Energy-saving control method and system for river water source heat pump system

Abstract

Provided are an energy-saving control method and system for a river water source heat pump system. The method comprises the following steps that S1, building standard cold and heat energy consumptionlarge data are built; S2, according to the building function, energy using time and load distribution difference, by combination with the building standard cold and heat energy consumption large data,building refinement partitioning is conducted, a cold and heat energy requirement dynamic curve of all subzones of a building is generated, and the dynamic curve is updated once at fixed intervals; and S3, according to the cold and heat energy requirement dynamic curve of the building, the large hysteresis quality and nonlinearity of an air conditioner system are considered, the river water source heat pump system is divided into an equipment starting stage, a steady-state operation stage and an equipment halt stage, and staged control is conducted; and the temperature changes of river waterare monitored in real time, and when the temperature difference of inlet and outlet water of a river water source heat pump unit exceeds the set value, corresponding water pumps are controlled in a variable-frequency mode, and the water flow is adjusted. The invention further discloses the energy-saving control system for the river water source heat pump system. The energy-saving control method and system for the river water source heat pump system have the advantages of being high in efficiency, stable, free of pollution, small in energy consumption, remarkable in energy-saving effect and thelike.

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 river water 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 ...

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] In addition, 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

Ground water source heat pump technology is a comprehensive application of renewable energy technologies. However, the current application of ground water source heat pump technology in China mainly has the following problems: preliminary design is rough, unit selection is too large, water treatment is not up to standard; construction does not meet design requirements; In the operation stage, there is a lack of effective supervision of the heat pump system, and the operation management is relatively chaotic, resulting in energy waste

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

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