LET US RESOLVE COMPLAINTS FOR YOU
Facility managers go to great lengths to keep facilities comfortable for workers, as this comfort is directly tied to worker productivity. Unfortunately, it is very difficult to keep all of the occupants happy.
Complaints usually come from building occupants who may not be able to distinguish between drafts and being too cold or between stuffiness and being too hot. If you hear, “The room is stuffy,” the true problem could be temperature, solar load, radiant heat from windows and walls or lack of ventilation.
Hot and cold problems can be caused by many factors: too little capacity, too much capacity, lack of zoning, too little control, varying space usage, varying solar load, changes in occupancy, changes to the space envelope, drafts and diffuser performance, or too little ventilation.
Start the hot/cold complaint review by evaluating an occupant’s complaint. Then review the HVAC equipment performance for proper operation followed by a system design analysis.
It is worth validating the hot/cold complaint to evaluate whether the complaint is an HVAC issues or a management issues. For typical comfort conditions, 5% of the people will be dissatisfied. Research finds that even with perfect temperature control complaints occur. If individual occupant control is not justified, do not expect every occupant to be satisfied with the same conditions.
The majority of hot/cold complaints can be diagnosed by observation, load calculations and recording thermometers.
The steps to investigating a hot/cold complaint are:
- Define and validate the complaint
- Check the HVAC system equipment operation
- Calculate the building a space loads and verify that there is sufficient capacity
- Review zoning conflicts
- Test the zone for good and stable temperature control
- Review draft problems
- Measure the humidity level to verify it is below the Standard 55 upper dew-point limit of 62.2°F (Sometimes more rigorous and costly measures are necessary as explained in Items 8 and 9.)
- Compare the load variation characteristics of the different spaces in each zone
- Analyze the Air Diffusion Performance Index (ADPI) or measure the omni-directional drafts.
AAA Energy Service Co. engineers and technicians are experts at resolving your occupants’ comfort complaints. Let us make your life easier, and your occupants happier.
Call AAA Energy Service to discuss how we can help!
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