Question: Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel

Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20°C throughout the year, while the walls of the room are nominally at 27°C and l4°C in the summer and winter, respectively. The exposed surface of a person in the room may be assumed to be at a temperature of 32°C throughout the year and to have an emissivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m². K.

Step by Step Solution

★★★★★

3.48 Rating (165 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

KNOWN Air and wall temperatures of a room Surface temperature convection coefficient and emissivity ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

8-P-T-H-M-T (24).docx

120 KBs Word File

Students Have Also Explored These Related Mechanical Engineering Questions!

A wet towel hangs on a clothes line under conditions for which one surface receives solar irradiation of GS = 900 W/m 2 and both surfaces are exposed to atmospheric (sky) and ground radiation of G...

Consider weather conditions for which the prevailing wind blows past the penthouse tower on a tall building. The tower length in the wind direction is 10m and there are 10 window panels. (a)...

Consider the information that is maintained by a bank. In addition to customer records, the bank maintains records on accounts and loans. Figure 1-20 and Figure 1-21 (below) are two examples of...

1 . 2 4 Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer....

#6 and #7 1. Moist air at standard conditions is at a dry bulb temperature of 50F and a relative humidity of 70%. It is sensibly heated (constant moisture) to 72F. Use the psychrometric chart to...

Heating and Cooling Calculations Use the data for the attached sample structure and calculate the following: a) Heat loss for winter conditions b) Heat gain for summer conditions c) Select the...

a. Example 13-1: Batch Reactor with an Exothermic Reaction Wolfram 1. Adiabatic Case: Use Wolfram to see whether you can find a trajectory that is ready to ignite and whose trajectory looks like a...

ANSWER ALL QUESTIONS. WILL GIVE A GOOD RATING FOR A CORRECT ANSWERS ONLY 2-35E A spring whose spring constant is 200 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu,...

please help me answring this question thanks in Advance CASE STUDY ON SUSTAINABLE ISSUES FOR FACILITY PLANNING Please read the article titled "GREEN DESIGN AND SUSTAINABILITY IN SPORT AND RECREATION...

Regional Supermarket is open 360 days per year. Daily use of cash register tape averages 10 rolls. Usage appears normally distributed with a standard deviation of 2 rolls per day. The cost of...

Given a multi tenant office and retail property with gross potential rent revenue of $4,500,000, gross income before credit losses of $4,600,000, credit losses of 3%, and operating expenses of...

The IL Department of Revenue confirmed that the customer's exemption certificate remains valid, and the address change does not make it vodied. The agent recommended updating the address when they...

Solve the given differential equation by undetermined coefficients. y'' + y = 2x sinx

Calculate the angular acceleration of the plate in the position shown, where control link AO has a constant angular velocity w OA = 4 rad/sec and = 60 for both links. D B. --- 12"- 5" C 10" WOA

In order to reduce the steady-state error of the parabolic trough collector system, a PI controller is added to the open-loop transfer function so that (Camacho, 2012) a. Draw the new resulting...

The UR Nuts Company sells Deluxe and Premium nut mixes, both of which contain only cashews, Brazil nuts, almonds, and peanuts. The Premium nuts are much more expensive than the Deluxe nuts. A...

Determine the mass moment of inertia of the homogeneous solid of revolution of the previous problem about the y- and z-axes.

To deposit exactly one mole of Ag from an aqueous solution containing Ag+ requires a quantity of electricity known as one faraday (F). The electrodeposition requires that each Ag+ ion gain one...

Consider the cylindrical bales of hay in Problem 3.82. It is proposed to utilize the microbial energy generation associated with wet hay to heat water. Consider a 30-mm diameter, thin-walled tube...

A spherical Pyrex glass shell has inside and outside diameters of D 1 = 0.1 m and D 2 = 0.2 m, respectively. The inner surface is at T s ,1 = 100C while the outer surface is at T s,2 = 45C. (a)...

A heat exchanger has inlet and outlet temperatures of 90 and $45^{\circ} \mathrm{C}$ for the hot fluid and 15 and $42^{\circ} \mathrm{C}$ for the cold fluid. Can you tell whether this exchanger...

A shell-and-tube heat exchanger (1 shell pass, 2 tube passes) is to be used to condense $3.0 \mathrm{~kg} / \mathrm{s}$ of saturated steam at $330 \mathrm{~K}$. Condensation occurs on the outer...

A shell-and-tube heat exchanger with one shell and two tube passes is designed to heat liquid water flowing at $3.0 \mathrm{~kg} / \mathrm{s}$ from 25 to $65^{\circ} \mathrm{C}$ using hot air....

Go to Web site link : http://phx.corporate-ir.net/phoenix.zhtml?c=72735&p=proxy2 and follow the steps below to provide an analysis of a real US Corporation, Fifth Third Bancorp. For the last two...