EXERCISING COMMON SENSE Before a person can improve a system's energy performance, or even calibrate an existing system, it is necessary that he or she acquire a full understanding of the mechanical and control components' relationships. This means that person completely understands a logical plan that they would employ if they were manually operating the mechanical system. THE PLAN 1) Look at the fan system drawing on the next page and consider operating it manually. 2) Relating to this case study you must have access to all relevant values for temperatures and humidity. If you do not know the temperature or the relative humidity values, you can not determine the action required correcting an unacceptable condition. 3) You must be able to gradually open or close the dampers for fresh air, return air and exhaust air. 4) You must be able to gradually open or close the chilled water valve and the heating valve. 5) You must be able to start and stop the humidity spray pump 6) You must be able to start and stop the fan if it is not required at unoccupied times. 7) You must understand the impact that each function exerts overall on the system when employed to varying degrees. When you understand all the interrelationships between the mechanical system and the building served, you are prepared to assess the control system. Remember if the control system does not make the same mechanical adjustments as an intelligent human, given the same input values, there is something wrong with the control system. 8.92
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