Research the efficiency of gravity heat pipe with R134a refrigerant on cabinet dryer
Corressponding author's email:
luannt@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.64.2021.98Keywords:
Gravity heat pipe, cabinet dryer, heat pipe combination dryer, centella asiatica, R134a refrigerantAbstract
The article presents experimental research to investigate the capacity to recover waste heat of the gravity heat pipe-R134a on cabinet dryer under climatic conditions in VietNam. Experiments were performed according to an orthogonal 2-factor matrix. The analytical solution for the mathematical model related to energy equations was obtained using an Engineering Equation Solver program. Scope of the survey: hot air temperature out of the cabinet dryer t = 40oC ¸ 60oC, air velocity v = 0,4 ¸ 1,2 m/s, and centella asiatica is material. Results indicated that by combining the heat pipe into the dryer, the energy efficiency of the cabinet dryer was increased from 6,5% to 14,5% with the temperature range t = 50oC ¸ 60oC. The sensible effectiveness of the heat pipe was obtained from 13,1% to 18,2% and from 8,7% to 12,2% for cases with temperatures of 50oC and 60oC, respectively. With the air temperature t£ 40oC, the heat pipes are almost not working. In the climatic conditions of VietNam with the temperature of the air out of the cabinet dryer from 50oC to 60oC, the gravity heat pipe R134a could be used to recover waste heat.
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