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The control system has a control physical quantity and a physical quantity target value; and is characterized in that: according to the physical quantity and the target value, the target value of the brine outlet temperature is calculated; and the brine control valve opening degree is adjusted to make the brine outlet temperature Reach the target value.

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The terminal heat exchange apparatus (3) is composed of control point temperature sensor (4), refrigerant outlet temperature sensor (9), refrigerant control valve (5), controller (6), heat exchanger (7) and fan (8).

The terminal heat exchange apparatus (3) restricts the flow quantity of refrigerant by the temperature of refrigerant outlet.

The pressure of the pump (2) is adjusted by the opening degree of the refrigerant control valve (5) of terminal heat exchange apparatus (3).

The transporting temperature of refrigerant is adjusted by the temperature of refrigerant outlet of said terminal heat exchange apparatus (3).

The flow head of the pump in the central air conditioner and the heat exchange capacity of the heat exchanger are generally selected according to the maximum load, and the margin is left.

However, in actual operation, the load rate is often low, so as shown in Figure 1, the end heat exchange equipment 3.

At present, a control system is generally installed, and the refrigerant control valve 5 may be a regulating valve or an on-off valve, and the controller 6 is based on the control point temperature sensor 4.

The deviation between the reading (usually indoor temperature or outlet temperature) and the set value, turn off (or turn off) the large (or open) brine control valve to adjust the refrigerant flow, and then adjust the heat transfer, so that the control point temperature reaches the set value or fluctuates around the set value.

Use variable frequency speed regulation or number adjustment to adapt its flow head to the system requirements.

At the same time, the coolant supply temperature is reset, and the cold heat source can also be reduced.

Power consumption.

However, in the prior art, the above adjustment does not have a perfect control model.

Constant, although the logic is simple and easy to implement, but because the systems flow and load changes are not consistent, resulting in end underflow or overcurrent.

Constant. Theoretically, the constant pressure difference should be set at the most unfavorable loop, but because the pipe network is complicated, the most unfavorable loop is not constant, and it is difficult to find the ideal constant pressure difference and pressure difference.

The heat exchange capacity at the end heat exchange equipment is insufficient.

A central air conditioning system that can simultaneously control the temperature difference between the air conditioner and the temperature of the supply and return water is disclosed.

The temperature difference between the inlet and outlet water flowing through the end device of the air conditioner and the water supply amount can be controlled to ensure that the water system allocates water according to the demand.

However, its solution is limited to the end heat exchange equipment, and there is no mention of an optimized implementation of the overall system.

And the end heat exchange equipment control system uses two temperature sensors, water inlet and outlet, which increases complexity and cost.

The technical problem mainly solved by the invention is that in the dynamic operation of the variable flow of the system, under the premise of satisfying the heat exchange amount of the end heat exchange device, the pump delivery pressure is maximized and improved (in the case of cooling, such as heating) Then reduce) the coolant delivery temperature.

A control system for a terminal heat exchange device in a central air conditioner that indirectly transfers heat through a refrigerant, comprising: a controller, a brine control valve.

The utility model is characterized in that: the opening degree of the brine control valve is adjustable; the refrigerant coolant outlet temperature sensor is provided; and the brine coolant outlet temperature is one of the control parameters, the opening of the brine control valve is adjusted; the controller has The communication interface and the coolant outlet temperature control parameters are given by the communication.

Chofu Air Conditioner Manual