Multi-mode water-fluorine multi-split air conditioning system

Abstract

The invention relates to the technical field of air conditioners, in particular to a multi-mode water-fluorine multi-split air conditioning system. The system comprises refrigerant circulation loops, outdoor heat exchangers and indoor heat exchangers of a plurality of air conditioning units, a first circulation loop, a second circulation loop and a main heat exchanger. The first circulation loop and the second circulation loop exchange heat with each other through the main heat exchanger, second medium channels are further arranged in the outdoor heat exchangers and the indoor heat exchangers respectively, and the first circulation loop and the second circulation loop can pass through the second medium channels, and exchange heat with first medium channels and / or first air channels in the outdoor heat exchangers and the second medium channels and / or second air channels in the indoor heat exchangers. According to the system, efficient utilization of natural energy, energy recovery, defrosting and free dispatching of cold and heat among all the systems can be achieved, the operation efficiency under the small load is improved, and it is ensured that the air conditioning system can stably and efficiently operate all the year round.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a multi-mode water-fluorine multi-connection system. Background technique [0002] Energy expenditure and greenhouse gas emissions related to building operation account for about one-third of the total amount of the whole society. Among them, heating, ventilation, air conditioning and domestic hot water account for more than two-thirds of energy consumption, which are the most important components of building energy consumption. And with the improvement of building functions and people's demand for comfort, the proportion of energy consumption is increasing year by year. Therefore, improving the energy efficiency of the air conditioning system is an important way to reduce the total energy consumption of the society and realize energy saving and emission reduction. [0003] Air conditioning systems are mainly divided into two categories: centralized and decentralized. ...

AI Technical Summary

Problems solved by technology

That is, it is impossible to realize the operation mode of "defrosting when cooling with small load while some units are heating";

[0008] (2) Although the single water loop can be switched to two loops, and the outdoor heat exchanger is the water source, the internal unit can only have one water temperature at this time. If cooling is realized, it cannot supply heat to other non-operating units; If you don't heat, you can't cool the room

That is, the operation mode of "cooling with small load and heating with small load" cannot be realized;

[0009] (3) During the transition season, the typical scenario is that the water (ground) source can be directly used for cooling in the inner area, and the problem of small-load heating cannot be solved at this time

That is, it is impossible to realize the operation mode of "free cooling by natural energy while heating with small load";

[0010] (4) Referring to (3), it is also impossible to realize the mode of "small load heating while recovering evaporator cooling capacity for free cooling"

[0011] 2. All indoor heat exchangers of the system are connected in parallel on the same water loop at the same time. When cooling and heating are required at the same time, it is impossible to flexibly switch between the cooling and heating conditions of any indoor heat exchanger

[0012] 3. Only one water loop is used to connect all indoor heat exchangers and outdoor heat exchangers. When the parameters required by the indoor heat exchanger loop and the outdoor heat exchanger loop are different, the following defects will occur:

[0013] (1) Although the system can divide the total water loop into the outdoor heat exchanger water loop and the indoor heat exchanger water loop through the opening and closing of the valve, the two cannot directly exchange heat to make full use of the outdoor heat exchanger The energy of the water loop, that is, the natural energy is only connected to the loop on the outdoor heat exchanger side, and cannot be directly used on the indoor heat exchanger side;

[0014] (2) Since the natural energy is only connected to the outdoor side of the system, it cannot meet the needs of both indoor and outdoor loops using natural energy at the same time, that is, if multiple composite operating modes are required, the system cannot be implemented and executed , restricting the practicability and flexibility of practical applications

[0015] 4. When switching from a single water ring to two water rings, two constant pressure points are required, but only one constant pressure point is required when the water ring is combined into one water ring. It is necessary to set and switch the constant pressure point, resulting in unstable pressure in the system ; Moreover, the outdoor heat exchanger loop and the indoor heat exchanger loop of the system cannot use two kinds of refrigerants, for example, the outdoor heat exchanger loop uses antifreeze, and the indoor heat exchanger loop uses water to take into account both Advantages of antifreeze and heat transfer of a refrigerant

[0016] 5. The system only adopts the form of air end, and the indoor thermal comfort is poor during heating in winter, which can no longer meet people's increasing requirements for room comfort

[0017] Therefore, although the system of this prior art can realize cooling and heating schemes under various modes throughout the year, it is not the most suitable, energy-saving and reliable system under most energy demands.

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