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Problem 1:
I will likely end up teaching this class again next semester in the same room. It has been a cool summer, but am a little worried that our classroom will be too hot late in the spring and want to know now, so proper steps can be taken to make sure the room is comfortable. You can help by performing the energy balance of a full classroom. We have 37 people in our class (including the instructor). The building is cooled by air conditioning units that provide 5 kW of cooling capacity. Each person dissipates about 360 kJ/h. There are about 35 light bulbs in the room, each with a rating of about 40 W. The rate of heat transfer through the walls and windows to the room will probably be around 15,500 kJ/h. Determine the total number of air conditioning units needed to maintain the room at 22 oC
Problem 2:
A bird weighing 1.7 kg leaves the ground and flies to a There are about 35 light bulbs in the room, each with a rating of about 40 W. The rate of heat transfer through the walls and windows to the room will probably be around 15,500 kJ/h. Determine the total number of air conditioning units needed to maintain the room at 22 oC height of 70 m, where it attains a velocity of 22 m s-1. What is the change in energy involved in this process.
a city power plant wishes to install a feed-water heater in its steam generation system. it is estimated that the
Ideal Otto and Brayton cycles are operating from sea level atmospheric inlet conditions and a pressure ratio 15:1. Find the thermodynamic efficiencies (nth) for these two cycles. There should be two answers
a 12.7 mm diameter twist drill is used to drill a hole in a low-carbon steel workpiece using a feed of 0.3 mmrev and a
a disk cam rotates at a constant speed of 300 rpm and drives a translating roller follower through a rise of 1.5 inches
A refrigerator in a kitchen at 20 degrees Celsius uses R-134a. The freezer is to be kept at -5 degrees Celsius or cooler. What is the maximum pressure that can be used in the evaporator? Why?
a tube with elastic modulus of 75 gpa is used to support a compressive load. it is required that this tube must not
Name products that are manufactured using these processes and write 2 sentences on why you know it's made from this process. Pick 10/16 processes
A 0.6 m diameter gas pipeline is being used for the long-distance transport of natural gas. Just pas a pumping station, the gas is found to be at a temperature of 25 C and a pressure of 3.0 MPa. The mass flow rate is 125 kg/s, and the gas flow is adi..
a he-xe mixture containing .75 mole fraction of helium is used for cooling of electronics in an avionics application.
An air bubble with a radius of 0.5 cm is released from the regulator of a scuba diver swimming 30 m below the sea surface. Estimate the radius of the bubble just before it reaches the water surface. Assume that the pressure inside the bubble is equal..
a mass suspended by a spring is subjected to a triangular force impulse. at the initiation of the impulse the force is
An automotive radiator cools glycerine from 95 degrees C to 55 degrees C, Air flows through it, entering at 20 degrees C and leaving at 25 degrees C. If the radiator is designed to reject 25kW determine the mass flow rate of the glycerine
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