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Thursday, April 4, 2019

Operating Strategies for Economizer Control in an Air Conditioning System




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Description
A typical economizer in a air conditioning system is investigated in this paper. New operating strategies of the economizer are proposed. An economizer consists of three coupled dampers - an outdoor air, a recirculation, and a discharge damper - controlled so that the amount of outdoor air may be varied From a minimum to 100% of the supply air. Traditionally the three dampers are coupled. In a new strategies only the outdoor and recirculation dampers are coupled and the discharge damper is always Fully open during operation. An additional strategy involves linearizing the damper area as a function of the control signal by means of a software algorithm. Fan energy requirements for the new
strategies are compared to those for the traditional strategy. The amount of fresh air may be controlled by heating and cooling considerations or by indoor air quality considerations. Carbon dioxide (CO2) concentration is an indication of indoor air quality. The objectives of the investigation were to determine the best strategy to minimize fan energy consumption, and to control ventilation by demand as indicated by room CO2 concentration. Numerical system models were constructed to analyze system performance. An experimental system was built and tested to verify the models and
simulations proposed in this paper.

Content:-
LIST OF FIGURES
LIST OF TABLES
NOMENCLATURE
1 .0 INTRODUCTION
2.0 LITERATURE SURVEY
3.0 THE SYSTEM MODEL
4.0 AIR QUALITY CONTROL USING A CO2 CONCENTRATION METHOD
5.0 EXPERIMENTAL INVESTIGATION
6.0 CONCLUSIONS
7.0 REFERENCE
8.0 BIBLIOGRAPHY
1. APPENDIX - SYSTEM MODEL
11. Appendix -Demand Control Model
III. Appendix -Selected Functions Used for Experimental Controls 

Author Details
"Feng Zhao"




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