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THE INFLUENCE OF AIR DISTRIBUTORS ON HEAT TRANSFER COEFFICIENT IN FLUIDIZED BED OF HEAT PIPE HEAT EXCHANGER | ||
| AL-TAQANI | ||
| Article 1, Volume 19, Issue 2, 2006, Pages 135-149 | ||
| Author | ||
| Amer M. Al-Dabagh | ||
| Abstract | ||
| Heat exchanger made of heat pipes elements immersed in a fluidized bed represents one of the most economic devices used in recovery of waste heat energy. In the present work ten copper heat pipes (each 22.2mm diameter and 550 mm length), fixed in staggered arrangement with (175mm) static bed height, and (176,353,707μm sand mean particle diameter) were used . Two types of air distributors (bubble cap and perforated plate) were used with an open area of (21.6%, 6.36%, 3.97%). The study covers the air mass velocity from (0.31 to 0.57 Kg/m2 Sec), with hot bed temperature of 160Co. The results show that the overall heat transfer coefficient for the heat exchanger using bubble cap distributor is slightly higher than that for perforated plate, while the power consumption was greater by 30% for bubble cap distributor. Bubble cap distributors pressure drop was 90% greater than perforated plate distributor for the same operating conditions. At the same time , it shown that heat transfer coefficient is increased with open area increase, while opposite response was found for power consumption . | ||
| Keywords | ||
| Fluidization; Heat exchanger Heat distribution; Power consumption | ||
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