Self-correcting variable parameter fan coil temperature control method and special equipment

Abstract

The invention relates to a self-correcting variable parameter fan coil temperature control method and special equipment. A temperature control device composed of a coil fan loop, a coil water valve loop, a control panel and a controller is arranged, a return air temperature signal is acquired by virtue of a return air temperature signal, the return air temperature sensor inputs the detected signal into an analog input port of the controller, a set temperature is input into the controller by virtue of the control panel, the controller carries out PID (proportion integration differentiation) operation processing on the input set temperature and temperature signal data input by the return air temperature sensor by utilizing linear relation between Pt resistance and temperature variation, and then an operation result is taken as a control signal and is sent to a direct current brushless fan and a floating valve mechanism, thus the direct current brushless fan and the floating valve mechanism synchronously act. According to the invention, the floating valve mechanism is controlled by an output voltage signal of the controller, and the floating valve mechanism is slowly opened or closed by virtue of an electrically driven valve, thus flowing around a target temperature value and oscillation can be avoided; and accuracy of control on a fan coil is improved, air quantity can be automatically or manually regulated, and the effect of saving energy can be obtained.

Description

Technical field [0001] The invention relates to a fan coil temperature control device, in particular to a self-correcting variable parameter fan coil temperature control method and a special device. It belongs to the technical field of air conditioning equipment. Background technique [0002] With the continuous development of the urban economy, people's pursuit of the quality of life is getting higher and higher. Central air-conditioning is used in various high-rise and low-rise buildings such as hotels, office buildings, office buildings, hospitals, apartments, and some entertainment venues. The end of the air-conditioning system is equipped with fan-coil equipment, and this equipment has a certain impact on the energy consumption of the entire air-conditioning system, and controlling the equipment has a certain positive significance for energy saving. According to the survey results on the use of the terminal equipment of the existing building air-conditioning system, most of...

AI Technical Summary

Problems solved by technology

For the traditional water valve control of fan coil units, two-way valves and solenoid valves are mainly used. There are only two states of on and off, and it is impossible to automatically adjust the flow of cold and hot media. The disadvantages of the use stability, the noise generated by the opening and closing operation, and the water hammer noise; for the control of the coil fan, there are only three wind speed adjustments of high, medium and low to realize the adjustment of the ambient temperature of the target area

However, due to the large thermal inertia in the control area, the water valve on-off control of the fan coil unit and the third-speed wind speed adjustment control of the fan coil unit will cause large temperature fluctuations.

[0003] In terms of system management and energy saving, due to the lack of perfect and effective management and control methods, it is very common for public buildings to set the indoor temperature unreasonably, keep the air conditioner running when there is no one in the room or when the doors and windows are open for a long time; the indoor environment parameters are manually set by the user , the wind speed is manually selected, that is, the operation control of the fan coil unit depends entirely on the user's manual operation

Since the fan coil at the end of the central air-conditioning system basically operates independently, the existing coil fans do not have the function of information transmission, so the system lacks corresponding effective information, so that the control system can only control the fan coil through a simple shutdown control method The operation cannot carry out effective intelligent control and management

[0004] In addition, the thermostat in the prior art only simply controls the third-speed wind speed of the coil fan and the opening and closing state of the water valve, and cannot automatically adjust according to changes in actual parameters, which may easily cause the indoor temperature to be unstable at the control target temperature.

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