The figure (Figure 1)shows the cycle for a heat engine that uses a gas having y = 1.25. The initial temperature is T₁- = 300 K, and this engine operates at 16 cycles per second. What is the power output of the engine? Express your answer with the appropriate units. μÅ ? Pout=658 W Submit Previous Answers Request Answer X Incorrect; Try Again; 28 attempts remaining
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- The figure (Figure 1)shows the cycle for a heat engine that uses a gas having γ=1.25. The initial temperature is T1=300K, and this engine operates at 30 cycles per second. What is the power output of the engine? Pout = 1.6 kW What is the engine's thermal efficiency?Converting sunlight to electricity with solar cells has an efficiency of ≈15,. It’s possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish as shown concentrates sunlight on one side of a heat engine, producing a hotreservoir temperature of 650°C. The cold reservoir, ambient air, is approximately 30°C. The actual working efficiency of this device is ≈30,. What is the theoretical maximum efficiency?Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish in (Figure 1) concentrates sunlight on one side of a heat engine, producing a hot-reservoir temperature of 560 ∘C. The cold reservoir, ambient air, is approximately 30 ∘C. The actual working efficiency of this device is 30%. What is the theoretical maximum efficiency?
- A series of thermodynamic processes is shown in the pV-Diagram (see figure on the side). In process ab, 150J of heat are added to the system, and in process bd, 600 J of heat are added. Find a) internal energy change in process ab; b) the internal energy change in process abd; and c) the total heat added in process acd.Many decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. For some industries, a payback period is as small as 2 yeas) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average T for the 120-day heating season to be 15.0 .An ideal gas expands isothermally along AB and does 700 J of work (see below). (a) How much heat does the gas exchange along AB? (b) The gas then expands adiabatically along BC and does 400 J of work. When the gas returns to A along CA, it exhausts 100 J of heat to its surroundings. How much work is done on the gas along this path?
- When a gas expands isothermally, it does work. What is the source of energy needed to do this work?Consider the thermodynamic process, A->B->C->A shown above. The heat absorbed during A->B is 591J. If the change in internal energy during B->C is 4146J, What is the change in internal energy in SI units during C->A? Express only the number of your answer with 4 significant figures.Please answer the following question(s): 1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -28° C and has heat transfer to another environment at 47 ° C? COP ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = kj (c) What is the cost of doing this if the work costs 10.0 cents per 3.6 × 106 J (a kilowatt-hour)? Cost in cents = ✓ (d) How many kJ of heat transfer, Qh occurs into the warm environment? Qh= kj Think about what type of refrigerator might operate between these temperatures. Hint: Use the appropriate formula for a refrigerator which is different from a heat pump.
- A heat engine takes in 2500J and does 1500J of work. a) How much energy is expelled as waste? b) What is the efficiency of the engine?Would you be willing to financially back an inventor who is marketing a device that she claims has 25 kJ of heat transfer at 600o K, has heat transfer to the environment at 300o K, and does 12 kJ of work? Explain your answer.Ue A:0r * Il. pluls ► exam 1.pdf Q1// Define the following First law of thermodynamics, adiabatic process, Boyle's law, Reversibility, and Pressure. Q2// Ten kg of oxygen are heated from 350 to 500 K at constant pressure. Calculate the change of enthalpy, change internal energy, heat transfer and work done. Take Cp-0.909, Cv=0.649 Q3// In a nozzle air at 700°C and twice atmospheric pressure enters with 50 m/s velocity, and leaves at a temperature of 40°C. Determine velocity of air at exit. Take Cp = 1.005 kJ/kg.K for air.