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Gelneren [198K]
3 years ago
7

The evaporator section of a refrigeration unit consists of thin-walled, 10-mm-diameter tubes through which refrigerant passes at

a temperature of −18°C. Air is cooled as it fows over the tubes, maintaining a surface convection coeffcient of 100 W/m2 ⋅ K, and is subsequently routed to the refrigerator compartment. (a) For the foregoing conditions and an air temperature of −3°C, what is the rate at which heat is extracted from the air per unit tube length? (b) If the refrigerator’s defrost unit malfunctions, frost will slowly accumulate on the outer tube surface. Assess the effect of frost formation on the cooling capacity of a tube for frost layer thicknesses in the range 0 ≤δ ≤ 4 mm. Frost may be assumed to have a thermal conductivity of 0.4 W/m ⋅ K. (c) The refrigerator is disconnected after the defrost unit malfunctions and a 2-mm-thick layer of frost has formed. If the tubes are in ambient air for which T[infinity] = 20°C and natural convection maintains a convection coeffcient of 2 W/m2 ⋅ K, how long will it take for the frost to melt? The frost may be assumed to have a mass density of 700 kg/m3 and a latent heat of fusion of 334 kJ/kg
Engineering
1 answer:
docker41 [41]3 years ago
6 0
1.01 W/M that’s the answer
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Explanation:

These are probably the most used tool in any Plumber’s tool box. Pliers are not just another tool for a Plumber, they become an extension of their arms. Most people think that sounds odd, but pliers are more than just a tool to grab or turn things.

These are probably the most used tool in any Plumber’s tool box. Pliers are not just another tool for a Plumber, they become an extension of their arms. Most people think that sounds odd, but pliers are more than just a tool to grab or turn things.Sometimes a piece of copper pipe won’t quite go into a fitting. By using the handle end as a mallet you can gently force it in without damaging/denting the pipe or fittings. Or, when a brute force is needed the jaw end becomes a hammer. On an old pair of pliers I took a grinder to form one side of the handle into a flathead screwdriver/pry bar.

7 0
3 years ago
When in regular operation, ash and other debris should be removed _______ from the combustion chamber of a wood-burning heater.
Klio2033 [76]

Answer:

    Daily from the combustion chamber of a wood-burning heater.

<h3>Explanation:</h3>
  • As a wood stove heats up, it radiates heat through the walls and top of the stove
  • This radiant heat warms the immediate area and can be carried into other parts of the home via the home's natural airflow.
  • Electric or convection-powered fans can help circulate this heat to warm a larger area.

To learn more about it, refer

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8 0
2 years ago
Write the Different types of Trainings and explain Anyone in short​
Eddi Din [679]

Answer:

Coaching or mentoring

Coaching or mentoring can share similar qualities to hands-on training, but in this type of employee training, the focus is on the relationship between an employee and a more experienced professional, such as their supervisor, a coach, or a veteran employee.

The one-on-one mentoring style creates a relationship between employees that carries far beyond training. Lecture-style training

Important for getting big chunks of information to a large employee population, lecture-style training can be an invaluable resource for communicating required information quickly.

However, use this type of employee training sparingly.

3 0
3 years ago
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Phantasy [73]

Answer:

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3 0
3 years ago
Read 2 more answers
Silicon is the most widely used semiconductor material for integrated circuits. Which of the following are less common semicondu
Alenkasestr [34]

Answer:

c) gallium arsenide ,d) germanium

Explanation:

Silicon is the mostly used semiconductor material which used in integrated circuits,because it have some unique properties which make it so useful in electronics industries.

Silicon also can use as insulator as well as conductor .It is generally found in earth crust.

Gallium arsenide and germanium are material which have less used in integrated circuit.

5 0
3 years ago
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