International Journal of Energy Research, Vol.42, No.14, 4402-4416, 2018
Parametric analysis on the performance of an experimental ammonia/lithium nitrate absorption cooling system
The present study reports the experimental results of a new absorption cooling system utilizing stainless steel plate heat exchangers in all the main components. The system operated with the ammonia-lithium nitrate working pair. Several parametric analyses were performed in order to investigate the effect of the generation and condensation temperatures, solution mass flow rate, solution volume and expansion valve aperture on the cooling power, evaporation temperatures, and coefficient of performance (COP). Generation temperatures varied from 80 degrees C to 95 degrees C, while condensation temperatures varied between 20 degrees C and 32 degrees C. The system achieved a cooling power of 3.1kW, cooling temperatures as low as 6 degrees C, and internal coefficients of performance of approximately 0.62. The cooling power increased 20.3% with an increment of the solution mass flow rate from 1kg/min to 4kg/min. From the expansion valve analysis, it was found the cooling power varied from 0.28 to 2.29kW while the COP varied from 0.032 to 0.23 for the corresponding test conditions.