With the large-scale promotion of the "coal-to-electricity" and "coal-to-clean energy" projects in northern China, the use of air source heat pumps for independent home heating has become one of the leading energy-saving, comfortable, clean and stable methods. In this paper, the installation method and installation essentials of buffer water tank in air source heat pump system are analyzed. 
1. Definition of buffer tank
The buffer water tank is the water cold storage technology of the air-conditioning system, which increases the water quality of the aggregate operation of the small system, and can effectively solve the problem of load fluctuation caused by the system being too small and the frequent start of the main engine, so as to prolong the life of the equipment and save energy and electricity.
Advantages of buffer tanks:
1. System exhaust function: it can store and continuously and effectively automatically remove the gas existing in the system.
2. Centralized control function: with a variety of functions such as frequency conversion, temperature, flow, pressure, and telecommunication, it can easily control the operating parts of the system.
3. A variety of energy application functions: it can effectively combine solar energy, boilers, waste heat and other energy sources for system use.
4. Energy storage buffer function: heat storage buffer function, reduce the frequent start and stop times of heat pump, and use valley electricity to store heat.
II. II. IIInstallation and debugging method of buffer water tank
Installation of each pipe interface and pipe joint of the buffer water tankThe pipe joint and the water tank are generally sealed with a raw material belt, and the sealing and installation with the raw material belt is simple and fast, but there are also disadvantages in the installation with the raw material belt, first of all, the service life of the raw material belt is not too long (generally 1 2 years will attenuate);Secondly, if the raw material belt is exposed to sunlight or rain for a long time, it will be easily damaged, and its sealing will be affectedThe third is that the installation level and installation Xi of the installer are not the same, and the quality of the installation seal is greatly affected by human factors.
Here, for the sealing and installation of threaded connections of our products, it is more reliable to use metal pipe thread sealant. Metal pipe thread sealant has the advantages of all-weather use, good sealing performance, high quality and heavy load, corrosion resistance, lubrication of pipelines, static conduction, easy disassembly and long service life (the service life of metal pipe liquid sealant can generally be the same life as the product).
Installation and arrangement of pipes and pipes connecting the buffer water tank and the system: For the connecting pipes and pipes, most of them use plastic pipes and fittings.
Valves installed directly in docking with the buffer water storage tank: Since the main engine and the end are operated and controlled independently, some control valves will be installed near the circulating interface end of the buffer water tank, such as manual gate valves, check valves or electric valves, etc.
These valves typically act as shut-off control on the main pipe of the system.
Installation of hanging buffer storage tanksRestricted by the installation area or conditions, part of the house type installation buffer storage tank must take the wall-mounted installation mode, the installation of the wall-mounted buffer tank, the fixation of the water tank on the wall is particularly important, if the wall is reinforced concrete pouring, as long as two expansion bolts can be installed directly, but the wall of many houses can not meet the bearing requirements after the tank is filled with water, in this case, the installation mode of these two different walls can be recommended:
The first way: the wall-mounted buffer tank is installed on the ordinary brick wall, and the installation on the ordinary brick wall must consider the load-bearing capacity of the entire wall. This method is to first use two steel plates with a thickness greater than 5mm to inlay in the front and back walls, open the wall screw hole according to the hook center distance of the water tank installation hanger on the two steel plates, and then fix the two steel plates on the wall with the wall screws, and finally hang the water tank on the steel plate surface.
The second way: this installation method is for the installation area without load-bearing capacity such as sand and ash or earth wall, in which case the installation frame can only be customized or the installation surface that meets the bearing requirements can be remade for installation. Therefore, for the wall-mounted buffer tank, the prerequisite is the bearing capacity of the installation surface or the mounting frame, and the operation stability of the water tank after installation and the convenience of subsequent maintenance should be considered in the installation process.
Testing and commissioning
The test and commissioning after the installation of the buffer storage tank are mainly carried out in combination with the whole system, and no individual component or individual in the system can be operated or tested and debugged separately. After the complete installation of the water tank and the air source heat pump heating system, the trial operation can be carried out.
ThreeInstallation essentials
Pay attention to the selection of installation locationWhen installing, we should first pay attention to the selection of installation location, which is mainly divided into two parts, one is to combine the system requirements and the user's environmental conditionsSecond, it is necessary to meet the requirements of environmental protection and city appearance.
The pipeline joints should be matched according to the specifications, and all the pipe interfaces of the buffer tank are standard cylindrical pipe threads, and the pipeline joints that are matched and installed should be matched in strict accordance with the specifications. Now the quality of the cylindrical pipe threaded fittings purchased on the market is relatively messy, and the cylindrical pipe threaded fittings required by the national standard must be selected when choosing, only in this way can they coincide with the threads of the water tank products that come out of the factory.
In order to save installation costs, some installation units blindly pursue low-cost accessories, the quality of such accessories generally does not meet the requirements of the national standard, and the installer can only use the way of multi-winding raw material belt when installing. This is a practice that outweighs the cost, so when choosing such mounting accessories such as cylindrical pipe threads, it is important to choose fittings that meet the requirements.