature changes, it can maintain a constant temperature all year round, well above the outdoor air temperature in winter, or lower than the temperature of outside air in the summer, and have a higher heat capacity, groundwater heat pump system for high-efficiency ratio of air-source heat pumps, the COP value is generally between 3 and 4.5 and frosting does not exist. In addition, the winter through the heat pump absorbs the heat of the Earth to improve the air temperature on building heating and temperature decrease in the Earth, that is, the amount of energy saved a cold for summer use; summer through the heat pump to heat a building is transferred to the Earth, on building cool while keeping the heat energy in the Earth for winter use. Thus, in ground water-source heat pump system greatly played the role of the accumulator and further improve the conditioning system energy use efficiency. And boiler (electricity, fuel) and air-source heat pump for heating systems, water source heat pumps have a distinct advantage. Boiler heating only 90%-98% of the power or 70-90% of the fuel energy into heat, available to users, so the heat pump to
Than electric boiler heating savings of more than two thirds of the energy savings than fuel boiler half of energy; as the water source heat pump heat temperature year-round more stable, usually 10-259C, refrigeration, heating coefficient 3.5 ~ 4.4, and compared with traditional air-source heat pump, up to 40% of its operating expenses for General conditioning of 5060% o
Water source heat pump based on water use, can be divided into a closed system and two open system. If you are a good water quality, groundwater can directly into the human heat pump to heat, this system we call open-loop. Practical engineering more adoption of closed-loop form of heat pump water circulation system, that is, a heat exchanger to groundwater and through heat pump cycle water separated to prevent groundwater and sediment and corrosive impurities on the effect of the heat pump unit.
Ground water-source heat pump system for domestic hot water can also be output, its waterway connections generally has four. The simplest way to have the air conditioning water systems and domestic hot water system completely separate and associated and well water system cascade connection of these two, but the former condensing temperature difference is too small, the latter cannot resolve the domestic hot water use water source heat pump unit outages air-conditioning system capacity decrease. It is based on the latter increased electric three-way valve, which not only reduces the installed capacity, reducing the initial investment, and the unit of configuration are more reasonable, improves the system's total energy efficiency ratio. In addition, there are still a hot water heat recovery water source heat pump unit are connected. After two ways to take full advantage of the water, energy and recycling of air conditioning system by condensation heat to the preparation of domestic hot water, so that the whole system of improved energy efficiency ratio, the more reasonable, energy-saving.
National groundwater recharge basically uses the original artificial recharge, mainly divided into pressure recharge and vacuum recharge two. Pressure recharge for high water and low permeability of aquifers, also suitable for low water level and permeability good underground aquifers; and vacuum recharge only applies to the low water level and permeability good aquifers. Now the domestic most systems are vacuum recharge of groundwater recharge. In addition, the domestic usually back to Jan and clean way to maintain groundwater recharge. Back to Jan times and return the time as raising the aquifer water permeability, second in size to consider well the features, quality, quantity and recirculation technology and recharging. These are very specialized, greatly increases user maintenance workload and the damage to the shaft, will cause the service life of the system.