Cold and heat metering isenthalpic difference calibration weighting method for central air-conditioning fan coil

Abstract

The invention relates to a cold and heat metering isenthalpic difference calibration weighting method for a central air-conditioning fan coil, comprising the following steps of: calibrating the weighted values of the fan coil at various air speeds on site; determining the thermal equivalents of the fan coil at various air speeds according to the weighted values; determining the heating cost of the fan coil according to the thermal equivalents at various air speeds, wherein the calibration of the weighted values comprises the following steps of: inputting the total heat corresponding to the high air speed, the medium air speed and the low air speed through looking up a product specification of the fan coil into a metering temperature controller; imbedding the weighted value of the fan coil under the fan stop status into the metering temperature controller; embedding the time of starting the calibration and the time of stopping the calibration into the metering temperature controller; controlling temperature by the metering temperature controller through automatically regulating the air speed of the coil fan; and after the calibration is ended, automatically generating the weighted values of the fan coil corresponding to the high air speed, the medium air speed and the high air speed through the metering temperature controller. The invention makes the fan coil metering simple and easy to implement, can realize the same comfort level and the same cost and can restrain the waste phenomenon of windowing and the like.

Description

technical field [0001] The invention relates to a cooling and heat metering and billing method of a central air-conditioning fan coil system, in particular to a method for calibrating and weighting the enthalpy difference of the central air-conditioning fan coil cooling and heat measurement. Background technique [0002] At present, the popular metering and billing method for central air-conditioning fan coil units in China is a time-based scheme. Specifically, the time-based scheme uses the running time of the fan coil units at high, medium and low wind speeds and their corresponding cooling (heat) quantities to calculate the total billing time. Consumes cold (heat) amount. Its basic formula is: [0003] Q W =Q H ×T H +Q M ×T M +Q L ×T L [0004] Among them: Q W It is the total cooling (heat) consumption of the fan coil unit, unit Kw.h (kilowatt hour); Q H , Q M , Q L Respectively, the cooling (heating) power of the fan coil unit in the high, medium and low gea...

AI Technical Summary

Problems solved by technology

In order to solve the problem of the same comfort and the same cost, the applicant proposed a weighted billing method based on temperature and air volume in the Chinese patent "Fan Coil Metering Control Device and Heat Metering Method" (Patent No. ZL 200510046815.4) to solve The problem of linking temperature and energy consumption can be solved, and waste can be effectively suppressed

However, this method also has some disadvantages

First of all, the calibration method is not simple enough. This method stipulates that the calculation work is carried out under the following design conditions: the outdoor temperature is close to the seasonal average temperature; the outlet water temperature of the refrigerator is 7°C in summer, and the indoor temperature is set at 23-26°C; During calibration, the boiler outlet water temperature is 50-55°C, and the indoor temperature is 18-20°C

The setting of these conditions is mainly considered to be consistent with the measurement conditions of the factory parameters of the fan coil unit, but it increases the difficulty of calibration, making it very difficult to implement calibration; secondly, the energy consumption of the fan coil unit is proportional to the difference between indoor and outdoor enthalpy, while using Room temperature as the basis for billing is not as accurate as billing based on indoor and outdoor enthalpy difference

Especially in summer, if 45 minus the indoor temperature is used as the billing basis and the humidity factor is not considered, the error of cooling measurement in summer will increase.

The third is that this method does not consider enough the influence of heat transfer between households, and at the same time, the expression of the principle and derivation process is not rigorous enough, so it is necessary to improve the above deficiencies

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