Formulations of thermodynamic properties of supersaturated moist air

Abstract

Supersaturated air exits whenever the amount of moisture present is larger than the amount that the air can carry at the prevailing air temperature. Applications involving supersaturated air include aircraft wing icing problems and industrial walk-in freezers operating at low temperatures. The ability to predict frost and ice formation patterns on cold surfaces in supersaturated air has historically been impeded by the lack of property data. The objective of this paper is thus to provide a methodology for deriving key properties of air under supersaturated conditions for the purpose of improving the prediction capability in situations involving simultaneous heat and mass transfer in supersaturated air.

Keywords

psychrometrics moist air thermodynamics air properties supersaturated air

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References

Sherif

S. A.

Mago

P. J.

Theen

R. S.

A study to determine heat loads due to coil defrosting—Phase II. Final Technical Report UFME/SEECL-200201, Contract ASHRAE-1094-RP, The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, Georgia, February 2002 (revised May 2002).

Mago

P. J.

Sherif

S. A.

Dynamics of coil defrosting in supersaturated freezer air. J. Proc. Instn Mech. Engrs, Part C: J. Mechanical Engineering Science, 2002, 216(C10), 949–958.

Hyland

R. W.

Wexler

Formulation of the thermodynamic properties of dry air from 173.15K to 473.15K, and of saturated moist air from 173.15K to 372.15K, at pressures to 5MPa. ASHRAE Trans., 1983, 89(2A), 520–535.

Hyland

R. W.

Wexler

Formulation for the thermodynamic properties of the saturated phases of H₂O from 173.15K to 473.15K. ASHRAE Trans., 1983, 89(2A), 500–519.

Sauer

H. J.

Nelson

H. F.

Huang

The search for high temperature experimental psychrometric data. ASHRAE Trans., 2001, 107(2), 768–779.

Nelson

H. F.

Sauer

H. J.

Huang

High temperature properties of moist air. ASHRAE Trans., June 2001, 107(2), 780–791.

Sherif

S. A.

Overview of psychrometrics. ASHRAE J., July 2002, 44(7), 33–42.

Stewart

R. B.

Jacobsen

R. T.

Becker

J. H.

Formulations for thermodynamic properties of moist air at low pressures as used for construction of new ASHRAE SI Unit Psychrometric Charts. ASHRAE Trans., 1983, 89(2A), 536–548.

Olivieri

Singh

Lovodocky

Psychrometrics: Theory and Practice, 1996 (The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, Georgia).

10.

2001 ASHRAE Handbook—Fundamentals, 2001 (The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, Georgia).

11.

Himmelblau

D. M.

Solubilities of inert gases in water. J. Chem. Engng Data, 1960, 5(1), 10–15.