Looking at the current domestic air source heat pump water heater project application examples, the most problems are mostly concentrated in the installation and use of less than 1 year, from the point of view of water consumption and most of them are concentrated in 10 tons of water within a single unit or two units as much. Host problems, control problems, tank design problems and so on. Enough to affect the user's confidence in the use of air-source heat pumps, in the long run is bound to affect the promotion and application of excellent products. Jinan Longpu New Energy Co., Ltd. as air Throughout the current domestic air source heat pump water heater project application examples, the most problems are mostly concentrated in the installation and use of less than 1 year, from the point of view of the amount of water and most of them are concentrated in 10 tons of water within a single unit or two units for more. Host problems, control problems, tank design problems and so on. Enough to affect the user's confidence in the use of air-source heat pumps, which in the long run is bound to affect the promotion and application of excellent products. Ltd. as a professional manufacturer of air-source heat pump water heaters, but also one of the earliest domestic heat pump R & D production and application of one of the manufacturers to the industrial development of the overall situation for the consideration of the current market for heat pumps in the bad products prone to faults and the reasons for the focus of the analysis. And puts forward the solution for the majority of businessmen in the future business to pay attention to learn from. Also called for manufacturers in the production of colleagues *** with the same up to correct the industry's unhealthy atmosphere, to avoid the application of the entire air-source heat pump water heaters fall into the hands of profit-oriented people, so that the development of air-source heat pump water heaters out of the quagmire, back to the right path. Symptom 1: set the water temperature can not be reached or the temperature rises slowly. However, some engineering units run more than the design time a lot of time still can not reach the water temperature, only barely direct use of hot water or even can not be used, the measured temperature at about 40 or lower, the system ring pumps keep ringing, the temperature does not see a rise. Diagnosis: air-source heat pump water heating unit water temperature is generally set between 50 ℃ ~ 60 ℃, occasionally higher than 60 ℃ below 65 ℃ also belongs to the permissible range, just operating conditions may affect the service life of the unit. The rise in water temperature must get heat from the outside world. Storage tank when the water temperature does not go up there will be two possibilities, on the one hand, the heat loss is large or equal to the inflow of heat, when the two are equal, the water temperature remains unchanged. Heat loss also includes two possibilities, one of which is not enough quality of insulation and the natural temperature difference is too large, the heat loss is serious, especially the tank manhole sealing is not tight insulation is not good or hidden insulation part is not good, the peripheral takeover of insulation and box insulation discontinuity will increase the loss of heat; the other heat loss of hot water outflow at the same time as the cold water replenishment. This heat loss often occurs in the design of the water tank, some customers require water for 24 hours uninterrupted, such as high traffic hotels, barber city and other water customers, cold water into the tank, hot water at any time. In the air-source heat pump water heater unit does not have a problem, once the weather suddenly turned cold, the unit from the air heat gain exponentially reduced, while the customer's use of hot water increased, which is retained in the tank heat is not enough, it is manifested as a difficulty in rising water temperatures, and even the phenomenon of cold water. On the other hand, it may be the host refrigerant heat carrying capacity is poor, resulting in a single ring effectively carry the heat exchange becomes less. One of the possibilities is that the refrigerant selection is not appropriate, air-source heat pump water heaters use refrigerant is different from the traditional air conditioning refrigerant, unique specific physical specific and chemical stability, which is one of the core of the heat pump technology. Part of the heat pump products on the market using refrigerant does not have this characteristic, in the case of external temperature reduction in the lack of power phenomenon is not surprising. Another possibility is that the refrigerant charge is low or partially leaked and becomes insufficient to carry heat. Regular manufacturers of air-source heat pump water heater products fixed-pressure quantitative refrigerant charge, before leaving the factory are tested one by one to ensure that the host compressor in a variety of working conditions have a more stable working capacity. The same batch of units sampling test single working condition before marking the certificate of conformity, factory date, number and so on. In the product transportation, there is not according to the labeling of the handling of the situation, so that the refrigerant part of the leakage loss, to achieve the effect of work, but also lead to the water temperature can not reach the design of the water temperature. Prescription 1: According to our diagnostic analysis should first check to see whether the daily water consumption is excessive, every 1kg of domestic water to rise 1 ℃ absorption of 1Kcal heat equivalent to 1.163?10-3KWh, both 1,000Kg of water to rise 1 degree, the need to absorb 1.163KWh of heat. Calculation formula: water (tons)? Temperature difference ℃?1.163/unit power Kw?COP value? Design working time (hours), for example: cold water temperature of 15 ℃, the water temperature is set to 55 ℃, the unit power 2.2KW, in the winter ambient temperature is lower, the COP value of 2 or so (the product manufacturer announced data), the project design of water consumption of 1 ton, then the unit working time of 11 hours
N when the frost stops. M, N in the design according to the actual meteorological conditions set up according to the national regulations: the time required for the heat pump machine frost does not exceed 20% of the total working time. 20% of the total working time. Heat pump host frost design, if a slight frost on the frost, resulting in frost loss of energy, if the frost is serious or even near the air outlet after the full blockage and then frost resulting in a long period of inefficient operation of the host, and even make the fan resistance to overload and burn the motor. So the design of frost and the technology used is the main aspect of the unit to solve the problem of frost. Prescription 5: Frost folding design scheme is an important symbol of the manufacturer's manufacturing level and design capability, professional manufacturers are different from non-professional manufacturers and have a set of reliable optimization program. Outdoor evaporator with double hydrophilic aluminum foil coating with excellent hydrophilic continuity and corrosion resistance, can better eliminate the water bridge phenomenon, shorten the frost time, increase the effective working time. The general non-professional manufacturers are more for the pursuit of price and cost, directly using ordinary air conditioning outdoor unit slightly modified as an outdoor host, does not have the above excellent properties, the corresponding frost effect is not known. Air source heat pump water heater technology is a set of thermal dynamics, microelectronics control technology and plumbing engineering technology in one systematic result. Without a complete set of specialized design and development, production, testing equipment, depending on a simple combination of several purchased parts transformation is not possible with air-source heat pump water heaters should have the performance. The current domestic market in the air source heat pump water heater market is booming. Manufacturers are also mixed, the quality of products vary, the design of the seller, the level of service also varies, coupled with some businessmen in a hurry, resulting in a number of engineering problems. Users should on the one hand, try to choose a good reputation for professional business procurement, but also to examine the manufacturer's R & D capabilities, production history, quality certification and production standards for the record. Selection and use of enhanced scientific and technological awareness, awareness of rights, most of the problems can be avoided, after all, air-source heat pump water heaters in Europe and the United States developed countries have occupied half of the hot water equipment. I believe that the application of air source heat pump water heater in China will also be faster and wider.MechNet