Study of the heat pump for a passenger electric vehicle based on refrigerant R744

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00359149" target="_blank" >RIV/68407700:21220/22:00359149 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.24425/ather.2022.141976" target="_blank" >https://doi.org/10.24425/ather.2022.141976</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.24425/ather.2022.141976" target="_blank" >10.24425/ather.2022.141976</a>

Result language

angličtina

Original language name

Study of the heat pump for a passenger electric vehicle based on refrigerant R744

Original language description

Abstract Energy management plays a crucial role in cabin comfort as well as enormously affects the driving range. In this paper energy balances contemplating the implementation of a heat pump and an expansion device in battery electric vehicles are elaborated, by comparing the performances of refrigerants R1234yf and R744, from –20°C to 20°C. This work calculates the coefficient of performance, energy requirements for ventilation (from 1 to 5 people in the cabin) and energy required with the implementation of a heat pump, with the employment of a code in Python with the aid of CoolProp library. The work ratio is also estimated if the work recovery device recuperates the work during the expansion. Comments on the feasibility of the implementation are as well explicated. The results of the analysis show that the implementation of an expansion device in an heat pump may cover the energy requirement of the compressor from 27% to more than 35% at 20°C in cycles operating with R744, and from 15% to more than 20% with refrigerant R1234yf, considering different compressor efficiencies. At –20°C, it would be possible to recuperate between around 30 and 24%. However, the risk of suction when operating with R1234yf at ambient temperatures below –10°C shows that the heat pump can only operate with R744. Thus, it is the only refrigerant that achieves the reduction of energy consumption at these temperatures.

Czech name

—

Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

—

OECD FORD branch

20303 - Thermodynamics

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Archives of Thermodynamics

ISSN

1231-0956

e-ISSN

2083-6023

Volume of the periodical

43

Issue of the periodical within the volume

2

Country of publishing house

PL - POLAND

Number of pages

20

Pages from-to

17-36

UT code for WoS article

000843340700002

EID of the result in the Scopus database

2-s2.0-85135896973