2 thermo problems which I need answered in full
1. Air in a piston/cylinder expands reversibly and adiabatic. The initial temp is 507K and the pressure in 600Kpa. The final pressure is 120Kpa. Find a) mass of the air in kg b) final temp assuming constant specific heat. c) find work 2. Heat Pump problem. 30,000 kj/h to maintain a building at 20 degrees C with ou ...continues
Determining the exit temperature and power input of air through a compressor.
Air at 150Pa and 310K enters a compressor of inlet diameter 2cm. The Compressor raises the pressure to 3.5 times the inlet pressure and has an outlet diameter of 5cm. Determine the exit temperature and power input required, if the mass flow rate of air is 100kg/hr
Determining the boundary work and final temperature in a piston cylinder.
One tenth kilogram of Argon is contained in a piston-cylinder assembly. Initially at 4900 K and a volume of 40 liters, the gas undergoes an isobaric process during which the heat input is 30 kJ. Determine the boundary work and final temperature.
Calculating efficiency and power in a carnot engine.
A Carnot engine is used in a nuclear power plant. It receives 1500 MW by heat transfer with a source at 340C, and it rejects thermal waste to a nearby river at 27C. The river temperature rises by 3C. Determine the: (i) Efficiency of the power plant (ii) Power output of the power plant
Consider a Rankine cycle with reheat. Compressed water enters the boiler at 21 bars and is heated to 500C. Due to frictional effects there is a pressure loss of 1 bar in the boiler. At the exit of the boiler 40% of the steam produced is extracted for an external chemical process. The exhaust pressure of the first turbine is ...continues
Calculating thermal efficiency and mean effective pressure from the Rhino Cycle.
The Rhino Cycle is the basis for the engine which powers the Rhino Car. The cycle consists of: 1-2: Isentropic compression from 1.0 bar and 300K to 10 bars 1-3: Constant pressure heat addition of 850 KJ/KG 3-4: Isothermal expansion to 9 bars 4-5: Isentropic expansion to 1.0 bar 5-1: Constant pressure cooling Determine ...continues
Calculating temperature, water evaporation, and heat in a power plant cooling situation.
In a nuclear power plant the cooling tower system must be run on a closed cycle. That is, the air exiting the tower passes over cooling coils to return it to its initial condition prior to reentering the tower. Air at 20C and 40% relative humidity enters the tower at a rate of 1.3 x 106 kg/sec. Water enters the tower ...continues
In a chemical plant one of the products produced is carbon monoxide, CO. It is proposed to utilize this CO by reacting it with water to form hydrogen gas. The "unbalanced" chemical equation is CO + H2O CO2 + H2 If the CO and H2O come into the reaction chamber at 0.1 MPa and 400 K, what is the required heating fo ...continues
Thermodynamics Brayton cycle and gas turbine problem.
A large stationary Brayton cycle gas-turbine power plant delivers a power output of 100MW to an electric generator. The minimum temperature in the cycle is 300K, and the maximum temperature is 1600K. The minimum pressure in the cycle is 100 kPa, and the compressor pressure ratio is 14 to 1. The compressor has an isentropic effic ...continues
A diesel engine has air before compression at 280 K and 85 Kpa. The highest temperature is 2219 K and the highest pressure is 6 MPa. Find the volumetric compression ratio and the mean effective pressure using cold air properties at 300K.
