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FLORIDA STATE UNIVERSITY / FAMU-FSU
COLLEGE OF ENGINEERING
DATA/RESULTS
The following graphs show exhaust temperatures
(entering the heat exchanger). When the slope is positive the heater is on and
when it is negative the heater is off. The dryer takes a certain amount of time
to reach the steady-state temperature then the heater intermittently turns off
and on to maintain a temperature of between 60 and 70 deg C. Looking at the two
graphs an apparent trend can be seen where the dryer reaches the desired
temperature quicker and thus can spend less time on and use less electricity.
·
Average Power Usage per Cycle
o
Stock
§ Heater: 4.07 kW-hr
§ Total: 5.41 kW-hr
o
With Heat Exchanger
§ Heater: 3.26 kW-hr
§ Total: 4.60 kW-hr
·
Percent Reduction of Energy Usage
o
Heater: 19.9%
o
Total: 14.9%
·
Savings (based on $0.13 per kW-hr)
o
Per Load: 10.53 cents
o
Per Year: $31.59 (avg. 300 loads/year)
o
Dryer Lifetime: $315.90 (10 years)
·
Emissions Reduction
o
More than 200 kg reduction in CO2 emitted per dryer per year.
o
If every dryer in
FAMU-FSU