Laboratory Evaluation of the OASys Indirect/Direct Evaporative

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Prepared by: Reviewed and Approved by: Robert A. Davis Emanuel G. D’Albora Senior Mechanical Engineer Supervising Mechanical Engineer 491-06.12.doc ii
CONTENTS EXECUTIVE SUMMARY .......................................................................................................................... v INTRODUCTION ........................................................................................................................................ 1 Background............................................................................................................................................... 1 Prior Research........................................................................................................................................... 1 Objectives ................................................................................................................................................. 1 System Description ................................................................................................................................... 2 EXPERIMENTAL DESIGN AND PROCEDURE...................................................................................... 2 Process Description and Performance Characteristics.............................................................................. 2 Direct Evaporative Cooling Process ..................................................................................................... 3 Indirect Evaporative Cooling Process................................................................................................... 4 Definition of Cooling Capacity............................................................................................................. 5 Test Facility .............................................................................................................................................. 7 Measurements and Instrumentation .......................................................................................................... 8 Data Acquisition System........................................................................................................................... 9 Test Conditions ......................................................................................................................................... 9 Test Procedure ........................................................................................................................................ 11 RESULTS ................................................................................................................................................... 12 Fixed Inlet Conditions, Variable Outlet Resistance (and Voltage)......................................................... 14 Fixed Outlet Resistance, Variable Intake Conditions .............................................................................16 CONCLUSIONS......................................................................................................................................... 20 Recommendations for Follow-on Activities ........................................................................................... 21 REFERENCES ........................................................................................................................................... 22 APPENDIX...............................................................................................................................................A-1 LIST OF TABLES Table 1: Average Unit Performance ............................................................................................................ v Table 2: ASHRAE Design Conditions for Cities in PG&E Service Territory........................................... 10 Table 3: Test Point Matrix ......................................................................................................................... 11 Table 4: Performance Measures at Medium Fan Speed and 0.3” of Water Supply Pressure .................... 18 Table 5: Averaged Results for Airflow and Power.................................................................................... 19 Table 6: OASys Test Data.....................................................................................................................A-7 491-06.12.doc iii
Page 1: Pacific Gas and Electric Company PY
Page 5 and 6: EXECUTIVE SUMMARY Testing was condu
Page 7 and 8: INTRODUCTION Background The increas
Page 9 and 10: humidity), and reach what is called
Page 11 and 12: evaporative cooler and heat exchang
Page 13 and 14: An alternative measure of capacity
Page 15 and 16: 13. Make-up water flow rate, using
Page 17 and 18: Table 3: Test Point Matrix (Highlig
Page 19 and 20: °F 120 110 100 90 80 70 60 50 40 D
Page 21 and 22: combines the effects of airflow, ef
Page 23 and 24: 60 Figure 11: Performance at All Va
Page 25 and 26: Figure 22 and Figure 23 are plots o
Page 27 and 28: high speed. Increasing the outlet r
Page 29 and 30: 491-06.12.doc APPENDIX
Page 31 and 32: Appendix - Figures Intake Airflow (
Page 33 and 34: Appendix - Figures Power (W) Wet-Bu
Page 35 and 36: Appendix - Figures Water Consumptio
Page 37 and 38: 491-06.12.doc A-7 Table 6: OASys T
Page 39 and 40: 491-06.12.doc A-9 Table 6: OASys Te
Page 41 and 42: 491-06.12.doc A-11 Table 6: OASys T
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Laboratory Evaluation of the OASys Indirect/Direct Evaporative

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