power rating of the compressor motor – Cheap Research Essays

An ice plant produces 10 tonnes of ice per day at 0°C, using water at room temperature of 20°C. Estimate
the power rating of the compressor motor if the C.O.P. of the plant is 2.5 and overall electromechanical
efficiency is 0.9.
Take latent heat of freezing for water = 335 kJ/kg
Specific heat of water = 4.18 kJ/kg.

READ ALSO : In June 1985, a laser beam was sent out from the Air Force Optical Station on Maui, Hawaii, and reflected back from the shuttle Discovery as it sped by 354 km overhead. The diameter of the central maximum of the beam at the shuttle position was said to be 9.1 m, and the beam wavelength was 500 nm. What is the effective diameter of the laser aperture at the Maui ground station? (Hint: A laser beam spreads only because of diffraction; assume a circular exit aperture.)