3. A horizontal aluminium radial fin copper heat pipe is constructed from a 90cm-long pipeto recover heat in a heat pipe heat exchanger, as shown in the figure. The water is theworking fluid in the heat pipe. The inner and outer diameters of the heat pipe are 9 mmand 50 mm (ri =5 mm), respectively. The diameter of the vapor space is 7 mm. Thealuminium (kat = 205 W/mK) fin thickness and outer fin diameter are 0.1 mm and 40 mm%3!(r2= 20 mm) and the fin spacing is 2 mm. The evaporator, adiabatic region and condenserof the heat pipe are 20 cm cach and the wicking structure consists of two layers of #200-mesh copper screen with the wire diameter of 0.0012 in of the heat pipe. The copper hasthe thermal conductivity of 401 W/mK. The evaporator of the heat pipe is immerged in astream of airflow at 40°C with the heat transfer coefficient of 27 W/m'K. The condenseris immerged in a stream of airflow at 23°C with the heat transfer coefficient of 27W/m'K, respectively. (a) The total thermal resistance of the internal heat pipe. (b)Detemine the number of fins and overall fin efficiency using Figure 2.7. (c) Determinethe total heat transfer through the heat pipe.d,Th.Ta/Th.d,

Answered: Image /qna-images/answer/6d1ee08b-f99d-4e80-b9d7-b36910f238e7.jpg

Answered: Determine the number of fins and…

Determine the number of fins and overall fin efficiency using Figure 2.7. (c) Determine the total heat transfer through the heat pipe.

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter8: Direct Use Of Solar Energy

Section: Chapter Questions

Problem 5P

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