Second laws of thermodynamics

Assignment Help Mechanical Engineering

Reference no: EM13714045

The data listed below are claimed for power cycles operating between hot and cold reservoirs at 1000 K and 400 K, respectively. For each case determine whether such a cycle is in keeping with the first and second laws of thermodynamics.

a) Qh=300 kJ, W(cycle)=160kJ, Qc=140 kJ

b) Qh=300 kJ, W(cycle)=180kJ, Qc=120 kJ

c) Qh=300 kJ, W(cycle)=170kJ, Qc=140 kJ

d) Qh=300 kJ, W(cycle)=200kJ, Qc=100 kJ

Reference no: EM13714045

Questions Cloud

Vessel is divided into two compartments connected a valve : An insulated vessel is divided into two compartments connected by a valve. Initially, one compartment contains steam at 10 bar and 500ºC and the other is evacuated. The vale is opened and the steam is allowed to fill the entire volume, achieving a fi..

Determine the least area of a cross section of an ASTM : Determine the least area of a cross section of an ASTM-a36 steel bar required to support a tensile load of 100,000 lbs. the allowable unit stress is 36,000 psi. (Ans. nearest 100th of an inch squared)

Estimate the velocities the doplet will attain : A spherical water droplet having a diameter of 1.3 mm is allowed to fall from rest in atmospheric air at 1 atm and 20C. Estimate the velocities the doplet will attain after a drop of 30, 60, and 300 m.

Calculate the adiabatic flame temperature : Methane gas (CH4) at 25° C, 1 atm enters an insulated reactor operating at steady state and burns completely with x % of theoretical air entering at 25°C, 1 atm.

Second laws of thermodynamics : The data listed below are claimed for power cycles operating between hot and cold reservoirs at 1000 K and 400 K, respectively. For each case determine whether such a cycle is in keeping with the first and second laws of thermodynamics.

Determine the velocity of an airstream in a wind tunnel : The proposed design for anemometer to determine the velocity of an airstream in a wind tunnel is comprised of a thin metallic strip whose ends are supported by stiff rods serving as electrodes for a passage of current used to heat the strip.

A spherical water droplet having a diameter : A spherical water droplet having a diameter of 1.3 mm is allowed to fall from rest in atmospheric air at 1 atm and 20C. Estimate the velocities the duplet will attain after a drop of 30, 60, and 300 m.

Determine the surface temperature of the heated panel : A room has 1000 ft2 of surface, of which 120 ft2 is to be heated, and the balance has an average surface temperature of 60°F. The air temperature in the room is 68°F. The room is occupied by light clothed adults at rest. Determine the surface tempera..

Associated quantities to be expected on the prototype : The flow around a model of a turbine blade is investigated. The model is five times larger than the prototype. A maximum pressure of 4 psi is measured at the leading edge, a maximum velocity of fps is measured near the top of the blade, and a small d..

User Account

All Pages