An online optimization method for the outlet water temperature of the secondary side of the central air-conditioning chilled water heat exchanger

Abstract

The invention discloses an online optimization method for the secondary side water outlet temperature of a central air-conditioning chilled water heat exchanger. The online optimization method comprises the steps of (1) acquiring the temperature data and cooling load data measured in a central air-conditioning chilled water distribution system at the current moment online; (2) setting the search range and the search step size of the secondary side water outlet temperature set value of the heat exchanger and generating all possible alternative temperature set values at the next moment; (3) establishing a prediction model, calculating the operation energy consumption of a primary side water pump of the heat exchanger and the operation energy consumption of a secondary side water pump of theheat exchanger respectively and adding the operation energy consumption of the primary side water pump of the heat exchanger and the operation energy consumption of the secondary side water pump of the heat exchanger together to obtain the total energy consumption of the water pumps; and (4) determining the optimal secondary side temperature set value of the heat exchanger at the next moment, andminimizing the total energy consumption of the primary side water pump and the secondary side water pump of the heat exchanger. By establishing the prediction model, online optimizing the set value of the secondary side chilled water outlet temperature of the heat exchanger under the current cooling load working condition and minimizing the operation energy consumption of the chilled water pumpson the two sides of the heat exchanger, energy-saving operation of a central air-conditioning system is realized.

Description

technical field [0001] The invention relates to the technical field of central air-conditioning in buildings, in particular to an online optimization method for outlet water temperature on the secondary side of a central air-conditioning chilled water heat exchanger. Background technique [0002] At present, in the design of the central air-conditioning chilled water system of high-rise buildings, in order to avoid the high static pressure caused by the vertical to be divided into not less than two subsystems. A heat exchanger (such as a plate heat exchanger) is generally used for cooling exchange between the two subsystems, and the primary side and secondary side chilled water pumps are installed on both sides of the heat exchanger. figure 1 It is a typical chilled water transmission and distribution system for central air-conditioning with heat exchangers. Both the primary side water pump and the secondary side water pump of the heat exchanger operate at variable speeds. ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and propose an online optimization method for the outlet water temperature of the secondary side of the central air-conditioning chilled water heat exchanger, which breaks through the partial load work caused by the use of fixed temperature setting values ​​in the traditional control method. In order to solve the problem of low energy efficiency of the water pump in operation, by establishing a prediction model, the optimal setting value of the chilled water outlet temperature on the secondary side of the heat exchanger under the current cooling load condition is calculated online to minimize the cooling effect on both sides of the heat exchanger. The running energy consumption of the water pump

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