Chapter 6, Problem 6.77P

Use the adiabatic pressure vs. volume relation to find a change in pressure and the work done on a gas.

If the container is placed in a colder environment, how will it affect the actual heat transfer and the irreversibility of the system?

Steam at 3.8 MPa with twenty five percent moisture undergoes a constant pressure process until the temperaturebecomes 350C. Calculate:a. Non-flow workb. Steady flow workc. Heat transferred.d. Change in internal energy

An office is to be air conditioning for 50 employees when the outdoor conditions are 30 C° DBT and 75 % RH. If the quantity of outdoor air supplied is 0.4 m' /min/person. Assume that required comfort conditions are 20 C° DBT and 60 % RH and the air is conditioned first by cooling and dehumidification until saturation and then heating. Draw the pshychrometric figure for the processes and find the following: 1- Capacity of the cooling coil in tons of refrigeration. 2- Amount of water removed by the eliminator per hour. 3- If the heating coil surface temperature is 25 C° then find the by-pass factor of the heating coil.

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3 kg of steam initially at 2.5 MPa and a temperature of 370 degrees Celcius have 2460 kJ removed at a constant temperature until the quality is 90%. Find the pressure when dry saturated steam exist and the work.

Find the heat energy(flow) in ‘Joules’ required to prepare a coffee in an electric kettle with 0.5 litre (1litre = 10-3 m3) of water which is heated from 30oC to 85oC? Take density of water as 1000 kg /m3 and Specific heat of water as 4.187 kJ/kg o K.

3kg of Co2 expanded in a stationary piston cylinder through a polytropic process from 30 degree Celsius and 250 kpa to 100kPa pressure. If the polytropic exponent, n = 1.45, find the total work, total heat transferred, total kinetic energy change and internal energy change