HHP 4250 Lecture Notes - Evaporation

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alyssarchuleta

9 Jan 2023

School

APSU

Department

Health and Human Performance

Course

HHP 4250

Professor

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Document Summary

Instructions: read chapter 12- temperature regulation and chapter 23- temperature exercise and the environment (pgs. Answer the following questions: list and discuss the four mechanisms of heat loss. Radiation involves the transfer of heat from the surface of one object to the surface of another with no physical contact being involved. Conduction is the transfer of heat from the body to the molecules of cooler objects in contact with its surface. Convection is a form of heat loss that is transmitted to either air or water molecules in contact with the body. In evaporation heat is transferred from the body to water on the surface of the skin. Evaporation is the most important part during exercise in a hot/dry because the vapor pressure gradient will be high: list and discuss the two categories of heat production in people.

Related Questions

Question 1

_________ is heat exchange brought about by direct contact with a hot surface.

Select one: a. Conduction b. Convection c. Radiation

Question 2

____ is a very good conductor of heat.

Select one: a. Aluminum b. Stainless steel c. Pyrex d. Air

Question 3 Containers used for baking often are made of poor heat conductors.

Select one: True False

Question 4 Heat transfer within foods is influenced by __________.

Select one: a. moisture b. density c. initial temperature d. all of the choices

Question 5 __________ is heat transfer by a fluid.

Select one: a. Conduction b. Convection c. Radiation

Question 6 ___________ is a method of heat transfer that does not require direct contact.

Select one: a. Conduction b. Convection c. Radiation

Question 7

The amount of heat radiated by a hot object increases greatly as the object temperature increases.

Select one: True or False

Question 8

Broiling transfers heat by radiation while grilling does not.

Select one: True or False

Question 9

Microwaves have their greatest impact on ______ molecules.

Select one: a. protein b. carbohydrate c. fat d. water

Question 10

Shape and materials influence how pots and pans transfer heat.

Select one: True or False

Question 11

___________ is an excellent conductor of heat.

Select one: a. Copper b. Aluminum c. Stainless steel d. Ceramic

Question 12

While durable and relatively inexpensive, thin ________ can develop hot spots.

Select one: a. Copper b. Aluminum c. Stainless steel d. Ceramic

Question 13

_________ can be coated with ceramics or polymerized vegetable oil to prevent discoloration.

Select one: a. Copper b. Aluminum c. Stainless steel d. Iron

Question 14 Pans made of ________ are good at transferring heat but may warp or discolor.

Select one: a. Cast iron b. Aluminum c. Stainless steel d. Ceramic

Please answer all questions, thank you!

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An aluminum plate of 25 mm thick (k = 235 W/m·K) is attached on a copper plate with thickness of 10 mm. The copper plate is heated electrically to dissipate a uniform heat flux of 5300 W/m2. The upper surface of the aluminum plate is exposed to convection heat transfer in a condition such that the convection heat transfer coefficient is 67 W/m2·K and the surrounding room temperature is 20°C. Other surfaces of the two attached plates are insulated such that heat only dissipates through the upper surface of the aluminum plate. If the surface of the copper plate that is attached to the aluminum plate has a temperature of 100°C, determine the thermal contact conductance of the aluminum–copper interface.

orchidraccoon98

Which best illustrates the way in which radiation transfers thermal energy?

Radiation heat transfer does not require a medium
Radiation transfers heat from a warmer object to same temperature object
Radiation transfer heat through a matter
Radiation is not possible in vacuum

HHP 4250 Lecture Notes - Evaporation

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