Which one of the following assumptions is NOT included in Air-Standard analysis? Combustion is replaced by external heat transfer.   Processes are considered to be internally reversible.   There is no exhaust but a constant volume heat transfer.   The air, fuel and burnt fuel are all modeled as an ideal gas.   Specific heats are constant at ambient temperature values.

4.3 Outside air (100°F/75°F) flowing at 1000 cfm is mixed with return air (75°F/63°F) at 5000 cfm. Find the mixed air conditions (db, RH, wb, v, and h). Sketch on the psychrometric chart.

A heat engine containing 2.50L of an ideal monoatomic gas at 310.15 K, 1.00 atm (Cp,m = 5/2 R) is designed to go through the following cycle: %3D AB; A 2-fold decrease in pressure under constant volume conditions. B>C; Isothermal expansion to increase the volume by 4-fold. C→D; Reversible adiabatic compression to the initial pressure. D→A; Constant pressure compression back to the initial volume. Will the first step occur spontaneously if the temperature of the surroundings is held at -50.0 °C?

Select the correct relation for the isentropic process of ideal gases_________     A.     B.     C.     D.

Draw a schematic diagram of each problem with labels of states of a substance; Assign STATE 1 at the inlet of a high-pressure turbine. The states must be arranged in a chronological order; Plot each cycle in a t-s diagram with thestates consistent to the states assignment in the schematic diagram; Water is the working fluid in a cogeneration cycle that generates electricity and provides heat for campus buildings. Steam at 4 MPa, 400 0C, enters a two-stage turbine with a mass flow rate of 0.80 kg/s, from which a of 0.15kg/s is extracted between the two stages at 0.20MPa to provide for building heating, and the remainder expands through the second stage to the condenser pressure of 0.01 MPa. Condensate returns from the campus buildings and passes through a trap into the condenser, where it is reunited with the main feedwater flow. Saturated liquid leaves the condenser at 0.01MPa. Both turbine and pump have 90% efficiency. Determine, in kW, the ff: (b) rate of heat transfer for building…