Remake of Methods of Heat Transfer by Brendan Maher

3.

2019-06-06 23:21:33 UTC

Radiation is the transfer of heat through electromagnetic waves.
What happens when radiation is incident upon a surface? - One of three things will happen. 1 The surface will absorb the radiation. 2 The radiation will get transferred into other mediums. 3 The surface will reflect the radiation.

2. how can heat transfer due to radiation be stopped from entering a house? Explain as many methods as possible as

2019-06-06 23:22:07 UTC

=3=

2019-06-06 23:22:43 UTC

How is heat transferred via radiation? - through electromagnetic waves. it also does not require a medium or an exchange in mass.
What happens when radiation is incident upon a surface? - One of three things will happen. 1 The surface will absorb the radiation. 2 The radiation will get transferred into other mediums. 3 The surface will reflect the radiation.

3.)

2019-06-06 23:23:11 UTC

PP

2019-06-06 23:23:30 UTC

1. Explain the process of convection. Give at least three real life example. How can heat transfer via convection be stopped? Give some examples of how convection is stopped in house design

2019-06-06 23:24:23 UTC

1. explain the process of convection. give at least three real-life example. how can heat transfer via convection be stopped? give some examples of how convection is stopped in house design.

2019-06-06 23:24:29 UTC

examples: air conditioning
boiling pot

in fluids the hotter fluid rises because it is less dense than the colder fluids.

3. How is heat transferred via radiation. Explain what happens when radiation is incident upon a surface

2019-06-06 23:24:42 UTC

2

2019-06-06 23:24:45 UTC

2)

2019-06-06 23:24:45 UTC

Reflective surfaces absorb less heat radiation and create less heat radiation. If reflective surfaces are placed within walls and ceilings then heat radiation leakage into the house will be drastically reduced.

2. How can heat transfer due to radiation be stopped from entering a house? Explain as many methods as possible.

2019-06-06 23:25:19 UTC

Heat energy also leaves the house by radiation - through the walls, roof and windows.

1.

2019-06-06 23:25:46 UTC

Convection is the circular motion the occurs when a warmer gas or liquid rises and cooler gases or liquid fall.

3

2019-06-06 23:25:47 UTC

When heat is said to be transferred through radiation, it is implied that the energy, in the form of vibrating particles, travels via electromagnetic waves. All states of matter can emit radiation energy whether solid or fluid (liquid, gas) due to their vibrational movement of their atoms. unlike convection and conduction, radiation heat transfer does not require a material medium to travel through. however the medium required for radiation to travel through electromagnetic is vacuum or fluid (liquid or gas). Surfaces receive incident energy and emit radiant energy.

1.

2019-06-06 23:27:28 UTC

If double glazing has a vacuum there will be no convection. False

3

2019-06-06 23:29:17 UTC

2019-06-06 23:29:19 UTC

2019-06-06 23:30:10 UTC

/2/

2019-06-06 23:30:56 UTC

3. With radiation, electromagnetic waves carry the energy. Electromagnetic radiation comes from accelerating electric charges. On a molecular level, that’s what happens as objects warm up — their molecules vibrate harder, causing acceleration of electric charges.

2019-06-06 23:31:30 UTC

2019-06-06 23:31:54 UTC

2019-06-06 23:31:59 UTC

woodlt1 — 2019-06-06 23:33:31 UTC

1. Explain the process of convection. Give at least three real-life examples. How can heat transfer via convection be stopped? Give some examples of how convection is stopped in house design.

Convection is the transfer of heat by movement of particles in a heated liquid or gas.

Examples:

Boiling water - The heat passes from the burner into the pot, heating the water at the bottom. Then, this hot water rises and cooler water moves down to replace it, causing a circular motion.
Hot air balloon - A heater inside the balloon heats the air and so the air moves upward. This causes the balloon to rise because the hot air gets trapped inside. When the pilot want to descend, he releases some of the hot air and cool air takes it place, causing the balloon to lower.
Frozen material thawing - Frozen food thaws more quickly under cold running water that if it is placed in water. The action of the running water transfers heat into the food faster.

Heat transfer via convection can be stopped through the introduction of a material that is considered a bad conductor of heat and therefore an insulator to slow down and ultimately stop the transfer of heat through a liquid's particles.

Examples:

Through insulation in the walls of the house to stop the transfer of heat through air particles.
Air leaks around windows can produce convection transfer of heat and therefore must be sealed to avoid this.

Question 2

2019-06-06 23:35:33 UTC

How can heat transfer due to radiation be stopped from entering a house? Explain as many methods as possible.

Choose an optimum density for porous insulations like fibres and foams which both control convection heat transfer but are so dense as to increase radiation heat transfer.

Solar radiation on windows can be reduced by reducing window area, projecting horizontal shading, and solar control coatings on windows.

2019-06-06 23:37:26 UTC

2019-06-06 23:37:51 UTC

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