No abstract

A water to water heat pump specially designed and instrumented for research has been used to determine the actual coefficients of performance of R11 for condensing temperatures in the range 70°C to 104°C. 101 experimental points were obtained and these lie on a smooth curve with a standard deviation of 6.32 per cent. The results are compared with data previously obtained for R12, R22, R12B1 and R114 on the same equipment. R11 with its relatively high critical temperature of 198°C is potentially an attractive working fluid provided that it can be operated in conjunction with a lubricant which does not facilitate thermal breakdown.

The design of a fixed bed adsorption unit using adsorbent produced from locally available palm kernel shell has been investigated using Microsoft Excel spreadsheet. Various mathematical models were considered but the simpler and more convenient Wheeler-Robell model was adopted in the design. The model was adopted in designing a template with Microsoft Excel Spreadsheet. A Microsoft Excel Spreadsheet was developed for the design. The template was used to determine the design parameters, such as length of column, diameter of bed, bed height and pressure drop across the bed.