Room-temperature control device and control method for constant-air-volume air-conditioning system

A technology of air conditioning system and control method, which is applied in the direction of heating and ventilation control system, heating and ventilation safety system, heating method, etc., which can solve the problems of large hysteresis, slow system response, poor indoor temperature control effect, etc., and achieve thermal hysteresis Small resistance, fast control response, and improved control effect

Inactive Publication Date: 2019-06-18
武汉捷高技术有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Using the control device and method of the present invention to precisely and robustly control the indoor temperature can avoid problems such as slow system response and large hysteresis when using traditional control methods,

Method used

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  • Room-temperature control device and control method for constant-air-volume air-conditioning system
  • Room-temperature control device and control method for constant-air-volume air-conditioning system
  • Room-temperature control device and control method for constant-air-volume air-conditioning system

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Embodiment Construction

[0043] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0044] Such as Figure 1~2 As shown, a method for controlling the room temperature of a constant air volume air conditioning system includes the following steps in sequence:

[0045] A. Preset expected return air temperature, system air supply volume, air-conditioned room volume V z and temperature value sampling period;

[0046] B. Collect return air temperature value T z , through the return air temperature value and the expected return air temperature value T z,set Calculate the indoor temperature tracking error;

[0047] C. Use return air temperature value Tz, supply air temperature value T s , system air volume v s , combined with the specific heat of air and air density to calculate the instantaneous sen...

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Abstract

The invention relates to a room-temperature control device and method for a constant-air-volume air-conditioning system. Indoor air is sucked into an air-conditioning unit through an air return pipe,subjected to temperature exchange through a surface air cooler, and then discharged from an air supply pipe through a fan, and air forms cyclic flowing; an air return temperature sensor on the air return pipe transmits the detected air return temperature signal to a room-temperature controller, an air supply temperature sensor on the air supply pipe transmits the detected real-time air supply temperature signal to the room-temperature controller; and the room-temperature controller calculates the final air supply temperature according to an air return temperature and an indoor load, and in combination with the real-time air supply temperature, and then sends an instruction to an electric adjustment water valve executer, so as to control the opening degree of the electric adjustment water valve executer, and then control the water inlet amount of the surface air cooler, so that the purpose of adjusting the indoor air temperature is achieved. By virtue of the room-temperature control device and method for the constant-air-volume air-conditioning system, accurate and robust control is carried out on the indoor temperature, the problems of slow response, serious hysteresis and the likeof traditional control method and system can be avoided, and the problem of poor temperature control effect is effectively solved.

Description

technical field [0001] The invention relates to the technical fields of building energy saving and air conditioning ventilation control, in particular to a room temperature control device and a control method for a constant air volume air conditioning system. Background technique [0002] In the central air-conditioning system, the constant air volume system is widely used in practical projects due to its simple system design and low cost, especially in some clean rooms with constant temperature and humidity, which have special requirements for the air supply volume, and the constant air volume system is usually used . [0003] In the constant air volume air conditioning system, the indoor temperature is usually not controlled or directly controlled through the adjustment of the water valve opening, that is, the proportional integral (PI) controller directly adjusts the water valve opening according to the return air temperature (room temperature). When using this control m...

Claims

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Application Information

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IPC IPC(8): F24F11/64F24F11/84F24F11/89F24F11/88F24F11/52
Inventor 阮长龙朱陆溪吴俊杰
Owner 武汉捷高技术有限公司
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