Nghiên cứu thực nghiệm ảnh hưởng của tỷ lệ nạp và góc nghiêng đối với hoạt động của ống nhiệt trọng

NGHIEN Cflu - TRAO DOI

I NGHIEN CU'U THI/C NGHIEM ANN HU'dNG CUA TY LE NAP

VA GOC NGHIENG DOI v6\ HOAT DONG CUA ONG NHIET

TRONG TRU'O'NG CO CANH BEN NGOAI DE THU HOI NHIET THAI

EXPERIMENTAL STUDY THE IMPACTS OF INCLINATION AND FILLING

RATIO ON CIRCULAR-FINNED THERMOSYPHON HEAT PIPE USED

FOR WASTE HEAT RECOVERY

Nguyen Trung Kien, Le Chi Hiep

Tn(6ng Dai hpc Bach Khoa TP. Ho Chi Minh

T6M TAT

Ong nhiet Id mot thiet bi co khd ndng truyen nhiet rdt ldn nhd vdo qud trinh bien doi pha.

Trong bdi bdo ndy, mgt ong nhiet trgng trUdng co cdnh d ben ngodi ditng cho viec thu hoi nhiet, thdi

dugc che tao de phuc vu cho viec nghien cilu dnh hudng ciia ty le nap vd gdc nghieng doi vdi hieu

qud hoat dgng ciia ong nhiet. Mdi chdt dUdc sddung trong dng nhiet Id nUdc nguyen chdt. Di nghien

cdu dnh hUdng cda ty le nap, dng nhiet dddc ddt thdng ddng vd ty le nap thay doi theo hon mite.

10%, 20%, 30%, 40%. De nghien cdu dnh hudng cua gdc nghieng, ong nhiet dUdc nap vdi tyle 30%

vd gdc nghieng thay ddi theo ndm miic: Sif, 6CP, 70^, 80°, 90°. Ket qud cho thdy, ty le nap toi Uu cda

dng nhiet Id 30% khi dng nhiet ddt thdng ditng vd gdc nghieng tdi Uu Id 7QF vdi ty le nap 30%.

Tii Idioa: Ong nhiet; 6ng nhiet trgng trudng; Thu hdi nhiet thdi; Ty le nap; Gdc nghieng.

The heat pipe is a device of very high thermal conductance due to phase changes. In this

report, a circular-finned thermosyphon heat pipe (used for waste heat recovery) was constructed to

study the impacts of filling ratio and inclination on the heat pipe's efficiency. The working fluid was

water. To study the impacts of filling ratio, the heat pipe was placed in an erect position with the filling ratio

changing at four levels: 10%, 20%, 30%, 40%. To study the impacts of inclination, the filling ratio was

30%, and the inclination changed at 5 levels: SCf, 50", 7(f, 80", Sif. The results show that the optimum

fillingratio was 30% when the heat pipe was place in an erect position; the optimum inclination was

70" with the filling ratio of 30%.

Keywords: Heat pipe; Thermosyphon; Waste heat recovery; Filling ratio; Inclination.

ISSN 0866 - 7056

TAP CHl CO KHi VIET NAM. S6 11 nam 2014

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