Adsorption refrigeration is one method of using waste heat/solar thermal power to generate cooling. However, the current performance of adsorption chillers needs to be improved. The key to optimising the design of the chiller is to understanding the adsorption parameters for different working pairs. In these parameters, the most important ones are: (1) equilibrium adsorption capacity and (2) the kinetic adsorption rate. Based on measurements of capacity and adsorption rate coefficient, parameters used in the design of the chiller like the length of the fin, the thickness of the adsorbent bed and the cycle time were studied computationally. Therefore, this thesis concerns the measurement of adsorption process parameters experimentally, and thereafter, the modelling of a chiller design. The equilibrium capacities of silica-gel/water and two types of activated carbon cloth (Chemviron Tm FM10 and FM100)/methanol were measured by thermogravimetric experiments in the temperature range of 30 to 80 'C . The isotherms of silica-gel/water were fitted by Henry's Law (Uptake<35%) and the isotherms for two types of ACC/methanol were fitted by the Toth equation. A new torsion balance was designed and built to measure the kinetics of the working pairs under different temperatures. By testing this newly designed balance with different sample temperatures and materials, different rate coefficients were obtained. The experiments also indicated that the rate coefficient for adsorption of silica-gel/water increased with temperature: the adsorption rate coefficient doubled following heating from 30'C to 60"C . On the other hand, the rate coefficient of the ACE/methanol pairs appeared to be unaffected by the temperature of the adsorbent. A discussion of experimental error and underlying physic is given in this thesis. Measurements were used in a model of a coated f10 system. Fin length, bed thickness and cycle time were varied in order to get an optimised solution. The performance changes caused by different parameters are presented and discussed.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:601213 |
| Date | January 2012 |
| Creators | Yin, Fan |
| Publisher | University of Bristol |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
Page generated in 0.0022 seconds