An implicit curve-fitting method for fast calculation of thermal properties of pure and mixed refrigerants |
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Authors: | Guoliang Ding Zhigang Wu Jian Liu Takefumi Inagaki Kaijian Wang Masaharu Fukaya |
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Affiliation: | aInstitute of Refrigeration and Cryogenics, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai 200030, China;bFujitsu General Institute of Air-Conditioning Technology Limited, 1116 Suenaga, Takatsu-Ku, Kawasaki 213-8502, Japan |
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Abstract: | Calculations of refrigerant thermal properties are desired to be very fast and stable in cases of simulation of refrigeration system, etc. The traditional method based on equation of state cannot meet such requirement because of unavoidable iterations in calculation. In this paper, a new calculation method for refrigerant thermal properties is presented. Low order implicit polynomial equations are got by using curve-fitting method at first, and then explicit formulae for calculating refrigerant thermal properties quickly are obtained by getting the analytical solution of these implicit equations. Explicit fast calculation formulae for thermal properties of R22 and R407C, covering the saturated temperature of −6080 °C and superheat of 0–65 °C, are presented as examples. The calculation speeds of the formulae of R22 are about 140 times faster than those of REFPROP 6.01 while the formulae of R407C are about 1000 times faster. The total mean relative deviations of the fast calculation formulae for R22 and R407C are less than 0.02%. |
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Keywords: | Refrigerants Mixture Calculation Thermal propertiesMots clé s: Frigorigè nes Mé lange Calcul Proprié té s thermiques |
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