A piston cylinder contains 1 kg of dry air at a temperature of 200°C and pressure 300 kPa. It undergoes an isothermal expansion and 20 kJ of work is done to raise the piston. 5 kJ of work is added to the air using a paddle wheel. The system is the dry air. a. Reduce a 1st Law energy balance for this system b. Which is true? (1) Heat is transferred into the cylinder (2) Heat is transferred out of the cylinder (3) No heat is transferred in/out of the cylinder c. Calculate Qin and Qout

A piston cylinder contains 1 kg of dry air at a temperature of 200°C and pressure 300 kPa. It undergoes an isothermal expansion and 20 kJ of work is done to raise the piston. 5 kJ of work is added to the air using a paddle wheel. The system is the dry air. a. Reduce a 1st Law energy balance for this system b. Which is true? (1) Heat is transferred into the cylinder (2) Heat is transferred out of the cylinder (3) No heat is transferred in/out of the cylinder c. Calculate Qin and Qout

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.8P

See similar textbooks

Similar questions

1. Moist air enters a refrigeration coil at 89 F dry-bulb temperature and 65 F thermodynamic wet bulb temperature at a rate of 14oo cu ft per min. The surface temperature of the coil is 55 F . If 3.5 tons of refrigeration are available, find the dry bulb and wet bulb temperatures of the air leaving the coil. Assume sea level pressure.
A classroom type room with 45students taking an exam in thermodynamics is expected to release a body heat of about 8kJ/hr per person. In order to compensate this heat dissipation, an air-conditioning unit is to be installed. If specific heat capacity and density of air is 1.0062kJ/kg-K and 1.2kg/m3, determine the volume of air flow required in examination room if the air is to be cooled down from 290C to 200C. a. 8.5177Li/s b. 9.1262Li/s c. 9.2022Li/s d. 9.0501Li/s
12. A classroom type room with 45students taking an exam in thermodynamics is expected to release a body heat of about 8kJ/hr per person. In order to compensate this heat dissipation, an air- conditioning unit is to be installed. If specific heat capacity and density of air is 1.0062kJ/kg-K and 1.21kg/m3, determine the volume of air flow required in examination room if the air is to be cooled down from 29°C to 20°C. a. 8.5177Li/s b. 9.1262Li/s c. 9.2022Li/s d. 9.0501Li/s
A 10 kg/s of air enters the theater at 16oC. The theater is to be maintained at 27oC DB and 20oC WB. If the sensible heat ratio is 0.71, what is the latent heat load of the theater?
Consider a large classroom on a hot summer day with 150 students, each dissipating 60 W of sensible heat. All the lights, with 6.0 kW of rated power, are kept on. The room has no external walls, and thus heat gain through the walls and the roof is negligible. Chilled air is available at 15°C, and the temperature of the return air is not to exceed 25°C. Determine the required flow rate of air, in kg/s, that needs to be supplied to the room to keep the average temperature of the room constant.
One pound of air (consider here a perfect gas) with an initial temperature of 200F is allowed to expand without flow between pressures of 80 and 45 psia. Which of the three processes, pv=c, pv^k=c ??? pv^1.5=c will produce the maximum work with minimum heat supplied?
A 10 metric tons ice plant using ammonia refrigerant operates between evaporator and condenser temperature of -20°C and 35°C, respectively. The ice plant is to produce ice at -12°C from water at 30°C in 24 hrs. Assuming losses to be 18% of the heat absorbed from water, determine the: a.) Total amount of heat needed to absorbed by the evaporator in kW b.) Power required by the compressor in kW
Winter air is heated & humidified thru steam heated coil and humidified using water sprayer.Air is flowing at a rate of 750 cubic meter per minute. Winter air is initially at 10 C dry bulb and 90 % RH. The final condition of air after the process is 30 C dry bulb & 60 % RH. Consider normal atmospheric pressure. Determine: a) rate of saturated steam injected in the sprayer per second with steam temperature of 30 C. Can you upload also the pyschrometric chart please
A refrigerator is connected to a generator powered by a fuel with a calorific value of 35000 kJ/kg and a density of 0.85 g/cm3 . The inside temperature of the refrigerator is 0°C, and the outside temperature is 20°C. a. How much work is required to freeze 500 g of water? ΔfreezingH° = 6.02 kJ mol– 1 ) b. How much internal energy change occurs during the process? c. Since the generator consumes 5 L of fuel per hour, calculate the thermal efficiency of this engine.
Consider the heating of water in a pan on a top of a range. If 24 kJ of heat is transferred to the water from heating element and 6 kJ of it is lost from the water to the surrounding air. Determine;(a) the net heat transfer to the water,(b) the efficiency for boiling water.
Air enters a cooling coil at the rate of 5000 cfm (2.4 m3/s) at 80 F (27 C). db, 68 F (20 C) wb and sea-level pressure. The air leaves the coil at 55 F (13 C) db, 54 F (12 C) wb. (a) Determine the SHF and the apparatus dew point. (b) Compute the total and sensible heat transfer rates from the air.
1.A piston-cylinder containing air expands at a constant pressure of 150 KPa from a temperature of 285 K to a temperature of 550K.The mass of air in the cylinder is .05 Kg. Determine the system heat and work for the process