July 10, 2012
Many people are confused about the role of the air source heat pump buffer water tank? Should a buffer water tank be installed? Leomon heat pump technicians believe that the buffer water tank is a necessity for the system and cannot be missing, because it is crucial to the entire system. Let's focus on it below.
1. If the buffer water tank is not used, the air source heat pump host will start and stop frequently.
Due to the limited amount of circulating water in the loop, it will reach the design temperature in a very short time, and the host will stop working. Then, in a very short time, the water temperature will reach the start-up conditions of the host, and the host will start again. Such frequent starts will greatly reduce the service life of the air source heat pump and waste electricity. Because the heat pump consumes the most electricity when starting, adding a buffer water tank is equivalent to increasing the system energy, the temperature change of the system is stable, the number of starts of the air source heat pump is naturally reduced, and the service life is greatly extended.
Especially in the new rural heating equipment project, I still recommend that the buffer water tank can be appropriately enlarged, and the effect is quite obvious. Originally, a machine was installed in the countryside, and a very small buffer water tank of about 50 liters was installed. As a result, the power consumption was amazing, consuming 50 degrees of electricity every day.
Looking at the site, it was found that because the wall was not insulated, the end used a fan disk. Once the fan disk was turned on, the system cooled down and the heat pump started. Because it was equipped with a 5HP air source heat pump, once it was started, the heat pump immediately reached the design temperature and stopped immediately. Such frequent starts caused serious waste of electricity. Later, a 200-liter water tank was added, and the average start-up reached more than an hour, greatly reducing the cost. The same is true for a device we installed ourselves. A 5HP air source heat pump was installed in a 137-square-meter residential building as a test. After adding a buffer water tank, it was basically started once every half an hour. Last year, the extremely cold weather consumed about 25 degrees per square meter.
2. Using a buffer water tank can defrost efficiently and in a short time.
When used in severe winter, especially between -3℃ and 5℃, the air source heat pump is obviously frosted, and the impact of defrosting on indoor temperature is a headache. Because the heat pump needs to consume the heat in the pipe during reverse cooling, if the water volume of the water system is small, the defrosting time will increase, and the water temperature in the pipe will be low, resulting in poor defrosting effect. If a buffer water tank is installed, then during the defrosting process, because the water tank has a certain temperature, defrosting can be completed in a short time, and the heat consumption is also small, avoiding the fluctuation of indoor temperature caused by heat pump defrosting, which is very important for stabilizing the terminal effect of the system.
3. Installing a buffer water tank can ensure the smooth flow of the system, complete automatic exhaust, and avoid heat pump failure.
We know that when the water tank is placed in the return water system, the circulating water enters from the upper part of the water tank and is discharged from the lower part. In this way, the gas in the water will accumulate in the upper space of the water tank. The pressure in the closed system will automatically force the gas to be discharged from the upper exhaust valve. In this way, the water outlet at the bottom of the buffer water tank is connected to the water inlet of the water tank because there is no gas, so it can not only protect the impeller of the water pump, but also make the system gas-free, ensuring the normal operation of the air source heat pump. If there is no buffer water tank, the presence of gas may cause the heat pump flow switch to malfunction and high-pressure alarm.
4. Installing a buffer water tank can make the heat pump system drain more thoroughly and prevent system blockage.
There are a lot of impurities in our air source heat pump system. These impurities will slowly accumulate at the bottom of the buffer water tank through circulation. When passing through the Y-type filter, the water quality of the water pump will improve, thereby reducing the cleaning of the Y-type filter.
Final summary
Installing an air source heat pump buffer water tank is a necessity. If the buffer water tank is appropriately enlarged according to the actual situation, the buffer water tank will play the role of energy storage and become an energy storage tank.
