Publication detail

Evaporation of refrigerant R134a, R404A and R407C with low mass flux in smooth vertical tube

HORÁK, P. FORMÁNEK, M. FEČER, T. PLÁŠEK, J.

Original Title

Evaporation of refrigerant R134a, R404A and R407C with low mass flux in smooth vertical tube

Type

journal article in Web of Science

Language

English

Original Abstract

This experimental study analysis the low mass flux of refrigerant R134a, R404A, and R407C in the smooth vertical evaporator tube with an inner diameter of 32 mm. This downward-flow refrigerant with a mass flux of about 9 kg m −2 s −1 in the parallel/counter flow of heating water shows suppressed heat trans- fer by convective boiling and dominant heat transfer by nucleate boiling. This dominant heat transfer by nucleate boiling is dependent on the superheated wall of evaporator tube. The experimentally obtained Nusselt number correlates 92.2 % for R134a, 92.4 % for R404A, and 83.2 % for R407C with the predicted Nusselt number for mass flux over 10 kg m −2 s −1 . In summary, the untypically low mass flux of refrig- erant about 9 kg m −2 s −1 is comparable with the current state of knowledge for low mass flux over 10 kg m −2 s −1 .

Keywords

Mass flux Heat flux Vapour quality Heat transfer coefficient Nusselt number

Authors

HORÁK, P.; FORMÁNEK, M.; FEČER, T.; PLÁŠEK, J.

Released

21. 9. 2021

Publisher

Elsevier

Location

United Kingdom

ISBN

0017-9310

Periodical

International journal of heat and mass transfer

Year of study

181

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

https://www.sciencedirect.com/science/article/pii/S0017931021009509

BibTex

@article{BUT172543,
  author="Petr {Horák} and Marian {Formánek} and Tomáš {Fečer} and Josef {Plášek}",
  title="Evaporation of refrigerant R134a, R404A and R407C with low mass flux in smooth vertical tube",
  journal="International journal of heat and mass transfer",
  year="2021",
  volume="181",
  number="1",
  pages="1--8",
  doi="10.1016/j.ijheatmasstransfer.2021.121845",
  issn="0017-9310",
  url="https://www.sciencedirect.com/science/article/pii/S0017931021009509"
}