What role does the buffer tank play in the heat pump system?

What role does the buffer tank play in the heat pump system? How to choose the appropriate buffer tank capacity?

If the air source heat pump system is equipped with a buffer water tank, the defrosting can be completed in a short time due to a certain temperature in the water tank during the defrosting process, and the heat consumption is small, which avoids the fluctuation of the indoor temperature caused by the main machine defrosting, and ensures the stable operation of the system.

There are two ways to install the buffer tank in the heat pump hot water water system. There is a name in the system – coupling tank, which mainly solves the problem of hydraulic balance of the system. Different circulating pipelines are separated in the system to make all circulating pipelines interconnected. The selection of the capacity of the buffer tank makes the efficiency of the system reach the height of stable water flow, and the selection of the buffer tank system needs to ensure the small water flow of the system, It is generally recommended that the capacity of the buffer tank of the main system is slightly less than that of the buffer tank of the auxiliary system.

The cooling capacity of the main engine (range: 3-5 L/KW) can be selected according to the experience value. The buffer slot is the same as the connection slot. The buffer tank can be understood as a large coupling tank. It can not only separate the primary system from the secondary system, but also store domestic hot water. When the buffer tank is installed, the gas in the system will continue to accumulate in the upper part of the buffer tank, and then automatically exhaust through the exhaust valve on the upper part of the buffer tank. The exhaust effect is obvious to ensure the normal operation of the system.