The temperature drops rapidly, so the air energy heat pump should be well protected from freezing in winter

In recent days, there has been a heavy snowfall in many parts of the country There is no need to say more about the low temperature areas in the north Even Zhejiang, Jiangsu and other provinces along the Yangtze River have seen extremely rare heavy snow Snow capped, the scenery is naturally beautiful, so that people in the South feast their eyes However, the following low-temperature weather, but also brought trouble, air energy heat pump winter antifreeze work is particularly important 1、 Users of air energy heat pump should pay attention to two points in winter 1 Do not cut off the power of the main engine When the air source heat pump is used for heating, the temperature is usually low at night, and the temperature is high in the daytime or not at home Some users are likely to turn off the host in order to save power This is actually very dangerous, because the heat generated by the air source heat pump unit is transferred through water as the carrier If the power is cut off when it is used in a low temperature environment, the main engine is likely to be frozen The correct way is to set the set temperature of the unit to Zui low when the main engine is not needed to work, so that the unit can ensure the antifreeze function, which can effectively solve the problem of energy waste and unit antifreeze After a long passive power failure, the user should open the Union and valve to drain the water in the pipeline In this way, even if the power is cut off, it can also avoid freezing the pipeline and the host due to low temperature 2 Do not pile up sundries around the main engine The air source heat pump absorbs the heat in the air After vaporization by the evaporator, it is compressed into high-pressure gas by the compressor, and then enters the condenser for liquefaction The absorbed heat is transmitted to the heated water In this way, it continuously absorbs the heat from the low-temperature source and outputs the heated water, directly reaching the predetermined temperature If there are sundries around the main engine and the distance is relatively close, it will definitely affect the heat exchange effect Generally speaking, there is a distance of at least 80 cm around the main engine If the installation position is not well ventilated, it will affect the heating effect of the machine, so pay attention to cleaning more, and pay attention to that the main fan blows out cold air If there is debris blocking in the front, it will affect the emission of cold air, which will lead to the lack of heat in the air and affect the heat exchange effect Therefore, the Zui on the front of the fan is good, there is no barrier within 2 meters If it is too close, the cold air may be sent back to the host, so the heating effect is very low 2、 Case analysis of air energy heat pump case 1: there is a villa user who lives in an unusual place He went abroad for a holiday last winter and cut off all the electricity and did not drain water As a result, the machine froze out when he came back Analysis: the temperature in the north is low in winter, the inner plate of the unit is frozen out, and the system is scrapped after startup At this time, do not start the machine first, melt the ice first, let out the water, then cut off the heat exchanger on the water side, weld first with the welding gun, disconnect the heat exchanger system and other systems first, and then blow other systems with nitrogen to see if there is any water If there is any water, it must be dried first or exposed to the sun to ensure that there is no water in it, and then turn on the compressor If it can be turned on, it is OK Just replace the heat exchanger It's OK If the compressor is disconnected before the heat exchanger system is disconnected, it's likely that water will enter the compressor, and then the whole system will be scrapped Solution: there is also a way to deal with this situation It is to install an automatic valve, which will automatically open and drain the water when the power is off It's not expensive to install an automatic valve The better one is only about 200 yuan However, there are restrictions on this valve It's just to install it at the lower part of the pipeline Sometimes it's difficult to find the lower point of the Zui, especially when the end is warm Case 2: in a rural area, the machine was frozen in winter, so the engineer was asked to repair it in the past Analysis: the temperature is very low in winter, if the anti freezing is not good, it is easy to be frozen When the temperature of water is lower than 0 ℃, it will freeze When the water is frozen, the volume expands, and the expansion coefficient of pipeline and water is different Therefore, when the water temperature in pipeline is lower than 0 ℃, the pipeline may freeze When the ambient temperature is lower than 0 ℃ and the unit is not powered on or the unit is in standby state, the internal anti freezing protection fails There is also a case of power failure There are many power failures in northern rural areas When the ambient temperature is low, it will be more dangerous if it is more than 2 hours, but the owner will not tell you that it is power failure Solution: in this case, we will generally remove the heat exchanger of the machine and give it to the heat exchanger manufacturer for inspection Look at the shape of the sleeve and the heat exchanger If it is frosted, the shape of deformation is different If water enters, it is generally caused by power failure, and there will be rust spots inside The solution is similar to case 1 Ice must be melted first to drain water, and the machine can only be started after drying Case 3: a two unit unit is frozen in summer Analysis: if the temperature probe fails or is inserted in the wrong position during refrigeration, the machine will also be frozen Generally, the temperature we set is 12 ℃ and the outlet water temperature is 7 ℃ If the temperature is not correct, it is possible to achieve the effect that the main engine is still refrigerated, resulting in icing and other situations Or the water flow is not smooth The temperature probe is placed on the pipe The temperature of the pipe is high, and the plate change side will keep cooling and freeze, especially if there is a buffer water tank The temperature probe is in the water tank, and the water in the water tank will not flow, and the temperature is relatively high The plate change side will keep cooling and freeze, and the anti freezing performance of the plate change is worse, and it is easier to freeze 。 Solution: when the water flow is not smooth, generally we will install a water flow switch to detect the water flow If the water flow is not smooth, the machine will automatically stop working Hongxing air energy heat pump unit operates normally at - 25 ℃ What are the common anti freezing measures for air energy heat pump? 1 If the set water tank temperature is 45 ℃ or 55 ℃, when the water tank temperature reaches this temperature value, the main engine will stop working, if the end is not working, then the pipeline temperature will drop, when the temperature is too low, for example, 3 ℃, then the main engine control panel can automatically start the circulating water pump according to the set temperature value (3 ℃), to ensure that the pipeline will not be caused by low temperature Freezing conditions However, there is a disadvantage of this method When the position of the temperature probe is not good, there will be problems with the temperature There are also electronic products such as the temperature probe that sometimes fail When the measured temperature is different from the actual temperature, there will be misjudgment In addition, when the power is cut off, this method will not work 2 Use antifreeze Generally, before winter comes, the agent should remind the customer to pay attention to antifreeze, but sometimes the customer still won't pay attention So, sometimes we would advise customers to use antifreeze But antifreeze also has its disadvantages: first of all, its specific heat capacity is lower than that of water, the heat is less under the same volume, the wind blown out of the wind disk is smaller or the temperature of the floor is lower, in addition, the antifreeze heat dissipation is faster, which may also have a certain impact on the heating effect 3 Use electric tracing tape In the north, we used to do this when we made solar energy When the ambient temperature was low or the machine stopped working, we started the electric tracing belt, and when the pipe temperature reached a certain value, we automatically cut off the power Of course, this way also has the limitation of power failure.