Energy-saving control method for water side equipment of air-conditioning system

Abstract

The invention discloses an energy-saving control method for water side equipment of an air-conditioning system, which is used for carrying out energy-saving control aiming at the water side equipment of the air-conditioning system. The water side equipment of the air-conditioning system comprises at least one ice water host, at least one water cooling tower and a plurality of water pumps. The method comprises the following steps: carrying out regression analysis of the power consumption performance of the ice water host; carrying out regression analysis of the performance of the water cooling tower; carrying out regression analysis of the operating performance of the water pumps; carrying out system establishment and numerical value optimization calculation; and carrying out control according to each operation parameter, and carrying out data feedback and verification of the operating date after control. The energy-saving control method of the invention can establish an energy-saving control mode of the water side equipment of the air-conditioning system through a regression analysis model and an optimization algorithm, and simultaneously has the advantages of consideration of energy consumption of the whole system, automatic feedback control, self-correction of coefficients and no need of additionally developing hardware equipment.

Description

technical field [0001] The invention relates to an energy-saving control method for water-side equipment of an air-conditioning system, in particular to a water-side equipment such as ice water hosts, cooling towers, and water pumps, which uses an optimization algorithm to calculate the best energy consumption state of each equipment in the overall air-conditioning system According to the operating parameters under the control system, and then adjust the operating status of each device to obtain a control method that optimizes the overall energy-saving effect. Background technique [0002] As far as public places such as office buildings, department stores, factories, stores, stations, airports, and restaurants are concerned, the air-conditioning systems used are almost always based on chilled water host systems; according to statistics, during peak power consumption hours in summer , the electricity consumption of the air-conditioning system accounts for about 60% of the to...

AI Technical Summary

Problems solved by technology

[0008] 1. At present, regardless of whether energy-saving projects are carried out in domestic air-conditioning systems, most of them are controlled by manual operation and adjustment, and the dynamic air-conditioning load and external air changes cannot be kept up by humans at any time;

[0009] 2. The chilled water host group does not perform correct unloading and distribution according to the actual load of the system, or the chilled water hosts are switched on and off based on the average distribution calculation; or the system load (Q sys ) to do power consumption (P sys ) to minimize the numerical analysis to allocate the unloading volume (PLRi) of n hosts, and due to the complexity of the unloading volume control of each brand, no automatic practice is performed, such as

At present, there is a method of running at a fixed cooling tower fan speed, which can only eliminate the power consumption caused by over-specified design; or a method of trying to obtain the lowest possible approach temperature by using the wet bulb temperature, which causes the main engine The power consumption of the cooling tower is reduced but the power consumption of the cooling tower is increased, so that the combined power consumption does not decrease; or there is regression fitting based on the performance curve of the chilled water host and the external air wet bulb temperature conditions to calculate the minimum power consumption Electricity method, but this method does not have the group operation analysis and control of the performance characteristics of different brands of equipment to obtain the lowest power consumption for the real overall operation;

[0015] 5. The power consumption of the chilled water pump is inferior to that of the chilled water main unit. Nowadays, it is common to install a differential pressure gauge on the most remote air-conditioning equipment such as an air conditioner (Air Handling Unit, AHU), an external air processor (Make_up Air Unit, MAU), etc. At the same time, trying to reduce the load of the water pump by using a fixed set pressure difference with the frequency converter often fails to meet the actual dynamic load requirements because the set value is too small, and increasing the set value in order to avoid this problem will result in discounted energy saving results The problem;

[0017] 7. There is no overall system concept for energy saving. For example, if individual high-efficiency equipment is used, although individual equipment achieves the lowest energy consumption, it may not be able to achieve the lowest overall energy consumption under the operation of other equipment;

[0018] 8. Lack of an integrated energy management system, and only independently conduct power consumption analysis and management control on individual devices

Images