Conditions for the effective use of carbon dioxide as a working substance of heat pumps

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Abstract

The conditions of effective use of carbon dioxide! (R744) for heat pumps (HP) are considered on the basis of the analysis of its thermophysical and thermodynamic properties, and the competitiveness of HP on R744 with HP on freons. It is shown that the advantages of R744 are most pronounced in HP of large heat output. The works being carried out for the study of the processes, development of calculation techniques and designing of HP on R744 are reported.

About the authors

I. M. Kalnin

Moscow State University of Environmental Engineering

Author for correspondence.
Email: info@eco-vector.com

Dr. of Technical Sciences, Professor

Russian Federation, Moscow

V. A. Vasyutin

Moscow State University of Environmental Engineering

Email: info@eco-vector.com

Candidate of Technical Sciences

Russian Federation, Moscow

S. B. Pustovalov

Moscow State University of Environmental Engineering

Email: info@eco-vector.com
Russian Federation, Moscow

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2. Fig. 1. The heat pump on the R744

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3. Fig. 2. Field of optimum pressures p2opt for R744 TH (Δtw=40°С)

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4. Fig. 3. Values of electrical conversion coefficients of HP at R744 at optimum pressures p2

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5. Fig. 4. Dependence of the electrical conversion coefficient TH on the temperature difference Δtw at tw2=80°C and t0=5°C: I - R744; II - R142b

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6. Fig. 5. Basic processes in the heat pump: a - R744; 1-2 - compression of gaseous R744 in the compressor; 2-3 - cooling; 3-4 - expansion in the detander; 4-1' - boiling in the evaporator; 1'-1 - superheating in the evaporator; b - R1246; 1-2 - steam compression in the compressor; 2-2" - process in condenser; 2"-3 - supercooling; 3-4 - throttling; 4-1' - boiling in evaporator; 1'-1 - superheating in evaporator; I - heating of coolant; II - cooling of INT

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Copyright (c) 2003 Kalnin I.M., Vasyutin V.A., Pustovalov S.B.

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