Heat supply regulating and controlling method based on water mixing device

Abstract

The invention discloses a heat supply system based on a water mixing device. The water mixing device comprises a secondary circulating pump, a temperature sensor and a three-way electric valve, wherein a water inlet of the primary circulating pump is connected with a boiler, a water outlet of the primary circulating pump is connected with one end of a heat exchanger, the other end of the heat exchanger is connected with a water inlet of the water mixing device, a water outlet of the water mixing device is connected with a building heat radiator of a building to be supplied with heat, the temperature sensor is arranged in a room at the tail end of the building to be supplied with heat,, in which the heat supply system is,and a temperature signal acquired by the temperature sensor is associated with an electric valve of the heat supply system. According to the invention, heat supply regulation, constant-temperature PID (Proportion Integration Differentiation) control and the water mixing device are combined, namely, the water supply temperature is controlled by using the water mixing device, and the temperature in the room at the tail end is subjected to constant-temperature PID regulation for controlling the water supply flow.

Description

technical field [0001] The invention relates to the technical field of energy and energy saving, and is oriented to a heating system of a public building, in particular to a time-segmented heating adjustment and control method based on a water mixing device for the purpose of energy saving. Background technique [0002] In northern my country, most of the public buildings adopt centralized heating, which usually adopts an indirect heating system, that is, the primary network and the secondary network are separated and circulated. [0003] The heating mode of the secondary network of the indirect heating system can be divided into direct heating mode and mixed water mode. Direct heating means that the high-temperature water flowing out of the heat exchanger is directly delivered to the radiator of the end user; while the mixed water means that the low-temperature return water is introduced into the high-temperature supply water through the bypass pipe (see figure 1 , figur...

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Problems solved by technology

[0005] (1) The heating of public buildings has a strong time characteristic. The heat load of heating during working hours is relatively large, and only antifreeze protection is required for heating during non-working hours. However, 24 Hours of full load operation, the energy waste is very serious;

[0006] (2) Even if some heating systems have adjusted the heat supply in different time periods according to the time characteristics, due to the difference in outdoor temperature, the time for the indoor temperature to rise to the design temperature is not the same. The time period and heat preservation time period are fixed, which does not meet the heating characteristics;

[0007] (3) For the heat preservation period, a small flow of hot water supply is usually used to realize the antifreeze protection function, and when the indoor temperature is high and there is no one in the room, continuing to supply heat is a waste of heat;

[0008] (4) Part of the heating system adopts low-flow anti-freezing operation at night, but the determination of the minimum anti-freezing flow often adopts empirical methods without sufficient theoretical basis;

For the heating period, most of them use manual methods to achieve outdoor temperature compensation. Even if automatic methods are adopted, only the usual compensation and adjustment methods are adopted, mainly including quality adjustment (large power consumption), quantity adjustment (extremely poor hydraulic stability ), quality regulation and mass flow regulation of step-by-step variable flow rate (combining the above advantages and disadvantages, a relatively moderate method), the above-mentioned regulation methods have disadvantages, and are not suitable for heating regulation in different regions with diverse climates

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