Stirling Refrigeration
description
Transcript of Stirling Refrigeration
![Page 1: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/1.jpg)
Stirling Refrigeration
ME 498 - Senior LaboratoryNovember 16, 2004
Nicholas Taylor
![Page 2: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/2.jpg)
Overview
Background and theory of the Stirling Cooler
Experimental Set-up and Procedure
Results
![Page 3: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/3.jpg)
Objectives
Operate Global Cooling Model 100B Stirling Cooler
Use thermodynamic principles to analyze the performance
Calculate COP, Qrejected, Qlifted
![Page 4: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/4.jpg)
Background
Model 100B free piston Stirling Cooler
High conversion between mechanical and thermal energy
AC linear motor drives the piston
Working gas – helium
![Page 5: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/5.jpg)
Background
![Page 6: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/6.jpg)
Theory
Coefficient of Performance
Stirling
LiftedR
W
QCOP
dt
dTmcQ plifted
liftedrejectedstirling QQW
![Page 7: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/7.jpg)
Theory
Finding Qrejected
)( inletoutletprejected TTcmQ
Vm water
![Page 8: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/8.jpg)
Experimental Apparatus
Water ToSink
Water FromSink
DigitalPowerMeter
Wire Box
Variac Auto-Transformer
Variac Auto-Transformer
Fluke 77DMM
Fluke 87DMM
OmegaTemperature
Controller Omega TemperatureMeasurement Device
Model 100BStirlingCooler
Flowmeter
Thermocouple
ThermofoilHeater
![Page 9: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/9.jpg)
Procedure
Measure flow rate Prepare data acquisition system Increase voltage to the stirling cooler, to
begin cooling Record data until the temperature
reaches -30°C, activate the heater and reach equilibrium at -20°C
Turn off equipment
![Page 10: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/10.jpg)
Results
Temperature vs. Time
COPR for 5°C, 0°C, -10°C, and -23°C
Compare COP found to COP from Global Cooling
COPR, Wstirling, and Qrejected at equilibrium
Compare COP at equilibrium with COPcarnot
Uncertainty Analysis
![Page 11: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/11.jpg)
Results
Temperature vs. Time
-40.00
-30.00
-20.00
-10.00
0.00
10.00
20.00
30.00
0 200 400 600 800 1000 1200 1400 1600 1800
Time (sec)
Tem
per
atu
re (
C)
![Page 12: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/12.jpg)
Results
Temperature vs Time(during cooling)
y = 281.45e-0.0003x
0.00
100.00
200.00
300.00
400.00
0 100 200 300 400 500 600 700 800
Time (sec)
Tem
per
atu
re (
K)
![Page 13: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/13.jpg)
Results
Global Cooling
Temp Time Cp m dT/dt Qlifted Wstirling COP Input COP % diff.
(deg C) (sec) (J/kJ*C) kg (W) (W) (W)
5 79 380.23 0.27 -0.087 8.88 9.22 0.963 6 2.33 58.66
0 118 379 0.27 -0.088 8.954 9.2 0.973 5 2.06 52.75
-10 219 376.42 0.27 -0.090 9.167 9.11 1.006 3 1.06 5.07
-23 419 372.8 0.27 -0.096 9.633 9.68 0.995 4 1.18 15.67
![Page 14: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/14.jpg)
Results
Equilibrium Test
Qreject 32.318
Qlifted 12.204
Wstirling 20.114
COP 0.607
COP carn. 2.809
% difference 78.398
![Page 15: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/15.jpg)
Uncertainty
Uncertainty of COP
Uncertainty of Qlifted
Uncertainty of Qrejected
Uncertainty of Vdot
![Page 16: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/16.jpg)
Uncertainty
% ωCOP = 1.2%
ωQrejected = 4.61 (32.318)
ωVdot = 2.85E-8
ωQlifted = 0.11 (12.204)
ωCOP = 6.18E-3 (.607)
![Page 17: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/17.jpg)
Uncertainty
Qlifted
Component Value Uncertainty
V 10.8 0.01
I 1.13 0.01
Component Qlifted n (n+dn) Qlifted(n+dn) dQlifted/dn
V 12.204 10.8 10.8 12.204 1.13
I 12.204 1.13 1.13 12.204 10.80
ωQlifted 0.11
![Page 18: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/18.jpg)
Conclusions
Learned a practical use of a Stirling Cooler
Found COP, Qrejected, and Qlifted
Found the uncertainty in measurements
Recommend comparing to a traditional refrigeration cycle
![Page 19: Stirling Refrigeration](https://reader036.fdocuments.in/reader036/viewer/2022082517/568139bb550346895da15d28/html5/thumbnails/19.jpg)
References
http://www.globalcooling.com
http://132.235.18.152/seniorlab