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