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

Abstract

Provided are an energy-saving control method and system for a deep lake water source heat pump system. The method comprises the following steps that S1, a building cold and heat load prediction modelis built; S2, building refinement partitioning is conducted according to the building cold and heat load prediction model, and a cold and heat energy requirement dynamic curve of all subzones of a building is generated and is updated once every other 15-30 min; and S3, an indoor terminal, a freezing water pump, a valve unit, a deep lake water source side water pump and a heat pump host of the deeplake water source heat pump system respond to a command sent by a central host in time, the equipment response time, the starting and stopping characteristics and the system water capacity are considered according to the energy requirement dynamic curve, the deep lake 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. The invention further discloses the energy-saving control system for the deep lake water source heat pump system. The energy-saving control method and system forthe deep lake 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 the like.

Description

Technical field [0001] The invention relates to the field of air-conditioning energy-saving control, in particular to an energy-saving control method and system for a deep lake water source heat pump system based on big data, three-stage and fine zoning control. Background technique [0002] Air-conditioning and heating equipment are the largest consumers of 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 potential of building energy saving is huge. [0003] At present, the design of the central air-conditioning system in the Chinese building market is very rough, and there is serious energy waste. The specific manifestations are as follows: ① The blind use of new energy technologies and the lack of attention to the matching between the energy supply system and the energy-using system result in a relatively good operation effect of the entire air-conditioning...

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

Deep lake water source heat pump technology is a comprehensive application of renewable energy technologies, but the current application of deep lake water source heat pump technology in China mainly has the following problems: it cannot be flexibly used according to local conditions, the total installed capacity is small, and needs to be further promoted; water treatment is not enough Up to the standard, seriously affecting the service life and performance of the unit; lack of global control system, full manual operation, lack of effective supervision, chaotic operation and maintenance

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

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