An adiabatic pump is used to increase the pressure of water from 100 kPa to 500 kPa at a rate of 400 L/min. If the efficiency of the pump is 75 percent, the maximum temperature rise of the water across the pump is (a) 0.096° C (b) 0.058° C (c) 0.035° C (d ) 1.52° C (e) 1.27° C

A frictionless piston-cylinder device initially contains 80 L of liquid saturated with refrigerant 134a. The piston has free movement, and its mass is such that it maintains a pressure of 500 kPa on the refrigerant. The refrigerant is then heated until its temperature rises to 70 ° C. Calculate the work done during this process.

A commercial airliner is flying at an altitude where the temperature and pressure of the air are -50°C and 26.5 kPa. An engine-driven compressor will take this air at T= -50°C, P₁ = 26.5 kPa and compress it to P₂ = P₂ = 85.0 kPa to pressurize the cabin. The air will be very hot when it exits the compressor, so a heat exchanger will be used to cool the air to T, = 20°C before it enters the cabin. Cold air at T₁ = -50°C will be used in the heat exchanger to cool the cabin air, and this air will exit the heat exchanger at T = 20°C (this air will be used to heat the cargo bay). The mass flow rate of the air delivered to the cabin is 0.80 kg/s and the compressor efficiency is 75%. Model the air as an ideal gas having constant specific heat, using 300 K values from Cengel's tables posted on Canvas. a) Find the actual temperature of the air exiting the compressor and the power input to the compressor (answers: 67.6°C and 94.5 kW). b) Find the rate of heat transfer in the heat exchanger and…

CO2 is needed in a surgical suite for abdominal laparoscopic surgery. You have already designed a nozzle to step down the pressure from the gas cylinder to the delivery hose. The well-insulated delivery hose has a 2.2 mm inner diameter. The inlet conditions to the delivery hose are 103 psia and 17°C. Typically, the surgeon uses 4 to 6 L/min of gas at pressures between 10 to 20 mm Hg to inflate the peritoneal cavity; however, the delivery system must be able to provide flow rate of 17.5 L/min at 20.0 mm Hg for safety. The surgeon will use a pin valve to control the flow rate and maintain the operating space. The gas temperature should not be any colder than 10°C when delivered to patient, or tissue damage might occur. Determine the acceptable delivery hose length to meet the surgical criteria. State assumptions.

A site is being considered for wind power generation. At this site, the wind blows steadily at 9 m/s for 2,579 hours per year. Assuming the wind velocity is negligible at other times for simplicity, determine the kWh/year that can be produced at the site for a turbine with a mechanical efficiency of 100% and an effective flow area of 5 m2. Use a value of 1.25 kg/m3 for the density of the air. Give your answer in killowatt-hours per year (kWh/year). Hint: I reccomend starting by finding the kinetic energy (kJ/kg) of the wind. Hint 2: Multiply the power generation (kW) by the number of hours of wind per year (h/year) to get kWh/year.

Two spur gears are to have a ratio of 9:3 and a 7mm module. If the center distance is to be approximatively 200mm, calculate the following:o Circular pitch value;o Number of teeth on the wheel (gear);o Number of teeth of the pinion;o Pitch circle diameter of the gear;o Pitch circle diameter of the pinion;

Determine the work required (in kJ/kg) for a pump that is used to increase the pressure of a liquid water stream from 100 kPa to 1500 kPa isothermally at 20 °C. The specific heat of water (C) is 0.0035 kJ/kg.K. its specific volume is 0.001031 m³/kg and its volume expansivity (B) is 250x10 K

Q2- Consider two ways to compress 2 kg/s of air (an ideal gas with R = 0.287 kJ/kg K and constant heat capacities: cv = 0.718 kJ/kg·K, and cp = 1.005 kJ/kg K) from an inlet Pin = 100 kPa and Tin = 20°C to an outlet Pout = 50 MPa and a heat loss of 150 kW. In this case the outlet temperature is Tout =700°C. Find the work in this case

2. Air whose density is 0.078 enters the duct of an air-conditioning system at a volume flow rate of 450 ft3 /min. If the diameter of the duct is 10 in, determine the velocity of the air at the duct inlet and the mass flow rate of air.

Determine the change in entropy (BTU/R) in an isothermal process having an initial volume of 18 cu ft and a final volume of 46 cu ft. The mass is 58 lb and the specific heat is 0.24 BTU/b-R