CH217 - Homework

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 Homework Assignment 1: General Chemistry Review (due 2/8/2010)

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  1. Get

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  1. a

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  1. General

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  1. Chemistry

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  1. text

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  1. that

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  1. you

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  1. may

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  1. use

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  1. as

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  1. a

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  1. reference

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  1. for

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  1. the

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  1. semester.

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  1. Complete

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  1. the

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  1. attached

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  1. CH141

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  1. and

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  1. CH142

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  1. exams

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  1. (you

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  1. may

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  1. consult

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  1. each

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  1. other,

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  1. but

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  1. must

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  1. submit

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  1. your

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  1. own

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  1. work).

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  1.   Please

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  1. turn

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  1. in

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  1. a

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  1. hard

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  1. copy

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  1. in

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  1. class.

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  1. Ch142 Final 2000.pdf           CH141 Final Exam 2003.pdf                

Homework Assignment 2: Room Energy Audit (due 2/15/2010)

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Every

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student

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will

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help

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prepare

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a

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Colby

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student

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energy

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audit

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of

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electrical

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appliances

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used

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by

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the

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student

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body.

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  Start

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by

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claiming

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an

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appliance

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by

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adding

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your

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name

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to

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the

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table

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below.

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  You

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may

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fill

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in

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the

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rest

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of

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your

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row

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at

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a

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later

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date.

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Name

Appliance

Energy Consumption (J/year)

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Number on Campus

Total Energy

example

microwave

3.73 * 10^4 kJ/year

1077.1

4.01 * 10^7 kJ

Sarah

Cell chargers

 

 

 

Andy

Laptop chargers

 

 

 

Reuben

Televisions

 

 

 

Erin

Hair Straighteners

 

 

 

Rachael

Lamps

9.58 E7 J/yr

1717

1.65 E8 kJ

Amy

Refrigerators

 

 


Devon

Speakers

6.93 * 10^7 J/year

1235

8.56 * 10^7 kJ

Mike

Electric Razors

1.79 * 10^3 J/year

706

1.26 * 10^5 kJ

Kimberly

clocks

1.36 x 10^8 J/yr

752

2.4 x 10^8 kJ/yr

Greg

Coffee Maker

 


 

Josie

Microwave

 

 

 

Once you have selected the appliance, survey 10 or more rooms to get a statistical sampling of the appliance frequency on campus.  Determine the energy consumed by the appliance over the course of the academic year and compute the total energy consumed by all students using the appliance.  Put your data in the table above and provide the details on your appliance and your calculations below.  This assignment is only submitted on this page.

Post answers to assignment 1 below:  (list name, appliance, and then details)
Steve Jobs, Apple laptop computer

    Details on the calculations for computer energy consumption ....

_______________________________________________________________________________________________

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Example,

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Blow

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Drier

 

Brand

Voltage (V)

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Current

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(A)

...

Power

...

(W)

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1

Jilbere

125

10

1250

2

Physique

125

15

1875

3

Revlon

125

15

1875

4

Conair

125

15

1875

5

Perfection Classic

125

15

1875

6

Vidal Sassoon

125

15

1875

7

Conair

125

15

1875

8

Conair

125

15

1875

9

Conair

125

15

1875

10

Conair

125

15

1875

Average

 

 

 

1812.5

Average Energy Consuption a year assuming 10 minutes daily use.

1812.5 J/sec * 60 sec/min * 10 min/day * 365 day/year = 3.97E8 J

Assuming every female (54.8%) on campus and no males use a blow dryer (some guys have hair driers)

3.97E8 J * 1867 * 54.8% = 4.06E11 J = 4.06E8 kJ

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 Electric Razors

Sample #

Brand

Use (min/week)

Voltage (J/c)

Current (c/sec)

Power (J/sec)

1

Braun

10

12

0.400

4.8

2

Braun

12

12

0.400

4.8

3

No Razor

 

 

 

 

4

No Razor

 

 

 

 

5

No Razor

 

 

 

 

6

Phillips Norelco

7

15

0.420

6.3

7

Phillips Norelco

12

15

0.420

6.3

8

No razor

 

 

 

 

9

No razor

 

 

 

 

10

No razor

 

 

 

 

Average

40% of student body

10.25

 

 

5.6

 Average Energy Consumption:

5.6 J/sec * 60 sec/min * 10.25 min/week * 52 weeks/year = 1.79 * 10^3 J/year

Assuming only males use electric shavers

1.79 * 10^3 J/razor/year * 1764 students * 0.40 razors/student * 1J/1000kJ = 1.26 * 10^5 kJ/year

Devon McIntyre, iPod/Computer Speakers

Sample #

Brand

Voltage (V)

Current (A)

Power (W)

1

Altec Lansing,
InMotion

100 - 240

0.8

80

2

Logitech

120

0.525

63

3

Bose

120

0.16

19.2

4

Bose

120

0.16

19.2

5

JBL

120

0.183

22

6

JBL

120

0.183

22

7

JBL

120

0.183

22

8

Klipsch

100 - 240

max 1.5

150

9

iSymphony

120

0.9

108

10

JBL

120

0.183

22

Average

 

 

 

52.74

Average energy consumption in a year assuming speakers are used 1 hour per day:

52.74 J/sec *  60 sec/1 min  * 60 min/1 day  *  365 days/1 year  = 6.93 E7 J/year

Colby students total – 1838

% Colby students on campus – 96%

Total Colby students on campus – 1764

Assume 70% of students have speakers – 1764  * .70  =  1235 students with speakers on campus

1235* * *  6.93 E7 J  =  8.56 E10 J  =  8.56 E7 kJ/year

_______________________________________________________________________________________________

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Rachael Mack:

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Lamps

 

Brand

Voltage (V)

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Current

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(A)

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Power

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(W)

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1

Walmart

120

0.5

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60

2

 

120

0.33

40

3

Your Zone

120

0.33

(40*5

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bulbs)

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200W

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4

 

120

0.33

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40

5

Jansjo

120

0.09

10.8

6

Jansjo

100

0.09

0.09

7

Walmart

120

0.12

14

8

 

120

0.5

60

9

 

120

0.33

40

10

Walmart

120

0.12

14

Average

 

 

 

48.78

Assuming there is on average one lamp per person, and each person uses it daily for about 1.5 hours. (Approximately 93% of the total student body lives on campus – 1717 students.)

48.78 J/s * 60 s/min * 90 min/day * 365 day/yr = 9.61 E7 J/yr

9.61 E7 J/yr * 1717 students = 1.65 E8 kJ/yr

_______________________________________________________________________________________________

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*Reuben

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Biel,

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Television

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*

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Room

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No

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Brand

Volt (V)

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Current

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(A)

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Wattage

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(W)

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Time (hrs_used/day)

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Occupants

Gender

kJ Used per Room per Day

kJ Used per Individual per Day

1

Sylvania

120

0.44

53

0.57

3

M

109.0285714

36.34285714

2

Emerson

120

0.5

60

1

2

F

216

108

3

---

0

0

0

0

2

M

0

0

4

Orion

120

0.92

110

1

2

F

396

198

5

Olevin

120

1

100

1.5

3

M

540

180

6

---

0

0

0

0

2

F

0

0

7

---

0

0

0

0

3

M

0

0

8

Emerson

120

0.46

55

1

2

F

198

99

9

Magnavox

120

2

240

0.57

1

M

493.7142857

493.7142857

10

Magnavox

120

0.33

40

5

1

M

720

720

11

RCA

120

0.46

55

1.5

1

F

297

297

12

LG

120

1.25

150

6

1

M

3240

3240

13

Insignia

120

0.58

70

0.5

0.5

F

126

---

13A

LG

120

1.25

150

2

0.5

F

1080

---

13 Total

 

0

0

0

0

1

F

0

1206

14

---

0

0

0

0

1

F

0

0

Assuming that Televisions only draw energy while being used (false assumption so is an underestimate of actual usage):
Average Usage per Female per Day (including those without TVs): 273 kJ/day
Average Usage per Male per Day (including those without TVs): 667 kJ/day
If there are approx. 960 females (54.8%) and 790 males on campus (Total 1750 students), then:
Total Female Usage per Year = 273 kJ/female-day*365 days/yr*960 females = 9.55E7kJ/yr
Total Male Usage per Year = 667 kJ/female-day*365 days/yr*790 males = 1.92E8kJ/yr
Total Energy Usage per Year = 9.55E7kJ/yr + 1.92E8kJ/yr = 2.88E8kJ/yr

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Kimberly Bittler, Electric alarm/radio clocks

| Room | Brand | Voltage (V) | Current (A) | Power (W) |

1

0

0

0

0

2

0

0

0

0

3

0

0

0

0

4

Timex

120

0.05

6

5

Memorex

15

1

15

6

Sony

120

0.04

5

6

0

0

0

0

6

0

0

0

0

7

Sony

120

0.04

5

8

RCA

22

1

22

8

iPod

15

1.5

22.5

9

0

0

0

0

9

0

0

0

0

9

0

0

0

0

10

0

0

0

0

11

0

0

0

0

12

Sony

120

0.04

5

13

0

0

0

0

14

Sony

120

0.04

5

15

Memorex

120

0.04

5

16

0

0

0

0

 

Number of students with alarm clocks:

9/21 students in the survey = 43 % x ~1750 students on campus = 752 students

Average power use of alarm clocks: 10.0 W

Total Average power use (including non-owners): 4.3 W

Yearly Average Power Use per student:

4.3 J/sec x 60 sec/min x 60 min/hr x 24 hr/day x 365 day/yr = 1.36 x 10^8 J/yr

Campus Power use:

1.36 x 10^8 J/yr x 1750 students = 2.40 x 10^11 J/yr x 1 kJ/1000 J = 2.40 x 10^8 kJ/yr