Chapter 5, Problem 5.36P

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An art school specializes in metal sculptures and to save money and space they don't have a metal workshop with traditional power tools and cutting torches. To make the sculptures the students gather scrap metal and use a specialized steamer that heats the already thin metal enough to easily bend and can be used inside around other flammable materials as it is steam powered. The steamer creates the steam and then heats it through a funnel from 100 to 450 °C. Use steam tables to find what the heat input in Watts (W) of the funnel is if a continuous stream of steam at a rate of 50 kg/s undergoes the heating process at a constant pressure. Assumption: We are assuming that the P(bar) of saturation is at 0.1 for our steam tables

A heat engine operates between 1625 C and 27 Cand receives 400 kJ of heat. The maximum efficiency of the heat engine is The maximum work produced in kJ is

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A household refrigerator is maintained at a temperature of 2 degrees C. Every time the door is opened, warm material is placed inside introducing an average of 420 kJ, but making only a small.change in the temperature of the refrigerator. The door is opened 20 times a day and the refrigerator operates at -15% of the Ideal COP. The cost of the work is 4 rupees per kWh. What is the monthly bill for this refrigerator? The atmosphere is at 30 degrees C

A system is proposed to generate power from wastewater of 54C. If the ambient temperature is 23C, what is the highest thermal efficiency of this system in %?

A heat pump with a motor of 2 kW is used to keep a chicken hatchery at 30°C. This latter loses energy at a rate of 0.5 kW per degree difference to the colder ambient. The heat pump has a COP that is 50% of a Carnot heat pump. a- Draw a sketch for the entire system showing all energy transfers. b- Illustrate a heat pump operating between two constant-temperature energy reservoirs showing all energy transfers. c- What is the minimum ambient temperature for which the heat pump is sufficient?

On a cold day, a homeowner uses a heat pump to absorb heat from the outside air at 15oF and transfers it into his home at a temperature of 29.4oC. What is the COP of his heat pump?