Chapter 8, Problem 8.7P

Consider a heat transfer process of the steady form that occurs along a plain wall. While the inner room temperature was kept at 25 °C, the outdoor environment temperature was measured to be 2 °C. If the heat transfer at this plain wall in an hour is 3,528 kJ, determine the.total exergy destruction per unit time (the rate), which occurs during this heat transfer process, a) use the total entropy generation to find the rate of the total exergy destruction in the room (i.e.., use the entropy balance), b) use the exergy balance to find the rate of the total exergy destruction in the room

To decrease the entropy temporarily, the system needs: Heat Work Matter Vacuum Cannot be determined

Provide the solution and diagram. A 120 tons refrigeration system with COP of 5 has a condenser which is to be cooled by means of a cooling tower.  Air enters the tower at 25 oC db and 50% RH and leaves at 35 oC db and 80% RH. Find the volume of air needed m3/hr.    At 25oC and 50% RH:  h = 50 KJ/kg, v = 0.86 m3/kg   At 350C db and 80% RH:  h = 108         A. 7.51 m3/s    B.  2.34 m3/s      C.  4.98 m3/s      D.  3.16 m3/s

How reversible process differs from irreversible process?

Air is heated at constant pressure from 2 7 degrees C to 57 degrees C at 3 bar in a heater from an infinite heat source at temperature 227 degrees C Find the gain in availability of air and the effectiveness of the heater. Assume To = 280K and Cp =1.0 kj/kgK.

A working fluid at 500 kPa, 400°C is in a piston-cylinder equipment with an initial volume of 0.9 m3. The fluid undergoes an expansion process which may be described as PV = constant. The final pressure is 200 kPa. Calculate the work for this process in kJ.

the Clausius an and a and a positive reservoir and produce a net statement, and vice versa negative statement amount of work. statement can be proved. from a single reservoir and produce a net amount of work. plant to operate, the working fluid must exchange heat with the environment as well as the furnace. the transfer of heat from a higer- temperature body to a lower- temperature body. effect other than the transfer of heat from a lower- temperature body to a higher- temperature body. cannot be proved. QUESTION 26 In an experiment, a rigid container holds 3 kg of refrigerant-134a initially at 30°C and 180 kPa. The refrigerant is now cooled while being stirred until its pressure drops to 80 kPa. At the initial state, the specific entropy is (to 4 d.p.) in (insert unit symbol), specific volume is (to 5 d.p.) in (insert unit symbol), At the final state, the specific volume is (to 5 d.p.)(insert space then init symbol), the quality is (to 3 d.p.), the specific entropy is (to 3…

4 An air nozzle has an efficiency of .90 and is adiabatic. air enters at p1=200 kPa, T1=1300 K with negligible velocity. air exits at p2=130 kPa. use dead state variables of T0=293 k and P0= 100 kPa and a variable heat capacity. what is t2 and the rate of exergy destruction?

.The thermal efficiency of a heat engine is 30%, the heat rejected from the engine is 30kJ, evaluate the heat input to the engine.