eISSN:2278-5299

International Journal of Latest Research in Science and Technology

DOI:10.29111/ijlrst   ISRA Impact Factor:3.35,  Peer-reviewed, Open-access Journal

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AN ACCURATE AND COMPUTATIONALLY EFFICIENT APPROXIMATION TO PSYCHROMETRIC CALCULATIONS

Research Paper Open Access

International Journal of Latest Research in Science and Technology Vol.3 Issue 3, pp 15-24,Year 2014

AN ACCURATE AND COMPUTATIONALLY EFFICIENT APPROXIMATION TO PSYCHROMETRIC CALCULATIONS

Emmanuel D. Rogdakis, Dimitrios Nik. Tertipis

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Received : 22 May 2014; Accepted : 31 May 2014 ; Published : 30 June 2014

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Abstract

The present paper deals with a computationally efficient procedure to calculate the psychrometric properties of moist air. Taking into account the simplified approximations by ASHRAE and the accurate correlations for the dry air (Lemmon et al., 1999) and saturated steam (Wagner & Kretzschmar, 2008) properties, a simple model is built to predict the thermodynamic behaviour of any moist air working system. All properties are calculated using polynomial correlations of higher grade or of lower grade, according to their accuracy: thus, the computational efficiency is achieved, while the values of each property is satisfactorily accurate (average errors are lower than 0.05%). Apart from improved correlations for extensive properties (volume, enthalpy and entropy) and intensive properties (partial pressure, dew point temperature) of moist air, a new approximation is presented to calculate the wet-bulb temperature without solving any iteration based complex equation. The results of the presented method are compared to the ASHRAE approximation and the accurate correlations by Lemmon and Kretzschmar, in terms of error, average error and standard deviation of error in a range of dry – bulb temperature between 0οC and 80oC.

Key Words   
Psychrometrics, Dry air properties, Saturated air properties, Specific enthalpy, Specific entropy, W
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References
  1. ASHRAE (2009): Psychrometrics. Fundamentals, pp. 1.1 – 1.16
  2. Wexler A., Hyland R., Stewart R. (1983): Thermodynamic Properties of Dry Air, Moist Air and Water and Psychrometric Charts. ASHRAE
  3. Preston-Thomas H. (1989): The international temperature scale of 1990 (ITS-90). Metrologia, 27, pp. 3 – 10
  4. Lemmon E., Jacobsen R., Penoncello S., Friend D. (1999): Thermodynamic properties of Air and mixtures of Nitrogen, Argon and Oxygen from 60 to 2000K at pressures to 2000MPa. Journal of Physical and Chemical Reference Data, 29(3), pp. 331 – 385.
  5. Wagner W., Kretschmar H.J. (2008): International Steam Tables. Springer, ISBN 978-3-540-21419-9
  6. Poling B., Thomson G., Friend D., Rowley R., Wilding W. (2008): Physical and Chemical Data. Perry’s Chemical Engineers’ Handbook.
  7. Rogdakis E., Koronaki I., Tertipis D. (2014): Experimental and computational evaluation of a Maisotsenko evaporative cooler at Greek climate. Energy and Building, 70, pp. 497 – 506
To cite this article

Emmanuel D. Rogdakis, Dimitrios Nik. Tertipis , " An Accurate And Computationally Efficient Approximation To Psychrometric Calculations ", International Journal of Latest Research in Science and Technology . Vol. 3, Issue 3, pp 15-24 , 2014


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