Energy-saving control method and system for sewage source heat pump system

Abstract

Provided are an energy-saving control method and system for a sewage source heat pump system. The method comprises the following steps that S1, a building standard cold and heat load prediction modelis established; S2, refine building partition is carried out according to the building standard cold and heat load prediction model, a cold and heat energy consumption need dynamic curve of sub-areasof a building is generated, and the dynamic curve is updated one time at intervals; and S3, facilities of the sewage source heat pump system respond to a command issued by a central mainframe in time,the sewage source heat pump system is divided into the facility starting phase, the steady-state operation phase and the facility shutdown phase according to the energy consumption need dynamic curve, in the steady-state operation phase, whether the temperature difference of a water inlet and outlet of a sewage source heat pump unit is within the set temperature range or not is judged, if yes, running is carried out in the set temperature difference range, and if no, variable-frequency adjustment is carried out on a corresponding water pump. The energy-saving control method and system for thesewage source heat pump system have the advantages of being efficient, stable, free of pollution, small in energy consumption, remarkable in energy saving effect and the like.

Description

technical field [0001] The invention relates to the field of energy-saving control of air conditioners, in particular to an energy-saving control method and system for a sewage source heat pump system based on big data, three-stage and fine partition control. Background technique [0002] Air-conditioning and heating equipment are the major households in building energy consumption, accounting for 40% to 50% of total building energy consumption, and Western developed countries account for 60% to 70%. It can be seen that the building energy saving potential is huge. [0003] At present, the design of the central air-conditioning system in the Chinese construction market is very rough, and there is a serious waste of energy. The specific manifestations are: ① Blindly using new energy technologies, not paying attention to the matching between the energy supply system and the energy-consuming system, resulting in poor operating effect of the entire air-conditioning system Poor,...

AI Technical Summary

Problems solved by technology

[0003] At present, the design of the central air-conditioning system in China's construction market is very rough, and there is a serious waste of energy. The specific manifestations are: ① Blindly using new energy technologies, not paying attention to the matching between the energy supply system and the energy-consuming system, resulting in poor operating effect of the entire air-conditioning system Poor, causing energy waste and unnecessary investment losses; ② The load estimation method is generally used in the initial design of central air-conditioning systems, and the extreme load is taken as the design basic data, and a 10% margin is generally added, resulting in an increase in equipment capacity of 20% % to 50%, the phenomenon of "big horses and small carts" appears; ③The central air-conditioning system fluctuates and operates under 70% load 90% of the time, while the existing central air-conditioning system is basically still in the state of manual start-stop control, without overall Optimizing the group control system leads to low operating efficiency of the units and pumps. At the same time, the full manual management mode makes operation and maintenance chaotic and increases labor costs

[0004] There are currently two main problems in system design based on cooling and heating load data: ① load calculation is inaccurate, and the selection of cooling and heating source systems is too large, resulting in waste of cost and energy; ② load is dynamically changing, temperature and The chilling / cooling water is a strong coupling relationship, and the variable frequency speed regulation technology of chillers, water pumps and fans has not been fully exploited. The only few local control systems are also designed by electrical professionals, lacking professionalism and scientificity

[0005] The traditional cold and heat source method of compression refrigeration + boiler has high power consumption and pollution, and the potential for energy saving is limited

Sewage water source heat pump technology is a comprehensive application of renewable energy technology, but the current application of sewage water source heat pump technology in China mainly has the following problems: the waste heat of urban sewage cannot be fully utilized according to local conditions, and the installed capacity of sewage source heat pumps is small, which needs to be further promoted; The water treatment is not up to standard, which reduces the service life and working performance of the equipment; the sewage source heat pump system lacks global optimization control, and is basically on manual duty, with chaotic operation and maintenance

The above problems lead to the decline of the overall performance of the sewage source heat pump system and affect the energy saving efficiency

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