A refrigerator with a coefficient of performance of 4 transfers heat from a cold region at –20°C to a hot region at 30°C. Calculate the total entropy change of the regions when 1 kJ of heat is transferred from the cold region. Is the second law satisfied? Will this refrigerator still satisfy the second law if its coefficient of performance is 6?

Q: (d) A heat engine operates by taking heat from a thermal reservoir at 1000°C and rejecting heat to a…

A: Given Data: The temperature of the thermal reservoir source is TH = 1000°C The temperature of the…

Q: How did Clausius modify Carnot’s original analysis of the ideal heat engine?

A:

Q: Two identical metal blocks, each weighing 25 kg and having a specific heat of 0.4 kJ/kg, are first…

A: Let us consider that the final temperature of the higher temperature block as T_1, and lower…

Q: Imagine you are asked to design a thermal engine that is to operate between thermal reservoirs at 10…

A:

Q: steady flow thermodynamic system receives 100 lb/min of a fluid at 30 psia and 200°F and discharges…

A:

Q: A power plant is operating with a heat-source reservoir at 350°C and a heat-sink reservoir at 30°C.…

A: Given data: The initial temperature of the heat source, TH = 350°C. The temperature of the sink…

Q: Show that no real heat engine operating between two reservoirs of temperature T h and T c could ever…

A: No real heat engine operating between two reservoirs could ever be more efficient than a Carnot…

Q: In large steam power plants, the feedwater is often heated in closed feedwater heaters, which are…

A: Given, P1 = 1.6 MPa T1 = 250°C P2 =P1 = 1.6 MPa T3 = 30°C P3 = 4 MPa P4 = P3 = 4 MPa T4 = T2- 10°C…

Q: A cylindrical container, 6m in radius and 3m long, with a lid holds 1.657 x 107 moles of water at 30…

A: Givenr=6mL=3mn=1.657×107 molesT1=30oCW=3000 kWT2=50oCQ=50 kW/m2ρ=1 g/cm3Cp=4.18 kJ/kgoC

Q: An inventor claims that a new fridge can operate between -15 degree Celsius and 150 degree C while…

A: Given:T2=-15°C =258 KT1=150°C =423 KHeat taken from sink,Q2=2200 WWork input,W=2000 W

Q: A rigid tank contains air at 50°C that is being stirred by a paddle wheel. The paddle wheel does 350…

A:

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.