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- On a cold winter day, you turn up the thermostat in your house. Assume that your house is well sealed and that no air enters or leaves the house. When the air temperature in your house rises a short while later, what statement is correct regarding the air pressure? Question 10 options: The air pressure does not change at the higher temperature. The air pressure increases at first but then decreases again as the temperature approaches its higher value. The air pressure is lower at the higher temperature. The air pressure decreases at first but then increases again as the temperature approaches its lower value. The air pressure is higher at the higher temperature.Describe how the principles in the “First Law of Thermodynamics” applies to a solar dish-engine systemQuestion 11 You are designing a gas turbine engine that must provide 1.91 kW of output power. The efficiency of the engine is 0.57 times the efficiency of an ideal (Carnot) engine with the same high and low temperatures. You have determined that you can supply 8.77 kW of input heat to the engine at a temperature of 595 K. What is the exhaust temperature you should design for the engine? Give your answer in Kelvin to at least three significant digits. Question 12 A small power plant is designed to generate (output) 8.32 kW of power (8.32x10³ J/s). The plant is powered by steam at 749 K with the exhaust at 325 K. This power plant is less efficient than an ideal engine, of course. It's efficiency is 51.1% of the efficiency of an ideal (Carnot) engine with the same high and lower temperatures. What is the magnitude of the heat that is exhausted by the engine each second? Give your answer in kJ (10³ J) to at least three significant figures. Your answer is a positive number, the magnitude of…
- What are mullion heaters?Which measure does not necessarily increase the boiler efficiency? Please choice one below : Increasing combustion efficiency Decreasing temperature of the exhaust gases Minimizing heat losses Increasing air-fuel ratio None of theseIdentify the amount of enthalpy needed in order to turn steam into 450g h20 (water) that is located at a temperature of 85 degrees Fahrenheit ANS: _____ British Thermal Unit
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- A domestic refrigerator sits in a kitchen, switched on, with the refrigerator door wide open. The kitchen itself is well insulated and it can be assumed no heat can escape or enter the kitchen from the outside. Which of the following is the most accurate statement. а. The temperature in the kitchen will stay the same. O b. The temperature in the kitchen could go up or down depending on the mechanical efficiency of the compressor. O c. The temperature in the kitchen will go down very slightly. d. The temperature in the kitchen could go up or down, depending on the Coefficient of Performance (COP) of the refrigerator. е. The temperature in the kitchen will go up very slightly.Pick the right combination of True Statements. 1. As the by-pass factor (BPF) of the cooling coil increases, temperature difference between air at the outlet of the coil and coil ADP decreases. 2. As the by-pass factor (BPF) of the cooling coil increases, temperature difference between air at the outlet of the coil and coil ADP increases. 3. During cooling and humidification process, the enthalpy of air may increase, decrease or remain constant depending upon the temperature of the wet surface. 4. During sensible cooling of air, dry bulb temperature decreases but wet bulb temperature remains constant 5. The sensible heat factor for a sensible heating process is 1.0Question 1 A nuclear power plant is rated at 500 MW (it provides this amount of useful power). During operation, the hot core is at 577 °C , and the average temperature of the cooling water is 27 °C Part A What is the maximum available thermal efficiency for these temperatures? Part B This plant is rated at the lower efficiency of 50%. For cooling, it takes in seawater at 17 C and gives it back at 37 °C (so that the average is indeed 27 °C). How many kilograms of water is needed per second?