Experimental Study of Absorption Heat-Transformer with Vapor Absorption inside Vertical Spiral Tube
In this paper, a new AHT with falling film of aqueous LiBr solution inside vertical spiral tubes is installed in our laboratory. The variations of coefficient of performance (COP), thermal efficiency (Eth) and the heat transfer coefficient of the absorber at different falling film flow rate, hot water flow rate and operating temperature are investigated experimentally. The results demonstrated that the coefficient of performance and thermal efficiency of the system decrease with increase in the flow rate of LiBr solution, and the effect of flow rate of hot water on COP and Eth is very small. The available COP in our experiments is higher than 0.4. The heat and mass transfer coefficient of the absorber increase with increase of the flow rate of solution, up to 400W/m2/K and 0.013 kg/m2/s (temperature of waste heat is 90 ℃); The heat transfer coefficient of absorber increases with increase of the temperature of waste heat, and decreases with increase of the cooling water temperature. Meanwhile, the computer code ABSIM (Absorption Simulation) is used to simulate the AHT systems.
Absorption heat-transformer Falling film Spiral tube ABSIM simulation
Xue-hu MA Zhong LAN Zhaolong HAO Qun-chang WANG Shoushi BO Tao BAI
Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-4
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）