A method for setting temperature of central air-conditioning chilled water supply based on fuzzy reasoning
A technology of water supply temperature and fuzzy reasoning, applied in the directions of space heating and ventilation, space heating and ventilation control input, heating method, etc., can solve problems such as different adjustment strategies and inability to achieve satisfaction
Active Publication Date: 2021-02-09
NR ELECTRIC CO LTD +1
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Problems solved by technology
Therefore, when adjusting the chilled water supply temperature, it is necessary to comprehensively consider economic benefits and comfort. In different time periods of the day, different loads, and different operating conditions, the adjustment strategies for chilled water supply temperature are different, and a simple formula is used to fit Unable to achieve satisfactory results
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[0062] The present invention will be further described below in conjunction with the accompanying drawings.
[0063] Such as figure 1 As shown, a central air-conditioning chilled water supply temperature setting method based on fuzzy reasoning, the specific steps are as follows:
[0064] Step 1: Collect the temperature and humidity of the outdoor environment, the temperature and flow of chilled water supply and return water, and calculate the enthalpy value of the outdoor air and the load of the air conditioner, and use it as the antecedent of fuzzy reasoning.
[0065] According to the calculation formula of air enthalpy:
[0066] H=1.01t+(2500+1.85t)d
[0067] Among them: H is the air enthalpy value, the unit is kJ / kg dry air, t is the air temperature, the unit is ℃, d is the moisture content of the air, the unit is kg / kg dry air.
[0068] The calculation formula of air humidity d is:
[0069]
[0070] Among them: P is the standard atmospheric pressure, which is 101325...
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The invention discloses a method for setting the temperature of central air-conditioning chilled water supply based on fuzzy reasoning, which includes collecting and calculating data from the outdoor environment and the central air-conditioning system to obtain the outdoor air enthalpy and air-conditioning load; selecting the calculation period and establishing each daily period The standard air enthalpy value, air-conditioning load and water supply temperature of the time period; the air enthalpy value and air-conditioning load are subjected to variable universe fuzzy processing; the deviation value of the water supply temperature in the current period is deduced by fuzzy table lookup and defuzzification, and the current period The set value of the chilled water supply temperature is obtained by summing the standard value and deviation value of the water supply temperature in the time period; by continuously adjusting the fuzzy domain of enthalpy and air-conditioning load and the fuzzy rule table, the chilled water supply temperature can meet the actual load demand, and Avoid energy waste of the air conditioning system due to low water supply temperature.
Description
technical field [0001] The invention relates to a method for setting the chilled water supply temperature of central air-conditioning based on fuzzy reasoning, and belongs to the technical field of energy-saving optimization control of central air-conditioning. Background technique [0002] At present, chilled water is usually used as the medium to exchange heat between the cold source and terminal equipment of large-scale central air-conditioning systems. In actual operation, the temperature of chilled water supply and return water is usually fixed at 7 / 12°C. However, the central air-conditioning system is usually designed according to the maximum load. In actual operation, it only operates under the design condition for a very short time, and operates under partial load most of the time. At this time, energy can be saved by adjusting the chilled water supply temperature. [0003] For conventional central air-conditioning systems without cold storage / ice storage, energy can...
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IPC IPC(8): F24F11/64F24F11/80F24F110/10F24F140/20F24F140/50
CPCF24F11/64F24F11/80F24F2110/10F24F2140/20F24F2140/50
Inventor 牛洪海陈霈管晓晨杨玉李兵耿欣
Owner NR ELECTRIC CO LTD