Lab 5 Report
Pratiyush Karki
919355422
1. Electric Water Kettle Data
Temp (C)
Temp vs Energy
100
90
80
70
60
50
40
30
20
10
0
Half-Full
Almost-Full
0
100
200
300
400
500
600
100
90
80
70
60
50
40
30
20
10
0
Half-Full
Almost-Full
0
Time(Sec)
0.05
0.1
Energy( kW-hr)
Time vs Energy
600
500
Time(Sec)
Temp (C)
Temp vs Time
400
300
Half-Full
200
Almost-Full
100
0
0
0.05
0.1
Energy (kW-hr)
0.15
0.2
0.15
0.2
2. Heat Capacity
Energy
total
Mass (g) ΔT(C°)
Half
AlmostFull
Cp(J/g °C)
1024.5
74
0.1
4.74853
1,999.60
78
0.22
5.07794
3. Roast Profile
Time vs Energy
Temp vs Time
0.7
250
0.6
Energy( kW-hr
Temp (°C)
200
150
100
0.5
0.4
0.3
0.2
0.1
50
0
0
0
0
50
100
150
Time(Sec)
200
250
300
50
100
150
Time(sec)
200
250
300
4. Energy Usage
Energy on Mass Basis kw-h/g
0.0025
0.002
kw-h/g
0.0015
0.001
0.0005
0
Kettle (Half-Full)
Hot Air Roaster
French Roast
Equipment
Grinder
Kettle (Full)
5. Questions
(i) As the temperature rises for the water, so does the amount of energy and the amount of time.
The mass of water makes a difference as the more amount of water you have, the longer it takes
to heat up which increases the time and the amount of energy. The heat capacity of water was
valued at around the same point as the established, but the water heat capacity seems
higher. There is around a 20% difference and the heat before might count for the discrepancy.
(ii) The light roast seemed to be watered down, but at the same time seemed a bit less strong. The
dark roast was stronger and bolder than the light roast. Both the coffee makers
had similar results, but there was a bit more flavor in the Mr. Coffee.
(iii) The first crack occurred at 3 minutes. The roast changed color since there was a bit less chaff
in the popcorn maker than the roaster.
(iv) The roaster that used more energy was the Kettle, since I don't count the grinder as a roaster.
Per mass of green beans, the machine that used the most energy is the fresh roaster.