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Experimental performance of moderately high temperature heat pump with working fluid R1234ze(Z)

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Abstract

Low global warming potential working fluid R1234ze(Z) is anticipated to be the working fluid of the choice for the moderately high temperature heat pump in industrial applications. In this paper, the thermodynamic theoretical studies of the working fluids R114, R134a, R227ea, R236fa, R245fa and R1234ze(Z) were performed, and the theoretical analysis showed that the thermodynamic properties of R1234ze(Z) were better than other working fluids. The experimental investigations of the working fluids R134a, R227ea, R236fa, R245fa and R1234ze(Z) were carried out on a vapor compression heat pump system in the condensation temperature range of 70–85 °C with the cycle temperature lift (difference between condensation temperature and evaporation temperature) of 45 K. In addition, the experimental cycle performance of R1234ze(Z) with the cycle temperature lift of 58 K was also tested and compared with that with the cycle temperature lift of 45 K in the condensation temperature range of 70–85 °C. The coefficient of performance (COP) of R245fa was first measured to test the credibility of the newly developed apparatus. The test showed that the COP of R1234ze(Z) could reach up to 3.55 when the condensation temperature was 85 °C with the temperature lift of 45 K. The above assessments demonstrate that R1234ze(Z) is suitable for moderately high temperature heat pump applications.

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Abbreviations

COP:

Coefficient of performance

m :

Mass flow rate of working fluid (kg h−1)

P :

Pressure (MPa)

P c :

Critical pressure (MPa)

Pr :

Pressure ratio

Q :

Heat capacity (W)

t :

Temperature (°C)

T b :

Normal boiling temperature (K)

T c :

Critical temperature (K)

△T :

Temperature lift (K)

VHC:

Volumetric heating capacity (MJ m−3)

W :

Input power of compressor (W)

γ :

Latent heat (kJ kg−1)

ω :

Acentric factor

cond:

Condensation

disch:

Discharge

evap:

Evaporation

CFCs:

Chlorofluorocarbons

GWP:

Global warming potential

HCs:

Hydrocarbons

HCFCs:

Hydrochlorofluorocarbons

HFCs:

Hydrofluorocarbons

HFOs:

Hydrofluoroolefins

HTHP:

High temperature heat pump

MHTHP:

Moderately high temperature heat pump

ODP:

Ozone depletion potential

ORC:

Organic Rankine cycle

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Acknowledgements

This work was financially supported by the Fundamental Research Funds for the Central Universities of China (Project No. 2017MS089).

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Authors and Affiliations

  1. Department of Power Engineering, North China Electric Power University, Baoding, 071003, China

    Xuedong Zhang

  2. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Xuedong Zhang

  3. Department of Electrical Engineering, North China Electric Power University, Baoding, 071003, China

    Huimin Xu

  4. Department of Basic Course, Hebei Finance University, Baoding, 071051, China

    Huimin Xu

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  1. Xuedong Zhang
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Correspondence to Xuedong Zhang.

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Zhang, X., Xu, H. Experimental performance of moderately high temperature heat pump with working fluid R1234ze(Z). J Therm Anal Calorim 144, 1535–1545 (2021). https://doi.org/10.1007/s10973-020-09610-1

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