An evaporator test stand has been designed, sized, constructed, calibrated and operated to investigate the evaporator performance degradation for low temperature refrigeration applications. Measurements have been taken of air- and refrigerant-side temperatures, refrigerant-side pressures, air- and refrigerant-side differential pressures, air- and…
Contents
1 Introduction1
2 Literature Review4
3 Objectives
4 Test Facility
4.1 Test Heat Exchanger
4.2 Test Conditions
4.3 Wind Tunnel Layout / Design
4.3.1 Wind Tunnel Fan
4.3.2 Condensing Unit – Compressor Sizing
4.4 Instrumentation
4.4.1 Pressure Transducers
4.4.2 Differential Pressure Transducers
4.4.3 Thermocouples
4.4.4 Relative Humidity and Temperature Sensor
4.4.5 Mass Flow Meter
4.4.6 Power Consumption Measurement
4.5 Nozzle
4.5.1 Nozzle Calibration
4.6 Defrost Control
4.7 Data Acquisition System
4.8 Test Procedure
4.8.1 Pretest Procedure
4.8.2 Test Procedure
4.8.2.1 Startup
4.8.2.2 Cycling
4.8.2.3 Shut down
5 Data Analysis 40
5.1 Refrigeran-Side Performance
5.2 Air-Side Performance
5.3 Energy Balance
5.4 Uncertainty Analysis
6 Test Results
6.1 Fin-and-Tube Type Heat Exchanger – 210 cfm
6.2 Fin and Tube Type Heat Exchanger – 240 cfm
6.3 Comparison and Discussion
7 Conclusion
8 Future Work
9 Appendix
10 References
Author: Muehlbauer, Jan
Source: University of Maryland
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