Abstract
Problem statement: The objective of this study was to optimize the geo metrical parameters of a bubble pump integrated in a solar flat plate c ollector. Approach: This solar bubble pump was part of an ammonia/water/helium (NH 3/H 2O/He) absorption-diffusion cooling system. Results: An empirical model was developed on the basis of momentum, mass, material equations and energy balances. The mathematical model was solved using the simulation tool Engineering Equation Solver (EES). Conclusion/Recommendations: Using metrological data from Gabes (Tunisia) vario us parameters were geometrically optimized for maximum bubble pump efficiency which was best for a bubble pump tube diameter of 6 mm, a tube length of 1.5 m, an inclination to the horizontal between 30 and 50° of the solar flat plate collector and a submergence ratio between 0.2 and 0.3.
Highlights
The influence of the cycle configuration on the performance of an absorption-diffusion cooling system has been investigated by various researchers. Zohar et al (2007) compared the performance of two fundamental configurations of a Diffusion Absorption Refrigeration (DAR) cycle, with and without condensate sub-cooling prior to the evaporator entrance
Conclusion/Recommendations: Using metrological data from Gabes (Tunisia) various parameters were geometrically optimized for maximum bubble pump efficiency which was best for a bubble pump tube diameter of 6 mm, a tube length of 1.5 m, an inclination to the horizontal between 30 and 50° of the solar flat plate collector and a submergence ratio between 0.2 and 0.3
They analyzed the performances of the two cycles by computer simulations and concluded that the DAR cycle without condensate sub-cooling, at higher evaporator temperature of about 15°C, shows higher COP of about 14-20% compared with the DAR cycle with condensate sub-cooling
Summary
The influence of the cycle configuration on the performance of an absorption-diffusion cooling system has been investigated by various researchers. Zohar et al (2007) compared the performance of two fundamental configurations of a Diffusion Absorption Refrigeration (DAR) cycle, with and without condensate sub-cooling prior to the evaporator entrance. Zohar et al (2007) compared the performance of two fundamental configurations of a Diffusion Absorption Refrigeration (DAR) cycle, with and without condensate sub-cooling prior to the evaporator entrance. They analyzed the performances of the two cycles by computer simulations and concluded that the DAR cycle without condensate sub-cooling, at higher evaporator temperature of about 15°C, shows higher COP of about 14-20% compared with the DAR cycle with condensate sub-cooling. The first configuration gave the lowest performance, heat was supplied directly to the rich solution
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