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Category > Applied Sciences Posted 09 May 2017 My Price 5.00

Hot water is flowing at an average velocity of 1.5

Hot water is flowing at an average velocity of 1.5 m/s through a cast iron pipe (k = 52 W/m·K) whose inner and outer diameters are 3 cm and 3.5 cm, respectively. The pipe passes through a 15-m-long section of a basement whose temperature is 15°C. If the temperature of the water drops from 70°C to 67°C as it passes through the basement and the heat transfer coefficient on the inner surface of the pipe is 400 W/m2 ·K, determine the combined convection and radiation heat transfer coefficient at the outer surface of the pipe

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Alpha Geek
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Status NEW Posted 09 May 2017 11:05 AM My Price 5.00

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file 1494328104-Answer.docx preview (140 words )
H-----------ot -----------wat-----------er -----------is -----------flo-----------win-----------g a-----------t a-----------n a-----------ver-----------age----------- ve-----------loc-----------ity----------- of----------- 1.-----------5 m-----------/s -----------thr-----------oug-----------h a----------- ca-----------st -----------iro-----------n p-----------ipe----------- (k----------- = -----------52 -----------W/m-----------·K-----------) w-----------hos-----------e i-----------nne-----------r a-----------nd -----------out-----------er -----------dia-----------met-----------ers----------- ar-----------e 3----------- cm----------- an-----------d 3-----------.5 -----------cm,----------- re-----------spe-----------cti-----------vel-----------y. -----------The----------- pi-----------pe -----------pas-----------ses----------- th-----------rou-----------gh -----------a 1-----------5-m------------lo-----------ng -----------sec-----------tio-----------n o-----------f a----------- ba-----------sem-----------ent----------- wh-----------ose----------- te-----------mpe-----------rat-----------ure----------- is----------- 15-----------°C-----------. I-----------f t-----------he -----------tem-----------per-----------atu-----------re -----------of -----------the----------- wa-----------ter----------- dr-----------ops----------- fr-----------om -----------70Â-----------°C -----------to -----------67Â-----------°C -----------as -----------it -----------pas-----------ses----------- th-----------rou-----------gh -----------the----------- ba-----------sem-----------ent----------- an-----------d t-----------he -----------hea-----------t t-----------ran-----------sfe-----------r c-----------oef-----------fic-----------ien-----------t o-----------n t-----------he -----------inn-----------er -----------sur-----------fac-----------e o-----------f t-----------he -----------pip-----------e i-----------s 4-----------00 -----------W/m-----------2 Â-----------·K,----------- de-----------ter-----------min-----------e
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