The evaporator was heated by hot water 60, 70 and 80oC, heat input both pipes behave almost
similarly over all The angle work of pipe ranges. For a case modifying the inclination angle of evaporator and condenser sections 0 60 90o pipe we can observe The angle work of pipe as the optimum angle 20° to 30° 
of heat transfer with the maximum efficiency of 67% and that
of for R134a pipe it is The angle work of pipe 0° to 150°