Method for measuring and controlling assembled air-conditioner dew point

Abstract

A method for measuring and controlling dew point temperature of integrated air-conditioning includes obtaining dew point temperature measurement value corresponding to temperature and relative humidity measurement value of control object point as well as dew point temperature setting value corresponding to temperature and relative humidity setting value, comparing obtained dew point temperature measurement value with obtained setting value, using proportional integration and differential algorithm to control aperture of valve in separating range for making said measurement value be gradually tended to said setting value.

Description

technical field [0001] The invention relates to a method for measuring and controlling the dew point temperature of an air conditioner, in particular to a method for measuring and controlling the dew point temperature of a combined air conditioner based on calculated dew point, which is specially used in a constant temperature and humidity system. Background technique [0002] With the rapid development of contemporary science and technology, industrial constant temperature and humidity air conditioners have been widely used, and higher requirements have been put forward for the high precision measurement and control technology and energy saving control technology of constant temperature and humidity air conditioners. [0003] Generally, the physical parameters often involved in air conditioning include: dry bulb temperature (T), relative humidity (RH), wet air pressure (P), dew point temperature (TW), moisture content (D), and wet air enthalpy (H) etc. For the large-scale ...

AI Technical Summary

Problems solved by technology

However, in actual engineering applications, the relative humidity of the air cooled by the surface cooler often does not reach 95%, or exceeds 97%, and the air temperature behind the surface cooler of the air conditioning unit is inconsistent, which will cause the measured dew point temperature inaccurate value

Therefore, the dew point temperature value of the air behind the surface cooler measured by the ordinary temperature sensor has met the set value requirement of the dew point temperature on the surface, but the measured value of the actual air moisture content has been different from the set value of the moisture content. This often results in deviations in the supply air temperature or relative humidity of the supply air in subsequent control loops such as secondary heating or secondary return air, which affects control accuracy, reduces reliability, and wastes energy consumption

[0005] Dew point temperature measurement and power transmission are nothing more than two methods, namely ordinary temperature sensor measurement and professional dew point temperature sensor measurement. It is obviously unreasonable to use ordinary temperature sensors, and professional dew point temperature sensors are not only expensive Short (it is easy to cause damage to the humidity sensor when measuring close to the relative humidity at the dew point position of the machine), and this type of sensor often does not consider the coupling effect of other factors such as humid air pressure, and uses an approximate calculation of the power transmission output, so the measurement accuracy is low , and difficult to popularize

[0006] At present, there is no known dew point temperature measurement and control method for combined air conditioners based on dew point calculation for constant temperature and humidity systems.

Images