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

Abstract

The invention provides an energy-saving control method and system for an air-source heat pump system. The method comprises the following steps that S1, a building standard cooling and heating load prediction model is constructed; S2, building refinement partitioning is conducted according to the building standard cooling and heating load prediction model, a cooling and heating energy-using demanddynamic curve of all subzones of a building is generated, and the dynamic curve is updated once at intervals; and S3, an air-source heat pump unit and an indoor tail end thereof, a freezing water pump, a valve unit, a fan and a heat pump host respond to an instruction sent by a central host in time, and according to the energy-using demand dynamic curve and combination of a time delay caused by the adjustable segment length and fluid velocity, operation stages of the air-source heat pump system is divided into an equipment starting stage, a steady state operation stage and an equipment shutdown stage for staging control. The invention further comprises the energy-saving control system of the air-source heat pump system. The energy-saving control system has the advantages of being efficient, stable, free of pollution, low in energy consumption, significant in energy-saving effect and the like, and therefore the total energy efficiency of the system can be improved by 5% to 25% on the basis of the original system efficiency.

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 an air 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, c...

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

Air source heat pump technology is a comprehensive application of renewable energy technology, but the current application of air source heat pump technology in China mainly has the following problems: the low temperature air heat source cannot be fully utilized according to local conditions, and the installed capacity of heat pump is small, which needs to be further promoted; The system generally lacks global optimization control, and is basically in a manual on-duty state, with chaotic operation and maintenance

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

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