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A Novel Analytical Modeling of a Loop Heat Pipe Employing Thin-Film Theory: Part II—Experimental Validation

1
Department of Fire & Disaster Prevention Engineering, Changshin University, 262 Palyong-ro, Masanhoewon-gu, Changwon-si, Gyeongsangnam-do 51532, Korea
2
School of Aerospace and Mechanical Engineering, Korea Aerospace University, Hwajeon, Goyang, Gyeonggi-do 10540, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(12), 2403; https://doi.org/10.3390/en12122403
Received: 18 April 2019 / Revised: 11 June 2019 / Accepted: 19 June 2019 / Published: 22 June 2019
(This article belongs to the Special Issue Advances in Heat Transfer Enhancement)
Part I of this study introduced a mathematical model capable of predicting the steady-state performance of a loop heat pipe (LHP) with enhanced rationality and accuracy. Additionally, investigation of the effect of design parameters on the LHP thermal performance was also reported in Part I. The objective of Part II is to experimentally verify the utility of the steady-state analytical model proposed in Part I. To this end, an experimental device comprising a flat-evaporator LHP (FLHP) was designed and fabricated. Methanol was used as the working fluid, and stainless steel as the wall and tubing-system material. The capillary structure in the evaporator was made of polypropylene wick of porosity 47%. To provide vapor removal passages, axial grooves with inverted trapezoidal cross-section were machined at the inner wall of the flat evaporator. Both the evaporator and condenser components measure 40 × 50 mm (W × L). The inner diameters of the tubes constituting the liquid- and vapor-transport lines measure 2 mm and 4 mm, respectively, and the lengths of these lines are 0.5 m. The maximum input thermal load was 90 W in the horizontal alignment with a coolant temperature of 10 °C. Validity of the said steady-state analysis model was verified for both the flat and cylindrical evaporator LHP (CLHP) models in the light of experimental results. The observed difference in temperature values between the proposed model and experiment was less than 4% based on the absolute temperature. Correspondingly, a maximum error of 6% was observed with regard to thermal resistance. The proposed model is considered capable of providing more accurate performance prediction of an LHP. View Full-Text
Keywords: loop heat pipe; experimental validation; thermal resistance; steady-state thermal performance; relative error; analytical modeling loop heat pipe; experimental validation; thermal resistance; steady-state thermal performance; relative error; analytical modeling
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Jung, E.G.; Boo, J.H. A Novel Analytical Modeling of a Loop Heat Pipe Employing Thin-Film Theory: Part II—Experimental Validation. Energies 2019, 12, 2403.

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