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HOT WATER RESET

Some HVAC systems use a set of fan systems called unitventilators.  These systems are very inefficient, often relying on the temperature outside of the building as the indicator to heat the water and often compromise the comfort of occupants of the space they are used in.  ASP has developed a case study outlining how these systems can take into consideration the conditions inside the building, making them far more efficient.

Key Benefits

  • Significant money savings
  • Significant reduction in pollution
  • Health and environmental benefits for us and our children

The problem, from an energy point, with this type of unitventilator is that the hot water flows continuously through the heating coil. A damper arrangement is used to allow the air to flow through the heating coil, deflect the air to bypass the heating coil or blend the air to various temperatures to select the amount of heat the room requires. Even when all the air is theoretically bypassing the coil, heat escapes into the air stream. This causes the unit to automatically bring in excessive fresh air to compensate for the unwanted heat.

The problem, from a comfort point, is that often the amount of heat escaping is greater than the cooling capability of the unit, even when the unit is on full cooling. The room over-heats while it is actually ventilating with about 500% more cold fresh air than required by code.

View our full Hot Water Reset Report


 

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