Guangxi Zhengxu New Energy Technology Co., Ltd. is a professional company fully committed to the new energy industry and equipped with product research and development, promotion, design, implementation and technical services. Address: Floor, Dajiahui Building Materials Home Building, Kunlun Avenue, Nanning City Tel: - Mobile: The company mainly undertakes: vacuum tube/flat panel solar water heaters, air energy heat pump water heaters, floor heating, heat pump drying, variable frequency water supply and other new energy products. Especially in the solar combined heat pump, it has unique characteristics. These engineering equipment are mainly widely used in hotels, hotels, schools, hospitals, residential quarters, apartments, villas, industrial and mining enterprises and institutions.
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. Winter heating mode (domestic hot water is lower than the set temperature ℃ and domestic hot water needs to be heated): Solenoid valve r at the compressor exhaust port is closed and blocked r domestic hot water The solenoid valve r of the heat exchanger opens r expansion valve r surface cooler (evaporator) r four-way valve r returns suction air to the compressor.
.Winter heating mode (domestic hot water reaches the set temperature): solenoid valve r at the compressor exhaust port is opened (domestic hot water condensation pressure is higher than the heating condenser pressure) r four-way valve r heating heat exchange r Expansion valve r Surface cooler (evaporator) r Four-way valve r Return to compressor suction.
.Summer cooling mode (domestic hot water is lower than the set temperature °C and domestic hot water needs to be heated): solenoid valve r at the compressor exhaust port is closed and blocked r solenoid valve r at the domestic hot water heat exchanger is open r expansion Valve r Refrigeration heat exchanger r Four-way valve r Returns air to the compressor.
.Summer cooling mode (domestic hot water reaches the set temperature): solenoid valve r at the compressor exhaust port opens (domestic hot water condensation pressure is higher than the outdoor condenser pressure) r four-way valve r surface cooler ( Condenser) r Expansion valve r Refrigeration heat exchanger r Four-way valve r Return to compressor suction.
Advantages
Ordinary air-cooled heat pump units must release a large amount of condensation heat to the environment while cooling. This part of the heat intensifies the urban heat island effect. Taking a unit with a heating capacity of 100 ℃ as an example, it releases about kilocalories of heat into the air every hour. This heat can raise the water temperature by ℃ within an hour. Many such enterprises and institutions need domestic hot water all year round. If the triple-generation waste heat recovery technology is adopted, a large amount of domestic hot water heating costs will be saved every year.
At present, heat pump
manufacturers and well-known air-conditioning manufacturers have successfully developed air-cooled triple-generation products. This product can heat domestic hot water while cooling and heating, and can also operate each function independently. The triple-generation unit realizes full cooling in the cooling state. Heat recovery reduces initial investment costs.
Disadvantages
Units that usually use triple-generation technology mainly use their indoor air conditioning function, supplemented by their daily bathing and hot water functions. Heat pump units are generally selected according to room load. Compared with domestic hot water load, the unit works in cooling mode most of the time in summer. Used in heating domestic hot water mode for a short time including household triple water heaters.
Due to the different water quality in different regions, new water flows into the hot water heat exchanger for bathing every day, which places high requirements on the corrosion resistance of the heat exchanger. Many trigeneration units have caused water to enter the fluorine circuit due to corrosion penetration of the hot water heat exchanger for bathing. The system caused the entire air conditioning unit to be scrapped. If you want to eliminate the corrosion problem as much as possible, the condensation temperature of the secondary heat exchange system for bathing hot water will inevitably increase by about ℃ and the aggravation value will be reduced.
. Domestic hot water temperature is generally set at around ℃ or even higher. This temperature can be regarded as the condensation temperature of the heat pump unit in domestic hot water mode.
Refrigeration mode: Taking Beijing as an example, the design condensation temperature of air conditioning in summer is about ℃. Traditional air conditioning units operate normally under this ambient temperature condition. It is no problem to switch to a three-generation unit to operate in cooling mode. When the hot water for bathing needs to be heated and the indoor temperature needs to be cooled, the condensing temperature must rise to ℃. The condensing temperature rises from ℃ to ℃. The condensing pressure increases to about. much higher than the air cooling temperature and pressure. Increasing the compression ratio increases power consumption.
In the air-conditioning refrigeration mode, getting hot water for bathing for free is actually partly (above the condensation temperature of ℃) obtained by increasing the condensation temperature and increasing the energy consumption of the compressor.
Conclusion
The concept of the heat pump triple-generation system is novel. When the so-called air-conditioning mode is running, hot water for bathing can be heated for free. Purchasing a set of triple-generation equipment can realize indoor cooling, heating and hot water for bathing. It can reduce part of the initial investment but the operating costs are the same as those of air conditioners plus air source heat pump water heaters.
The general operation of the trigeneration system is to first ensure that the bathing hot water temperature is cooled in summer. If the bathing hot water temperature and the indoor temperature do not reach the shutdown temperature, the domestic hot water heat exchanger serves as the condenser of the air conditioner and the bathing water temperature is below ℃. (because the outdoor temperature (condensing temperature) is higher than the water tank temperature in summer) the cooling mode is energy-saving. The hot water for bathing generally needs to rise to ℃ or even higher before it stops running. When operating at a temperature above ℃ ~ ℃, the refrigeration operation is not energy-saving.
Considering the potential danger (due to the domestic hot water corroding the heat exchanger and causing the entire system to paralyze), it is better to completely separate the air-source heat pump air conditioning part from the domestic hot water inside the unit. The fan can be used as a whole so that the system can interact with each other. Does not interfere with work stability.
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