Antifreeze measures for air source heat pump in winter
Nov 29, 2024
- Strengthen the insulation effect of the pipeline. Pipe insulation is very important. The exposed water pipes will cool down when the external environment temperature drops.
- Do not cut off the power supply to the unit. The air source heat pump of the water system uses water as the intermediate medium to transfer heat. Normally, the equipment has an antifreeze function. When the water temperature drops to a certain temperature, the equipment will automatically start to prevent the equipment and pipelines from freezing.
- Condensate 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, the condensate will flow to the ground through the pipe. If the temperature is below zero, the condensate will easily freeze and may freeze the drain pipe, and then climb up along the drain pipe, finally causing the equipment to fail to operate normally. Clean the condensate regularly.
- Add ethanol alcohol to the system water solution, and add ethanol alcohol with a concentration of more than 90% or more than 95% to increase the antifreeze property. 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 antifreeze index is -1°C, and if 5 kg of alcohol is added, its antifreeze index is -5°C. When adding ethanol to the system for antifreeze, it should be noted that the amount should not exceed 40% of the total water volume of the system.
- Add antifreeze to the system, such as -15°C and -25°C antifreeze, but due to the high price of antifreeze, the initial investment cost will increase. When using antifreeze, be sure not to use cheap antifreeze, 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.
