EVI DC Inverter Heat Pump System for Heating and Cooling
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With the continuous improvement of the requirements for environmental protection and energy conservation of heating equipment, air source heat pumps system, as the main force of the “coal to electricity” project, have sprung up. Although the equipment of air to water heat pump is the same, different installation companies adopt different installation methods. The installation system can be divided into primary system and secondary system. How should we understand these two systems? How to configure buffer water tank?
Split heat pump system for heating and cooling primary system:
In the air heat pump, after the household users install the built-in pump of the heat pump unit or the primary system to increase the water capacity of the system by increasing the system pipeline or adding the series buffer tank, the minimum water capacity of the system can be guaranteed (easy to start and save energy). It is recommended to use the primary system. After all, the primary system is simpler than the secondary system and easier to install. Since the installation location of household user equipment is not very large, and the initial purchase budget is not very high, the primary system is more suitable. There is only one circulating pump between the main engine and the end of the primary system,
In the primary system, the hot and cold water produced by the heat pump enters the fan coil or floor heating after being adjusted by the three-way reversing valve, and then returns to the heat pump unit after passing through the hot water buffer tank. The system is relatively simple in design, low in installation space requirements and low in cost. However, the primary water system of high-power heat pump host has a large head, which will lead to high energy consumption for long-term operation. When the end part is running, the heat pump is prone to flow alarm, and differential pressure bypass must be installed. This system is applicable to heat pump host with small water capacity and built-in large lift pump.
Split heat pump system for heating and cooling secondary system:
In the secondary system, the buffer water tank is located between the main engine and the end, and there is a circulating pump on both sides of the water tank, forming two water circuits of the main engine and the buffer water tank, and the buffer water tank and the end. The heat pump unit only cools or heats the buffer water tank. The flow is stable and the operating conditions are stable to ensure the long-term high efficiency operation of the unit.
The secondary system uses variable flow variable frequency pump, which can fully meet the demand of variable flow at the end, especially in the case of low opening rate and strong randomness. However, large installation space is required, and the cost is higher than that of primary system.
When our residential area is relatively large, the built-in pump of the heat pump unit and the water capacity of the lifting system still cannot meet the actual demand, or when the end is controlled by a separate room, and the two-way valve of the fan coil or the floor heating solenoid valve is partially opened, due to the change of the end flow load, the load of the heat pump host cannot form a correct match, so the secondary system is recommended. The cycle of heat pump host and water tank, and the cycle of water tank and end will not cause frequent startup and shutdown of heat pump host, maintain the stability of the system, and will also save more energy. Besides the compressor, the water pump is an accessory with high power consumption. The correct selection of the water pump through the secondary system can reduce the power consumption of the water pump.
What are the advantages of the primary system and the secondary system?
The structure of the primary system is simple and easy to construct. There is only one circulating pump, and the main engine is directly connected with the end through the pipeline. The design and construction are difficult, the installation cost is low, and the heat exchange efficiency is high.
The cost and energy consumption of the corresponding secondary system is higher than that of the primary system. Adding a buffer water tank and circulating pump, as well as increasing the complexity of the system, will increase the cost of materials, installation and use. However, the secondary system can reduce the frequent switching of the host due to water temperature changes, effectively prolong the service life of the heat pump host, and the secondary system will also be more stable and comfortable.
For system design, the primary system and the secondary system have their own advantages and disadvantages, so it is unnecessary to compare them. The primary system is more suitable for small heating places, and the secondary system is more suitable for large heating places, which can be selected according to the actual needs of users.
What is the difference between the heat pump buffer tank of the primary system and the secondary system of the dual supply system?
The heating buffer tank of heat pump of the primary system is installed on the main return pipe, so that the return water at the end of the water tank can be fully mixed with the water in the water tank before returning to the heat pump to achieve the buffer effect. The water tank with large diameter and low height is better, and the asymmetric two openings are selected, so the buffer effect will be better.
Both the water supply and return of the secondary system need to be connected to the water tank, so the water buffer tank generally has at least four openings. The water supply and return have a temperature difference. The water tank with a small diameter but a very high diameter needs to be selected, and an appropriate distance should be opened between the water supply and return, so that their temperatures do not affect each other.
summary
The reason why air to water heat pump can prevail in the heating market in a large area is due to its advantages of environmental protection, energy conservation, comfort, stability, safety, long life, etc. However, when designing and installing the system, we should also consider that the installation location of the equipment is not very large, and the budget for purchasing the equipment at the initial stage is not very high, so it is more appropriate to use the primary system. On the contrary, the installation location of the equipment is very spacious, and the budget for purchasing the equipment at the initial stage is sufficient, and it is more appropriate for users with large residential areas to use the secondary system. For the buffer water tank, it is better to use a large diameter and low height type for the primary system, and a small diameter and tall type for the secondary system. Of course, the specific situation is analyzed. All system designs must be designed according to the actual situation of users. The air energy heat pump needs professional designers to measure, calculate and plan, so as to provide users with the best design scheme. Of course, this also shows the professionalism of the air energy heat pump installation company.
Post time: Nov-26-2022