A Control System for Improving the Comprehensive Energy Efficiency Ratio of Central Air Conditioning System

Abstract

The invention discloses a control system for improving the comprehensive energy efficiency ratio of a central air-conditioning system. Judgment subsystem, cooling water heat dissipation demand and load pre-judgment subsystem, chilled water pump and cooling water pump interactive variable flow control subsystem, and the above three subsystems are respectively electrically connected to the centralized controller, and the centralized controller is respectively connected to the refrigeration host, The refrigeration pump, cooling pump, cooling tower, electric regulating valve, and electric switching valve are electrically connected. The present invention takes the entire system as the control target, and comprehensively considers and controls the comprehensive energy efficiency ratio of water pumps, fans, refrigeration hosts and other equipment, and more Control the central air-conditioning system well, prolong the life of the system equipment, dig deep into the energy-saving space of the central air-conditioning system without affecting the comfort of use, and improve the overall energy efficiency ratio of the central air-conditioning system.

Description

technical field [0001] The invention relates to the field of central air-conditioning, in particular to a central air-conditioning energy-saving management system. Background technique [0002] Central air-conditioning is an essential part of modern intelligent buildings, but central air-conditioning is also a large energy-consuming household of modern buildings, and there is a trend of continuous improvement. In such a big environment, how to make the central air-conditioning system more energy-saving and efficient, and how to reasonably improve the overall energy efficiency ratio of the central air-conditioning system are more and more valued by current users. At each end of the air conditioner, although the design process uses methods such as hydraulic calculations and reasonable piping to achieve the hydraulic balance of the system as much as possible, the hydraulic imbalance of the system is still a common problem. Different air-conditioning areas often produce uneven c...

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Problems solved by technology

At each end of the air conditioner, although the design process uses methods such as hydraulic calculations and reasonable piping to achieve the hydraulic balance of the system as much as possible, the hydraulic imbalance of the system is still a common problem. Different air-conditioning areas often produce uneven cooling and heating, which affects the air conditioning. The energy-saving and stable operation of the system; moreover, most energy-saving manufacturers control the cooling tower extensively, so that the temperature of the cooling water is too high, resulting in an increase in the energy consumption of the refrigeration host; in the central air-conditioning system, the refrigeration system and the cooling system It is both an independent system and an interrelated system, but in other control systems, the two systems are separated and controlled independently. This control method, in a system with temperature as the main control parameter, due to temperature Hysteresis, so the control often lags behind the actual situation of the system, thus failing to meet the requirements of a reasonable control system. In a system that uses pressure as the main control, although the pressure has no time lag, the pressure cannot truly reflect the actual use of the end. need

For example, a central air-conditioning energy-saving management system whose patent number is CN201310659168 includes a workstation, a computer room system control cabinet and a terminal area control cabinet. The terminal area controller is connected to the computer room system control cabinet through the RS485 bus BACNET protocol, and the computer room system control cabinet is connected through the network. To the workstation, through the centralized control of the end of the air-conditioning area, real-time collection of on-site and air-conditioning internal data and timely feedback to the DDC controller, the DDC controller changes synchronously with the demand of the end load to achieve optimal management of the end, although it can be achieved to a certain extent Reduce the energy consumption of the air conditioner, achieve the effect of energy saving and emission reduction, and improve the service life of the equipment, but it is only a system management method. The energy saving measure is only a simple change of the start and stop of the main engine. The variable flow system is not used, and the energy saving method is simple and imprecise. , the energy saving effect is not obvious

[0003] In summary, the shortcomings of the existing technology are: now the central air-conditioning system is considered separately, and only pay attention to improving the power saving rate of individual equipment, rather than considering the energy saving and energy efficiency ratio of the entire system, which is often the power saving rate of individual equipment. Relatively high, while the power consumption of other equipment, especially the refrigeration main engine, remains high. This is the control misunderstanding and short board of most energy-saving enterprises. The existing air-conditioning system ignores the balance between supply and demand at the end, and does not adjust the cooling capacity according to actual needs. Pre-judgment and no fine control of the cooling tower group, resulting in the long-term operation of the central air conditioner under a relatively high load, resulting in a large amount of energy waste

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