Agiven turbine runs at a maximum efficiency of 87% when discharging 200 cfs at 150 rpm under a net head of 81 ft. thus turbine drives an electric generator that is developing 60-cycle current. what would be the break horsepower, speed, and flow rate, of this same turbine under a net head of 40.5 ft for homologous conditions?

Aheat pump with refrigerant-134a as the working fluid is used to keep a space at 25°c by absorbing heat from geothermal water that enters the evaporator at 500c at a rate of 0.065 kg/s and leaves at 40°c. the refrigerant enters the evaporator at 20°c with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. the refrigerant loses 300 w of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at 1.4 mpa at the same entropy as the inlet. determine: (a) the degrees of subcooling of the refrigerant in the condenser, b)-the mass flow rate of the refrigerant . (c) the heating load and the cop of the pump, and d)-the theoretical minimum power input to the compressor for the same heating load.

Determine the heat loss per hour from a wall of a build- ing when the wind is blowing parallel to its surface with a speed of 2 km/hour. the wall is 5 metre long and 3 metre high. tempe rature of the wall is 25°c and air temperature is 5°c.

The high degree of flatness achieved in modern architectural plate glass is the result of the float glass process in which the layer of glass is drawn across a bath of molten tin. ( true , false )