Ideas and measures to improve energy station energy efficiency and system energy efficiency-Part 1

According to statistics, the energy consumption of HVAC systems in public buildings accounts for 30% to 50% of the total energy consumption. The energy consumption of the energy station accounts for about 50% of the HVAC system, and there is a large space for energy saving, which is a hot spot in the industry at present. This paper analyzes the main factors affecting the energy consumption of energy stations, and takes a large-scale energy station as an example to explore the ideas and measures to improve the energy efficiency of energy stations and system energy efficiency based on the principle of overall energy saving of the whole system.

Influencing Factors of Energy Station Energy Consumption

The energy station provides cold water and hot water for the air-conditioning system. It is the core of the air-conditioning system and the main energy-consuming part of the entire air-conditioning system. As far as conventional projects are concerned, the equipment in the energy station mainly includes chillers, water pumps, cooling towers, water treatment equipment, etc. The energy consumption of energy stations mainly includes energy consumption of cold and heat sources, energy consumption of cold and hot water transmission and distribution of air conditioners, and energy consumption of cooling water systems. The factors that affect the energy consumption of the computer room mainly include four aspects: system architecture, accuracy of the whole process, control strategy, adjustment and operation and maintenance level, which are briefly described below.

1.1 System Architecture

System architecture refers to the system form and its key design parameters. As the primary factor determining the energy consumption level of an energy station, the "high efficiency" of an energy station requires a reasonable system architecture as a support.

1.2 The accuracy of the whole process

The accuracy of the system involves the entire life cycle of energy station construction and operation. The realization of precision needs to run through all links such as design, construction, control and operation and maintenance. In the design stage, factors such as the type and positioning of the building, changes in future formats, and utilization rates should be considered comprehensively. Clarify the load characteristics, accurately grasp the changing law of load demand throughout the year, and the system capacity and unit matching can meet the normal and efficient operation of different load segments. Accurately match equipment and pipe network specifications with building requirements.

During the construction stage, equipment and valve parts should be purchased correctly according to the requirements, installed correctly in strict accordance with the standards, and tested and debugged. In terms of control, it is necessary to accurately grasp the external requirements and external conditions of building objects, and on the premise of accurately understanding the inherent technical characteristics and capabilities of the air-conditioning system, establish a collaborative control and precise matching control strategy. In the operation and maintenance phase, we should fully understand the system concept, correctly implement the control strategy, continue to optimize the operation, realize on-demand supply, and reduce the energy consumption of operation while ensuring a comfortable environment.

1.3 Control strategy

The role of the control system is to make each device in the system run normally and output power on demand, so as to achieve the goal of ensuring the indoor thermal environment and reducing unnecessary energy consumption. The key technical points of building the system should be fully understood, and a control strategy matching the system architecture should be formulated. According to the current research and feedback, a considerable number of engineering automatic control systems cannot operate normally.

1.4 Adjustment and operation and maintenance level

A number of engineering investigations have shown that the level of system adjustment and operation and maintenance is one of the main factors that determine the actual energy consumption in operation. Adaptation can improve the system in a targeted manner, connect construction and operation, and provide a "healthy" system for operation. Operation and maintenance should be based on the understanding of the system, and should be continuously optimized and adjusted according to the actual situation. Systems that run inefficiently are often over-provisioned or under-provisioned, equipment in poor working condition, etc., resulting in high energy consumption and low service levels.

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