In the Mechanical Heat Pump experiment, the following data were collected, the COP will be equal to: power input Cpw (watts) the water mass the water inlet the water outlet flow rate (g/s) temperature (°C) temperature (°C) (kJ/kg.K) 25 20 33 350 4.180 Select one: a. 3.88. O b. 0.257 С. 2.57 O d. 0.388
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- Blowing air from 3 separate vents to a car gallery where the indoor air temperature is 22 °C and the supply air temperature is 45 °C.is sent. The air flow rate of each culvert is 5000 m3/h. According to this situation, what is the hourly heat loss of this hall? (Weather'sdensity= 1.2kg/m3, specific heat of air= 1.005 kj/kgK) A.425056 kj/hB.517080 kj/hC.416070 kj/hD.516175 kj/hE.456178,9 kj/hCrude oil, Cp = 1.9 kJ/(kg.K), flows at a rate of 0.32 kg/s through the inner pipe of a tube-in-tube heat exchanger and it is heated from 29 °C to 96 °C. Another hydrocarbon, Cp = 2.50 kJ/(kg. K), enters at 240 °C. The overall coefficient of heat transfer is found to be 4200 W/(m?K). Determine for a minimum temperature difference of 20 °C between the hot and cold Nuids; a) the LMTD for parallel flow and for counterflow heat exchamger; b) the surface area for both heat exchanger configurations; c) mass Now rate of hot Nuid for both heat exchanger configurations.A forced draft centrifugal fan draws air at 1.32 cubic meter/sec towards a combustion chamber of a steam generator. The static pressures are 15mm. water below atmospheric at suction and 10mm. water above atmospheric at the discharge. The inlet duct is 30cm in diameter and the discharge duct is 27cm in diameter. The fan mechanical efficiency is 70%. The air is measured at 25 degrees Celsius and 760mmHg. Determine: a. the Air Power in kW 0.664 0.464 0.546 b. the Brake Power in kW 0.546 0.464 0.664 c. the static efficiency 50.00 48.77 52.03
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- Energy balance results (in kW) obtained for the same medium speed single cylinder diesel engine are reported in the following table. For case 1, if the coolant temperature is 105 °C at the outlet of the engine and the volumetric flow rate is 0.22*10-3 m3/s, the temperature of the coolant at the inlet is (in °C): (The coolant is considered water with a density 999 kg/m3 and a specific heat 4.2 k/kg.K). Case N (rpm) bmep (bar) W. O ambient Q ahast shaft 2.2 4.2 19.1 60.3 9.90 3.52 1 500 7.1 24.5 23.8 500 6.1 3.6 5.2 400 3.50 4.9 4.1 1.4 Select one: O a. 142.1 O b. 112.7 O c. 97.31 O d. 87.2 O e. 370.3135 - An electronic device will be cooled by a fan with a volumetric flow rate of 0.34 m³/min. If the air density is 1.2 kg/m³ and the average speed of the air is not desired to exceed 100 m/min, what would be the outer diameter of the fan? a) 6.5cm B) 7.0cm NS) 7.5 cm D) 7.2cm TO) 8.0cm4.) A pump in a municipality's water-supply system receives water from the filtration beds and pumps it up to the top of a water tower. The tower's height is 35 m, and the inlet piping to the pump is 2 m below the pump's intake. The water temperature is 20°C, measured at both the inlet and discharge from the pump. The mass flow rate through the pump is 100 kg/s, the diameter of the inlet piping is 25 cm, and the diameter of the discharge piping is 15 cm. Assuming that there is no heat transfer and no change in internal energy of the water, determine the power required by the pump
- A sewage aeration blower running at 3,500 rpm is designed to deliver 34,000 m3/hr of air from 20°C and 1.03 kg/cm2 atmospheric pressure to a discharge pressure of 1.56 kg/cm2 with an efficiency of 70%. On a hot summer day, the atmospheric temperature rises to 43°C but the barometric pressure does not change. It is desired to vary the blower speed to maintain the same discharge pressure. Determine the blower speed, in RPM, for the summer operation.Determine the Brake Horsepower required, assuming that the efficiency remains constant and assume a mechanical efficiency of 0.9 (k = 1.4 for air).Determine corresponding flow in nominal meter cube per hour.A sewage aeration blower running at 3,500 rpm is designed to deliver 34,000 m3/hr of air from 20°C and 1.03 kg/cm2 atmospheric pressure to a discharge pressure of 1.56 kg/cm2 with an efficiency of 70%. On a hot summer day, the atmospheric temperature rises to 43°C but the barometric pressure does not change. It is desired to vary the blower speed to maintain the same discharge pressure. Determine the blower speed, in RPM, for the summer operation. Determine corresponding flow in nominal meter cube per hour. Determine the Brake Horsepower required, assuming that the efficiency remains constant and assume a mechanical efficiency of 0.9 (k = 1.4 for air).A ventilating fan discharges 5 cubic meter/sec of air through a 87cm diameter duct against a static pressure head of 26mm water. Barometric pressure is 740mmHg. The air temperature is 29 degrees Celsius. Use water density equal to 964 kg/cubic meter. If the input power to the fan is 2.8 kW, determine the following: a. the Air Power in kW 1.484 1.238 1.632 b. the mechanical efficiency 55.67 62.72 52.98 c. the static efficiency. 41.32 45.54 36.83