A parallel loop mixed water heat exchange pid control system and its control method

Abstract

The invention provides a parallel loop mixed water heat exchange PID control system and its control method, including a controller connected through a signal line, a temperature acquisition module, a pressure difference acquisition module and an electric regulating valve control module, and the entire water circulation in the system includes One main line and two parallel branch lines form parallel water mixing parallel loop Ⅰ and parallel loop Ⅱ. The two parallel branch lines are equipped with separate cooling or heating equipment, temperature sensors and electric regulating valves, of which the parallel loop Road Ⅰ requires an energy loop for mixed water heat exchange, and parallel loop Ⅱ provides an energy loop for mixed water heat exchange. The main line of the water line is equipped with a mixing temperature sensor, a circulating water pump, and energy-consuming equipment. The electric control valves of the two parallel loops of the present invention are adjusted according to different adjustment targets, avoiding mutual interference and disorderly repeated adjustment when adjusting according to one adjustment target, so that there are fewer adjustment rounds, and the adjustment time is short and the adjustment accuracy is high. High, conducive to the advantages of control system programming.

Description

technical field [0001] The invention belongs to the field of fluid mechanics calculation and fluid control, and in particular relates to a parallel loop mixed water heat exchange PID control system and its control method, especially when IDC and electronic industries adopt natural cold source and electric refrigeration coupled cooling system. Water heat exchange PID control system and control method thereof. Background technique [0002] Parallel loop mixed water heat exchange is widely used in closed circulation systems such as air conditioning, refrigeration and heating. Mixed water heat exchange is a technology with broad application prospects because of its high heat exchange efficiency and low initial investment. The control of the mixed water heat transfer in the parallel loop is the key to the normal operation of the mixed water heat transfer. The control content of mixed water heat exchange is mainly the adjustment of mixing water ratio. [0003] The existing para...

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Problems solved by technology

According to the above research, the present invention intends to design a PID control system and its control method that can quickly and accurately adjust the mixed water heat exchange in parallel loops, so as to solve the existing problems in the prior art (1) mutual interference between two control valves and the fitting time Long, many adjustment rounds; (2) Low adjustment accuracy; (3) The pressure difference at both ends of the parallel loop is uncertain, and the combination of the two adjustment valve openings is not unique, which is not conducive to programming; (4) After the adjustment is completed The pressure difference at both ends of the parallel loop is not the minimum value, resulting in technical problems such as high lift of the circulating water pump and high power consumption

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