HVAC 3.pptx - Energy Management in HVAC Systems niversity of Jordan UJ Part 3 Energy Conservation Opportunities Outline • Surveying existing systems

HVAC 3.pptx - Energy Management in HVAC Systems niversity...

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niversity of Jordan - UJ Energy Management in HVAC Systems Part 3: Energy Conservation Opportunities
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niversity of Jordan - UJ Outline Surveying existing systems Energy conservation measures: Thermal comfort Indoor air quality Maintenance Operating schedule Heat recovery Control strategies Equipment efficiency Distribution Energy System modification
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niversity of Jordan - UJ Surveying Existing Conditions In surveying the HVAC system(s) in a facility, the first step is to find out what you have to work with: what equipment and control systems exist. It is usually beneficial to divide the HVAC systems into two categories: equipment and systems which provide heating and cooling , and equipment and systems which provide ventilation. It is essential to fully document the type and status of all equipment from major components including boilers , chillers , cooling towers and air-handling units to the various control systems: thermostats, valves and gauges, whether automated or manual.
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niversity of Jordan - UJ Surveying Existing Conditions This is in order to later determine what elements can be replaced or improved to realize a saving in energy consumed by the system. It is best to talk to operators and/or users of the system who know a lot more about how the system operates than the engineers or managers. The second step is to determine how the system is operating.
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niversity of Jordan - UJ Surveying Existing Conditions This requires that someone measure the operating parameters to: Determine whether the system actually operates as it was specified to operate. Determine the system efficiency under realistic conditions. This may be significantly different from the theoretical, or full-load efficiency. Determine how the system is operated. What are the hours of operation? Are changes in system controls manual or automatic?
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niversity of Jordan - UJ Surveying Existing Conditions If the system is no longer operating at design conditions, it is extremely useful to determine what factors are responsible for the change. Potential causes of operational changes are: modifications in the building or system and lapses in maintenance. Have there been structural or architectural changes to the building without corresponding changes to the HVAC system? Have there been changes in building operations? Is the system still properly balanced? Has routine maintenance been performed? Has scheduled preventative maintenance been performed?
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niversity of Jordan - UJ Surveying Existing Conditions Finally, it is useful to determine whether the system can or should be restored to its initial design conditions. If practical, it may be beneficial to carry out the needed maintenance before proceeding to analyze the system for further improvements.
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