<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The results of the numerical calculation of the thermodynamic parameters of a cascade (two-stage) air-to-water heat pump at low atmospheric air temperatures are presented. A Freon R407c is used in the first circuit and a R152a is used in the second circuit. Calculations are made for ambient temperatures from 7°С to –25°С. The effect of underrecovery temperatures in heat exchange equipment is shown. Cycles with R245fa, R142b, R114, R123, R290, R236fa, R600a refrigerants, a mixture of isobutane and isopentane have been investigated. The effect of the complexity of a two-stage scheme on the efficiency of the cycle has been evaluated. The use of more complex schemes (for example, with liquid injection) does not affect the thermodynamic perfection of the heat pump and may be appropriate only to ensure operational reliability. Reducing the underrecovery temperature to 1 K is shown to increase the thermodynamic efficiency of the installation.</p>
</abstract>

The results of the numerical calculation of the thermodynamic parameters of a cascade (two-stage) air-to-water heat pump at low atmospheric air temperatures are presented. A Freon R407c is used in the first circuit and a R152a is used in the second circuit. Calculations are made for ambient temperatures from 7°С to –25°С. The effect of underrecovery temperatures in heat exchange equipment is shown. Cycles with R245fa, R142b, R114, R123, R290, R236fa, R600a refrigerants, a mixture of isobutane and isopentane have been investigated. The effect of the complexity of a two-stage scheme on the efficiency of the cycle has been evaluated. The use of more complex schemes (for example, with liquid injection) does not affect the thermodynamic perfection of the heat pump and may be appropriate only to ensure operational reliability. Reducing the underrecovery temperature to 1 K is shown to increase the thermodynamic efficiency of the installation.

Parameters of a cascade two-stage air-to-water heat pump at low ambient temperature

O.M. Beketov National University of Urban Economy in Kharkiv

Ukrainian State University of Railway Transport

Construction of Optimized Energy Potential

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The results of the numerical calculation of the thermodynamic parameters of a cascade (two-stage) air-to-water heat pump at low atmospheric air temperatures...

Parameters of a cascade two-stage air-to-water heat pump at low ambient temperature

Pubblicato online: 02 dic 2023

Pagine: 132 - 142

DOI: https://doi.org/10.17512/bozpe.2023.12.15

Parole chiave
heat pump, low air temperature, refrigerant, thermodynamic parameters

© 2023 Аndriy Redko et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Parameters of a cascade two-stage air-to-water heat pump at low ambient temperature

Pubblicato online: 02 dic 2023

Pagine: 132 - 142

DOI: https://doi.org/10.17512/bozpe.2023.12.15

Parole chiaveheat pump, low air temperature, refrigerant, thermodynamic parameters

© 2023 Аndriy Redko et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Parole chiave
heat pump, low air temperature, refrigerant, thermodynamic parameters