Numerical Study of a Three-Bed Adsorption Chiller Employing an Advanced Mass Recovery Process with Different Cycles (Published)
In this paper, the performance comparison between two different cycles has been numerically studied. In cycle1, the configuration of beds in the three bed chiller with mass recovery were taken as uniform in size but in cycle2 the configuration of Hex3 is taken as half of Hex1 or Hex2 (where Hex1 and Hex2 are identical). In the present numerical solution, the heat source temperature variation is taken from 70°C to 90°C (for both cycle) and along with coolant inlet temperature at 30°C and the chilled water inlet temperature at 14°C. Silica gel-water is chosen as adsorbent-refrigerant pair. In the new strategy, if any one bed (3rd bed) is connect with the evaporator during pre-heating or pre-cooling time then it will give better performance than that of existing system. In this strategy, mass recovery process also occurs in all bed. Results show that the cooling capacity (CC) and coefficient of performance (COP) of the cycle1 is much better than that of the cycle2 in the range of heat source temperature from 700C to 900C.
Keywords: Mass Recovery, Renewable energy sources, Silica Gel-Water, coefficient of performance, cooling capacity
Numerical Study of a Three-Bed (Equal Bed) Adsorption Chiller with Mass Recovery (Published)
In this paper, the performance of a three-bed (equal bed) adsorption chiller with mass recovery has been numerically studied. The mass recovery scheme is used to improve the cooling effect and a CFC-free-based sorption chiller driven by the low-grade waste heat or any renewable energy source can be developed for the next generation of refrigeration. Silica gel/water is taken as adsorbent/adsorbate pair for the present chiller. The three-bed adsorption chiller comprises with three adsorber/desorber heat exchanger, one evaporator and one condenser. In the present numerical solution, the heat source temperature variation is taken from 500C to 650C along with coolant inlet temperature at 300C and the chilled water inlet temperature at 140C. In the new strategy, mass recovery process occurs in all beds. The configuration of beds in the three bed chiller with mass recovery were taken as uniform in size. A cycle simulation computer program is constructed to analyze the influence of operating conditions (hot and cooling water temperature) on COP (coefficient of performance), CC (cooling capacity) and chilled water outlet temperature.
Keywords: Adsorption Chiller, Cooling Capacity and Coefficient of Performance, Mass Recovery, Renewable energy sources, Silica Gel-Water
Numerical Study of a Three-Bed (Unequal Bed) Adsorption Chiller with Mass Recovery (Published)
In this paper, the performance of a three-bed (unequal bed) adsorption chiller with mass recovery has been numerically studied. The mass recovery scheme is used to improve the cooling effect and a CFC-free-based sorption chiller driven by the low-grade waste heat or any renewable energy source can be developed for the next generation of refrigeration. Silica gel/water is taken as adsorbent/adsorbate pair for the present chiller. The three-bed adsorption chiller comprises with three adsorber/desorber heat exchanger, one evaporator and one condenser. In the present numerical solution, the heat source temperature variation is taken from 500C to 900C along with coolant inlet temperature at 300C and the chilled water inlet temperature at 140C. In the new strategy, mass recovery process occurs in all beds where the configuration of Hex1 and Hex2 are identical, but the configuration of Hex3 is taken as half of Hex1 or Hex2. A cycle simulation computer program is constructed to analyze the influence of operating conditions (hot and cooling water temperature) on COP (coefficient of performance), CC (cooling capacity) and chilled water outlet temperature.
Keywords: Adsorption Chiller, Cooling Capacity and Coefficient of Performance, Mass Recovery, Renewable energy sources, Silica Gel-Water