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A chiller is providing 5 tons of cooling to an air handler by cooling water transfer between the two devices. The chiller is drawing 3.5 kw of electrical power during this operation. At what rate must the chiller dump energy to the environment (say to a cooling tower) in Btu/hr to satisfy the first law of
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- A chemical plant process a fluid having a flow rate of 5 lb/sec passes through a pipe where heat is transferred at the rate of 50 Btu/sec. How much work can be done by this system if the velocity, enthalpy and the height at the entrance are 100 ft/sec, 1000 Btu/lbm, and 100 ft. respectively. At the exit the values of these quantities are 50 ft/S, 1020 Btu/lbm, and 0 ft. What is the area in the inlet if the specific volume of the fluid is 15 ft3/lb. a. 48.5 Btu/s, 208 in² b. 98.5 Btu/s, 108 in² c. 48.5 Btu/s, 108 in² d. 40.5 Btu/s, 118 in²arrow_forwardIf H is the work output of a heat engine and Q is the total heat input of an engine, then determine its thermal efficiency.arrow_forwardThermodynamicsarrow_forward
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- The “Energy Guide” label of a refrigerator states that the refrigerator will consume $170 worth of electricity per year under normal use if the cost of electricity is $0.125/kWh. If the electricity consumed by the lightbulb is negligible and the refrigerator consumes 400 W when running, determine the fraction of the time the refrigerator will run.arrow_forwardWater is being heated in a closed pan on top of a range while being stirred by a paddle wheel. During the process, 34.59 kJ of heat is transferred to the water, and 8.01 kJ of heat is lost to the surrounding air. The paddle-wheel work amounts to 540.56 N ∙ m. Determine the final energy of the system if its initial internal energy is 11.95 kJ.arrow_forwardTwo parallel shafts whose centers are 10 meters apart are connected by an open belt drive with a V-belt with a groove angle of 30°. The diameter of the larger pulley is 1000 mm and that of the smaller pulley is 400 mm. The smaller pulley is running at 1000 rpm to deliver 10 kW of power. The mass of the belt is 1 kg/m. Taking centrifugal tension into account, determine the minimal cross-sectional area if the allowable tensile stress of the belt is 5 MPa. The coefficient of friction between the belt and the pulleys is 0.25.arrow_forward
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