Abstract
The working fluids of loop heat pipes (LHPs) play an important role in the operation of the LHPs by influencing the operating temperatures and the heat transfer limits. Therefore, the proper selection of a working fluid is a key practice in LHP fabrication, and there has been a high demand for an appropriate index that enables the quantitative comparison of the steady-state thermal performance of the working fluids. In this work, a figure of merit for LHPs was theoretically derived and experimentally verified. In particular, the pressure losses in the LHP operation were balanced with the saturation pressure difference between the evaporator and the compensation chamber to derive the figure of merit. This derived figure of merit for LHPs successfully predicted the steady-state thermal performance of the tested working fluids within the variable conductance regime. In the constant conductance regime, the differences in the condenser cooling capacity and in the liquid subcooling for different working fluids determined the thermal performance of each working fluid. The limitations and prospects of the proposed figure of merit were discussed in detail.
| Original language | English |
|---|---|
| Article number | 052901 |
| Journal | Journal of Heat Transfer |
| Volume | 138 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2016 May 1 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
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Derivation and Validation of a Figure of Merit for Loop Heat Pipes with Medium Temperature Working Fluids. / Joung, Wukchul; Lee, Jinho; Lee, Sanghyun; Lee, Joohyun.
In: Journal of Heat Transfer, Vol. 138, No. 5, 052901, 01.05.2016.Research output: Contribution to journal › Article
TY - JOUR
T1 - Derivation and Validation of a Figure of Merit for Loop Heat Pipes with Medium Temperature Working Fluids
AU - Joung, Wukchul
AU - Lee, Jinho
AU - Lee, Sanghyun
AU - Lee, Joohyun
PY - 2016/5/1
Y1 - 2016/5/1
N2 - The working fluids of loop heat pipes (LHPs) play an important role in the operation of the LHPs by influencing the operating temperatures and the heat transfer limits. Therefore, the proper selection of a working fluid is a key practice in LHP fabrication, and there has been a high demand for an appropriate index that enables the quantitative comparison of the steady-state thermal performance of the working fluids. In this work, a figure of merit for LHPs was theoretically derived and experimentally verified. In particular, the pressure losses in the LHP operation were balanced with the saturation pressure difference between the evaporator and the compensation chamber to derive the figure of merit. This derived figure of merit for LHPs successfully predicted the steady-state thermal performance of the tested working fluids within the variable conductance regime. In the constant conductance regime, the differences in the condenser cooling capacity and in the liquid subcooling for different working fluids determined the thermal performance of each working fluid. The limitations and prospects of the proposed figure of merit were discussed in detail.
AB - The working fluids of loop heat pipes (LHPs) play an important role in the operation of the LHPs by influencing the operating temperatures and the heat transfer limits. Therefore, the proper selection of a working fluid is a key practice in LHP fabrication, and there has been a high demand for an appropriate index that enables the quantitative comparison of the steady-state thermal performance of the working fluids. In this work, a figure of merit for LHPs was theoretically derived and experimentally verified. In particular, the pressure losses in the LHP operation were balanced with the saturation pressure difference between the evaporator and the compensation chamber to derive the figure of merit. This derived figure of merit for LHPs successfully predicted the steady-state thermal performance of the tested working fluids within the variable conductance regime. In the constant conductance regime, the differences in the condenser cooling capacity and in the liquid subcooling for different working fluids determined the thermal performance of each working fluid. The limitations and prospects of the proposed figure of merit were discussed in detail.
UR - http://www.scopus.com/inward/record.url?scp=84958787544&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84958787544&partnerID=8YFLogxK
U2 - 10.1115/1.4032534
DO - 10.1115/1.4032534
M3 - Article
AN - SCOPUS:84958787544
VL - 138
JO - Journal of Heat Transfer
JF - Journal of Heat Transfer
SN - 0022-1481
IS - 5
M1 - 052901
ER -