Abstract
The technology of adsorption chiller is an efficient way of heat conversion. It can significantly reduce environmental pollution and improve energy efficiency. This paper deals with numerical study of refrigeration systems with silica gel/water pairs with mass recovery. The model is validated with experimental results from the ENERBAT platform. Numerical results are in good agreement with those of experiment. A process of mass recovery is added to study its the effect on the performances of the system. The effect of hot water temperature, cooling water temperature, chilled water temperature and cycle time, on the coefficient of performance (COP), the specific cooling capacity (SCP), the cycled mass, the evaporator outlet temperature and efficiency system are investigated in order to extrapolate the results in the Tunisian climate and to determine their optimum values able to maximize the performance of the system under analysis. The simulation calculation indicates a COP value of 0.7 with a driving source temperature of 85°C in combination with coolant inlet and chilled water inlet temperature of 40°C and 15°C, respectively. The most optimum adsorptiondesorption cycle time is approximately 1240s based on the performance from COP and SCP, achieving a SCP of 400 W/kg.
Highlights
With the increasing economic development and environment protection, adsorption refrigeration technology as the green refrigeration method has received much attention
After 7 minutes, the outlet hot water temperature is approaches her inlet temperature; at this point we have a minimum of heat consumption: the silica gel had heated thoroughly to allow desorption of water vapor
Whereas the cooling water temperature, the inlet temperature decreases during the desorption/ condensation phase and increases during the preheating and precooling phase, because during the condensation /desorption process we need to extract an amount of energy to allow the condensation of desorbed water
Summary
With the increasing economic development and environment protection, adsorption refrigeration technology as the green refrigeration method has received much attention. Environment friendly refrigerants are used in adsorption refrigeration, making the refrigeration system simple and adsorption chiller with low noise performance. In this context, silica gel-water was selected as the adsorbentadsorbate pair. Silica gel can be regenerated at a relatively low temperature It has a large uptake capacity for water which has a high latent heat of evaporation; up to 40% of its dry mass. The potential for the two-bed silica gel-water adsorption chiller was evaluated by a number of researchers [1,2,3,4,5,6,7] This refrigerant couple is widely studied experimentally in the literature
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