On-line monitoring method and device for energy efficiency of central air conditioning system

Abstract

The invention provides an on-line monitoring method and device for the energy efficiency of a central air conditioning system. The on-line monitoring method for the energy efficiency of the central air conditioning system comprises the steps that according to electric data of the central air conditioning system, the energy consumption condition of the central air conditioning system is acquired based on an energy consumption model of the central air conditioning system; and the energy efficiency condition of the central air conditioning system is calculated based on the energy consumption condition of the central air conditioning system. According to the on-line monitoring method and device, by means of data processing of the historical operation parameters of the central air conditioning system, simulation modeling is carried out on the energy consumption of the central air conditioning system, then the correlation between the electric data acquired by an intelligent electricity meter and the central air conditioning system is analyzed, the real-time energy consumption of the central air conditioning system and all parts can be obtained by obtaining the electric data in real time, and then the energy efficiency conditions of the central air conditioning system and all the parts can be analyzed; and the problem that required parameters for existing on-line recognition of the energy efficiency of the central air conditioning system are complex can be solved.

Description

technical field [0001] The invention relates to the fields of electrical engineering and heating, ventilating and air-conditioning, and more specifically, to an online monitoring method and device for energy efficiency of a central air-conditioning system. Background technique [0002] With the development of society, the higher people's living standard is, the more energy they consume. Construction is a high-energy-consuming industry, which now accounts for 28% of the total energy consumption of society. In building energy consumption, the power consumption of air conditioners in summer accounts for 30% to 40% of the summer peak load in medium and large cities, and even 50% to 60% in large cities and megacities. The electricity consumption of air conditioners adds a great burden to the power supply. [0003] Central air-conditioning is a complex large system consisting of multiple subsystems, and each subsystem includes multiple devices and related components. About 90% ...

AI Technical Summary

Problems solved by technology

About 90% of the time of the central air conditioner in public buildings is operating in the range of load rate below 70%, of which 65% of the time is operating under the condition of load rate below 50%, and only about 1% of the time in the whole year is at full capacity. The data on the nameplate cannot reflect the real operating energy efficiency level of the central air conditioner

[0004] Existing research on the energy efficiency of central air-conditioning systems mainly focuses on the interior of the central air-conditioning system, and the monitoring methods are relatively cumbersome, requiring too many measurement points and measurement parameters, including structural thermal performance of buildings, outdoor temperature, personnel density, and lighting indicators , as well as many parameters in the central air conditioner, etc., and the measurement parameters usually cannot be measured at the same time

Therefore, its data requirements are relatively strict, and it is not easy to achieve in practical applications.

Images