People are starting to use the country's air - Dongguan air to water heaters - air heat pump ..

Heat pump principle and its application describes the selection of air source heat pump heat pump because of its advantages of energy saving, environmental protection, and heating and cooling cogeneration, etc., now widely used in the country. Relevant issues are summarized as follows: air source (air) pump current products are domestic heat pump air conditioners, commercial air conditioning units and heat pump unit water heat pump. Heat pump air conditioners accounts for 40% to 50% of household air-conditioner sales, the annual output of more than 400 million units. Water heat pump since the early 1990s, in the hot summer and cold winter area has been widely used, according to incomplete statistics, in the area of ??air conditioning in some cities central heat pump hot water unit has accounted for 20 to 30% and the range of applications continues to expand and have a tendency to move towards this. 1, on the air source heat pump energy evaluation in order to evaluate and compare the energy consumption of heat pump and other heating and cooling equipment, about 30 papers related to this issue. Introduces the theory and software for heat pump energy analysis, according to the cooling load, the outdoor dry bulb temperature, the heat pump water temperature and other parameters, the use of temperature frequency method, to solve the heat pump cooling annual energy consumption. When solving the heat pump in energy consumption, in addition to considering the heat load air conditioning, heat pump water temperature, outdoor dry bulb temperature, but also the outdoor relative humidity (ie, frequency and humidity) taking into account the heat pump performance, the software by engineering calculation, and with The actual energy consumption are in good agreement for the energy evaluation provides a way. 2, use air-cooled heat pump units of the current design use air-cooled heat pump chiller, often based cooling and heating loads calculated, taking into account at the same time after the coefficients and cold (heat) loss factor, according to the unit nameplate value selection unit Number of units . Since the production of air source heat pump cold (hot) with the amount of change outside the parameters change, this selection method may result in the unit selected too large, resulting in waste; or selected too small, so cooling (heat) is less than the amount not up to the requirements. This proposal by the use of hot and cold air conditioning hourly load and heat pump heating and cooling capacity of the curve when the choice of control, will be quite satisfied with the result. 3, heat pump air source heat pump defrost winter winter heating run, the biggest problem is that when the outdoor temperature is low, the outdoor heat exchanger fin surface will be frost (defrost measures need to be taken). According to the literature excerpts, field-tracking test for two years, with the result that the heat pump defrosting loss account for 10.2% of the total energy loss, and because the issue defrost control method, about 27% of the defrost function is in the fin surface frost is not serious, without the need to enter the defrost defrost cycle. At present, some commonly used methods, more or less there are some problems, such as excess defrosting action occurs, or need defrosting without signaling the presence of other ills. Best defrost time control and literature proposed maximum average for calorie control defrosting method, in theory very innovative, but more difficult to achieve. Using self-adjusting die burnt basic structure ideas and defrost control system to determine the indoor and outdoor air temperature, relative humidity difference and the rate of change of the fin temperature domain as input by the input amount of mold and die burnt burnt reasoning methods to achieve burnt defrost control mode simulation machine at a high level, using this method defrosting by comparison with experimental data, the discrimination results agree well with the actual situation. This method is compared with the conventional defrosting methods, not only to extend the heating working hours, reducing the defrost times and defrost losses, but the unit performance and reliability has been improved. In areas with low outdoor air temperature, due to the heat in winter for lack of heat, you need to set up an auxiliary heater. Common method is provided at the outlet of the indoor unit heater, this method is not only low thermal efficiency, poor safety performance and defrost for a long time, a large indoor temperature drops, the use of Freon heater can significantly overcome these shortcomings, this approach When the indoor side heat exchanger is divided into two parts before and after, in the middle of adding an auxiliary heater Freon that run in the winter when the heat pump, compressor discharge temperature Leone chlorine gas into the front portion of the indoor heat exchanger has been part of the gas is condensed into a liquid. At this point the heated freon heater, so that part of the liquid evaporates into gas again, and then into the second half of the indoor heat exchanger. Thus, relying on the entire indoor heat exchanger, the heat absorbed by the outdoor heat exchanger, together with the heat generated by the heater freon air-conditioned room to pass together, make up for the lack of heat due to the outdoor ambient temperature is low and caused . Related documents introduced at trial KFRd-70LW heat pump air conditioners, has been very good auxiliary heating effect, and defrost time reduced from 3min to 1min (when the outdoor temperature -1 ℃); reduced to the 10min 3min (outdoor temperature -7 ℃ pm). 4. The heat pump's noise control noise control single or multiple heat pump units. Noise propagation characteristics analysis of air source heat pump, heat pump combined with noise control engineering examples, describes the design method enclosed muffler and insulation device design features and control effect. Since the air-cooled heat pump operation, management and maintenance more convenient, so it has a dual function heating and cooling, heat units and does not require cooling towers, and therefore, more and more applications. But the noise of the heat pump is easy to have some impact on the environment in recent years, the heat pump noise nuisance increased incidents Shanghai and other places, has become a universal stationary sources of noise pollution in a class with a recent city. Therefore, understanding the noise propagation characteristics of single or multiple heat pump, heat pump explore ways noise control group, with a certain universal significance. From the noise source heat pump, the noise, noise control instance, a technical point of heat pump noise control and governance, the heat pump noise control engineering instance has some promotional value and meaning, in the preferred solution to the ventilation heat pump , into the exhaust problem, make sure that the premise of the normal operation of the heat pump, a fully enclosed muffler and insulation means to reduce the noise of the heat pump A sound level of about 20dB, a degree in some special occasions to the need to reduce the noise of the heat pump Noise Control Engineering design provides a successful example can learn, especially in the heat of the exhaust residual pressure is low or do not understand the specific residual pressure, in the inlet exhaust system design muffler and insulation means may have a specific calculation basis.