At present, the north has entered the heating period of the new season. As the temperature drops, ensuring heating has become a top priority. Antifreeze measures for air source heat pump in winter, it can be carried out from the following aspects.
Heat pump antifreeze measures one: Strengthen the insulation effect of the pipeline.
It is very important to keep the pipe warm, and the exposed water pipe will cool down when the external environment temperature drops. Those who have not kept the pipeline warm before should put on “clothing” for the pipeline as soon as possible. After wearing the clothes, the water pipe will be warm, and the water in the pipeline will not drop too much or too quickly.
The pipe insulation of air source heat pump heating is B1 grade 30mm thick outside, and American B1 grade 20mm thick indoor. (Black) The outer layer of outdoor thermal insulation is made of aluminum skin, and the outer layer of indoor thermal insulation is bound with white cable ties. Pipeline valves and bends must be well insulated to prevent the exposed points of the pipeline.
When heating pipes pass through the pipe section of the outdoor yard of the farmers, an insulation layer is required. Before the pipe insulation operation, the distance between the pipe and the wall and other pipes and equipment should be thoroughly checked. If the position is found to be insufficiently insulated, rectification should be made. When connecting between the pipe sleeve and the pipe sleeve, the end surface (circular seam) of the pipe sleeve must be coated with thermal insulation glue. The longitudinal seams of the pipe sleeve shall be staggered, and the longitudinal seams shall generally not be vertically downward. Seal the seams with glue. When connecting the pipe sleeve to the host and the wall, the end surface of the pipe sleeve and the end surface of the host and the wall must be coated with thermal insulation glue to press tightly.
2. Heat pump antifreeze measures two: Do not power off the unit
The air source heat pump heating of the water system uses water as an intermediate medium for heat transfer. Normally, the equipment has anti-freezing function. When the water temperature drops to a certain temperature, the equipment will automatically start to prevent the equipment and pipelines from freezing.
If the weather temperature is relatively low, once we cut off the power to the air energy heat pump when we go out, it may cause the water temperature in the pipeline to drop sharply. If the temperature is too low, the equipment may freeze and cause the equipment to malfunction. Therefore, when the heat pump unit is not running for a long time, such as: frequent power outages, shutdown of the unit at night, winter holidays, and infrequent use of the unit in winter, all water in the unit, water pump and outdoor pipeline should be drained to prevent the unit from freezing Bad.
3. Heat pump antifreeze measures three: Condensate water should be properly handled.
During the heating process of the air source heat pump, a large amount of condensate will be discharged. If there is a slight negligence in the discharge of condensate, then the condensate will be discharged through the pipe and will flow to the ground. If the temperature is below zero, the condensate will easily freeze, which may freeze the drain pipe and then drain along the drain As the pipe climbs upward, the equipment cannot operate normally, and the condensate must be cleaned regularly.
Therefore, the location of the condensate pipe must be reasonably designed. 1. The installation position of the main engine can be raised. Under normal circumstances, the height of the main engine from the ground should be no less than 30 cm. For areas with severe ice and snow, it is recommended to be at least 50 cm or more; 2. Add a heating cable to the main engine chassis to defrost and melt ice; 3. , Wrap the heating cable on the outer wall of the condensate water or defrost water drainage pipe to prevent freezing.
4. Heat pump antifreeze measures four: Open the three-way inlet and outlet, install the drain valve
When installing, install the drain valve and drain pipe at the lowest point of the water system. Even if it is not at the lowest point of the unit, a drain valve should be added to the inlet and outlet of the unit. When there is a power outage for more than two hours or a long-term shutdown, such as when the unit is not used frequently when you go out for a long time, open the drain valve at the water inlet and outlet to empty the rainwater in the main pump to prevent freezing and cracking after the temperature drops. Cut off the power. Then during operation, a comprehensive inspection of the air source heat pump system is required to ensure that there is no malfunction.
5.Heat pump antifreeze measures five: Add ethanol alcohol to the system aqueous solution
Add ethanol with a concentration of more than 90% or more than 95% to increase frost resistance. The amount to be added depends on the local minimum temperature. For example, if 1 kg of alcohol is added to 100 liters of water, its frost resistance index is -1℃, and when 5 kg of alcohol is added, it is -5℃. When using ethanol to add to the system for antifreeze, it should be noted that the amount cannot exceed 40% of the total water volume of the system.
In addition, ethanol has a drawback, which is relatively volatile. When the exhaust valve is installed in a relatively closed space, it is easy to cause the ethanol content in the space to exceed the standard. If it encounters an open flame, it may cause a fire. And because of the strong volatility of ethanol, it needs to be added after one or two years of use to maintain the original antifreeze performance.
6. Heat pump antifreeze measures six: Add antifreeze to the system.
For example, antifreeze at -15℃ and -25℃, but because the price of antifreeze is higher, it will increase the initial investment cost. When using antifreeze, you must be careful not to use cheap ones, such as methanol blended antifreeze, which is corrosive to the pipeline and will cause greater damage to valves, pipe fittings, water pumps, and unit heat exchangers.
7. Heat pump antifreeze measures seven: Clean up debris and snow around the heat pump in time
If the heat pump installation location is not well ventilated, it will affect the heating effect of the heat pump. Therefore, it is necessary to clean up more. It should also be noted that the host fan blows out cold air. If there is debris in the front, it will affect the cooling air discharge. This will lead to insufficient heat in the air and affect the heating effect. If the snow is too heavy, the snow must be cleared in time.