Details
| Original language | English |
|---|---|
| Pages (from-to) | 6235-6242 |
| Number of pages | 8 |
| Journal | International Journal of Heat and Mass Transfer |
| Volume | 51 |
| Issue number | 25-26 |
| Early online date | 14 Jul 2008 |
| Publication status | Published - Dec 2008 |
| Externally published | Yes |
Abstract
This paper presents experimental results on evaporation heat transfer for flow boiling of ammonia and of R134a in a chevron-pattern corrugated plate heat exchanger (PHE). The measurements enable the evaluation of a quasi-local heat transfer coefficient along the plate, which in turn allows discussing the two-phase distribution and the heat transfer mechanism during evaporation in a plate channel. The saturation temperature varied between 268 K < TNH 3s < 283 K (3.55 bar < pRs < 5.73 bar) for ammonia and 265 K < TR 134 as < 283 K (2.157 bar < pRs < 4.14 bar) for R134a. The heat transfer coefficient is discussed in relation to the vapor quality, mass flux, heat flux and the type of refrigerant. The secondary fluid is a water/ethylene glycol mixture flowing in counter flow or parallel flow arrangement within the PHE. It is shown that the parallel flow case yields better overall performance than the counterflow case, and that plates with low chevron angle corrugations increase the evaporation heat transfer. Comparison with the limited data available from the literature shows good agreement. The Danilova equation and the Steiner boiling correlation are adapted to PHEs and show the need for further theoretical development.
Keywords
- Ammonia, Evaporation, Heat transfer coefficient, Plate heat exchanger, R134a
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanical Engineering
- Chemical Engineering(all)
- Fluid Flow and Transfer Processes
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In: International Journal of Heat and Mass Transfer, Vol. 51, No. 25-26, 12.2008, p. 6235-6242.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Flow boiling of R134a and ammonia in a plate heat exchanger
AU - Djordjevic, E.
AU - Kabelac, S.
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/12
Y1 - 2008/12
N2 - This paper presents experimental results on evaporation heat transfer for flow boiling of ammonia and of R134a in a chevron-pattern corrugated plate heat exchanger (PHE). The measurements enable the evaluation of a quasi-local heat transfer coefficient along the plate, which in turn allows discussing the two-phase distribution and the heat transfer mechanism during evaporation in a plate channel. The saturation temperature varied between 268 K < TNH 3s < 283 K (3.55 bar < pRs < 5.73 bar) for ammonia and 265 K < TR 134 as < 283 K (2.157 bar < pRs < 4.14 bar) for R134a. The heat transfer coefficient is discussed in relation to the vapor quality, mass flux, heat flux and the type of refrigerant. The secondary fluid is a water/ethylene glycol mixture flowing in counter flow or parallel flow arrangement within the PHE. It is shown that the parallel flow case yields better overall performance than the counterflow case, and that plates with low chevron angle corrugations increase the evaporation heat transfer. Comparison with the limited data available from the literature shows good agreement. The Danilova equation and the Steiner boiling correlation are adapted to PHEs and show the need for further theoretical development.
AB - This paper presents experimental results on evaporation heat transfer for flow boiling of ammonia and of R134a in a chevron-pattern corrugated plate heat exchanger (PHE). The measurements enable the evaluation of a quasi-local heat transfer coefficient along the plate, which in turn allows discussing the two-phase distribution and the heat transfer mechanism during evaporation in a plate channel. The saturation temperature varied between 268 K < TNH 3s < 283 K (3.55 bar < pRs < 5.73 bar) for ammonia and 265 K < TR 134 as < 283 K (2.157 bar < pRs < 4.14 bar) for R134a. The heat transfer coefficient is discussed in relation to the vapor quality, mass flux, heat flux and the type of refrigerant. The secondary fluid is a water/ethylene glycol mixture flowing in counter flow or parallel flow arrangement within the PHE. It is shown that the parallel flow case yields better overall performance than the counterflow case, and that plates with low chevron angle corrugations increase the evaporation heat transfer. Comparison with the limited data available from the literature shows good agreement. The Danilova equation and the Steiner boiling correlation are adapted to PHEs and show the need for further theoretical development.
KW - Ammonia
KW - Evaporation
KW - Heat transfer coefficient
KW - Plate heat exchanger
KW - R134a
UR - http://www.scopus.com/inward/record.url?scp=55649111358&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2008.01.042
DO - 10.1016/j.ijheatmasstransfer.2008.01.042
M3 - Article
AN - SCOPUS:55649111358
VL - 51
SP - 6235
EP - 6242
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
IS - 25-26
ER -