- Economical Compliance With ASHRAE Standard 62
- To achieve acceptable indoor air quality, ASHRAE Standard 62 recommends a three-to-four-fold increase in the amount of outdoor air provided to most facilities. In addition, the ASHRAE Standard recommends that this increased outdoor air quantity be introduced continuously while spaces are occupied. By recovering up to 80 percent of the total energy normally exhausted from occupied spaces, the SynergyPLUS® (SP) module enables the Trane Precedent™ unit to effectively handle this increase in outdoor air load without the need for a larger sized package and without increasing energy consumption.
- Reduced Equipment First Cost
- Without the addition of effective energy recovery, the capacity of HVAC systems must be increased greatly to handle the greater outdoor air loads. Increasing equipment size often requires the addition of reheat and sophisticated control sequences to control both humidity and temperature. The SP module often reduces project first cost by allowing a smaller Precedent unit and duct system to be used without the need for reheat or complex controls.
- Improved Cooling Season Humidity Control
- Operation of conventional HVAC systems is governed by a thermostat, i.e., in response only to the conditioned space temperature. When the cooling coil is cycled off, the outside air fan is typically shut-off as well. Thus, no ventilation is provided to the conditioned space until the thermostat calls for cooling. If the outside air fan is allowed to run while the cooling coil is off, then warm, humid air is directed to the space. In both of these cases, indoor space humidity levels will increase above guideline levels, i.e., 60 percent relative humidity.
- Since the SP unit dehumidifies and cools the incoming outdoor air, the supply air conditions are close to the return air conditions. This effectively produces a buffer against high outdoor latent loads resulting in acceptable indoor humidity levels.
- Reduced Humidification Requirements During the Heating
- Supplying 15 to 20 cfm/person of cold, dry outdoor air to a facility during the heating season can result in unacceptably low indoor relative humidity. Most facilities require humidification which is costly to operate and maintain. The SP unit captures the moisture generated within the space to provide free humidification during the heating season, therefore maintaining a healthier indoor environment.
- In moderate climates with short heating seasons, this may be sufficient to completely eliminate the need for any humidification equipment.
- Improved Comfort of Occupied Spaces
- As outdoor air is supplied to the space, the heating/cooling source is cycled on and off to maintain temperature. When it is cycled off, very cold or very warm/humid air can be "dumped" on the occupants, causing wide temperature fluctuations that makes for a very uncomfortable environment. The SP module solves this problem by providing moderated supply air conditions even as the Precedent unit is cycled on and off.
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Trane, Voyager, Precedent, and Modular Climate Changer are registered trademarks of American Standard Incorporated.
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