A method and device for measuring cooling and heat at the end of a fan coil unit in a central air-conditioning system

Abstract

The invention relates to a method and device for metering cooling capacity and heating capacity of a fan coil, which is based on a correction relation between the cooling capacity and the heating capacity of the fan coil under actual working conditions and the cooling capacity and the heating capacity of the fan coil under normal working conditions. while metering, the cooling capacity of the fancoil under the actual working conditions can be obtained just by detecting the wind speed state, the inlet water temperature and the inlet air temperature and humidity of the fan coil, that is to say, the accurate measurement of the cooling capacity and the heating capacity can be indirectly realized by the direct detection of easily-measured data. The method and the device disclosed by the invention combines the advantages of dual temperatures in water side, heat exchange in wind side and time metering and avoids the measurement of water flow, thereby greatly reducing the cost of a metering device, improving the data stability and prolonging the service life of the device. According to the invention, the air state measurement is carried out by replacing air outlet section with an air inlet section, so that the parameter measurement is simpler and more convenient and easy to measure, and the engineering application maneuverability of metering is improved; meanwhile, the influence of parameters at the water side and the wind side of the fan coil on the cooling capacity and the heating capacity of the fan coil are considered and included, so that the metering accuracy is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of energy metering and billing, and in particular relates to a cooling and heat metering technology at the end of a fan coil unit of a centralized air-conditioning system. Background technique [0002] Accurate measurement and reasonable billing of cold and heat in air-conditioning systems are not only beneficial to building energy conservation, but also beneficial to property management. Fan coil unit is the most common terminal form of central air conditioning system. At present, the cooling capacity measurement methods for fan coil air conditioning systems mainly include: timing method, water side dual temperature flow measurement method and wind side heat transfer measurement method. [0003] The timing method is to accumulate the running time of the fan coil unit. It only considers the fan power at different wind speeds, and does not consider the changes in the chilled water flow rate and chilled water...

AI Technical Summary

Problems solved by technology

Although the high investment of water measurement is avoided, finding a measuring point position that can represent the average state of the air needs to be determined through experiments, which is not conducive to engineering applications

Images