Chapter 8, Problem 8.4CU

10.) An ideal gas with goes thru the quasistatic cycle shown to the right. The Pabs(atm) steps are: A. Isothermal expansion from state 1 to state 2. B. Constant pressure compression from 2 to 3. C. Constant volume increase in pressure from 3 7.00 back to 1. a) Find the net change in internal energy of the gas for the complete cycle. b) Find the net heat exchanged by the gas with its surroundings. Is this heat into or out of the gas? c) Find the net work done by the gas for the complete cycle. Hint: Remember Q = nCvAT(const. volume) & Q = nCpAT(const. Pressure) 3.11 3: В V(L) 4.00 9.00

Octane is used as the working fluid in a gas-flow refrigeration cycle. The pressure ratio of the system is 5 and the octane enters the compressor at -15 oC. Fluid temperature at turbine inlet It is 70 oC. By accepting the adiabatic efficiency of the compressor and turbine as 80%; a) the flow diagram of the cycle, T-s diagram of the cycle, b) turbine inlet temperature, c) the efficiency coefficient of the cycle, d) find the highest and lowest temperatures of the cycle and e) find the required amount of fluid for 10 kW cooling load.

Steam power plant shown in figure isoperating at steady state with water as the workingfluid. The mass flow rate of the water circulatingthrough the components is 50 kg/s. Determine:a) thermal efficiency of the actual cycleb) Carnot cycle efficiency (justify anyassumptions you make in calculating ηCarnot)c) isentropic turbine efficiencyd) isentropic pump efficiencye) mass flow rate of the cooling water, in kg/s.f) rates of entropy production, each in kW/K, forthe turbine and steam generator

2) Find the heat supplied, in kJ per kg of air circulation.  3) Find the percent thermal efficiency of the cycle, neglecting the mass of fuel.

A reversible cycle receives 40 kJ of heat from one heat source at a temperature of 127 ℃ and 37 kJ from another heat source at 97 ℃. The heat rejected (in kJ) to the heat sink at 47 ℃ is. A. 36 B. 49 C. 64 D. 81

Solve the required please I need the answers as soon as possible

The cost of electricity to operate a compressor for one year can exceed the purchase price of the compressor.

2. A reversed cycle has refrigerating C.O.P. of 4, (i) Determine the ratio T,/T, ; and (ii) If this cycle is used as heat pump, determine the C.O.P. and heat delivered. [Ans. (i) 1.25 (ii) 50 kW, 5]

In a Rankine cycle ,saturated liquid water at 0.80 bar is compressed isentropically to 170 bar . First by heating in a boiler ,and then by superheating at constant pressure of 150 bar ,the water substance is brought to 700 K . After adiabatic reversible expansion in a turbine to 0.80 bar ,it is then cooled in a condenser to saturated liquid . Find the following : A.) Quality after turbine expansion  B.) Turbine work  C.) Heat added in the boiler  D.) Heat rejected from the condenser  E.) Pump work  F.) Net work  G.) Cycle efficiency