The Sensible Solution to humidity control:

Our patented TRICOIL air conditioning system is an efficient, cost-effective method
of enhancing the indoor air quality through humidity control.  The system is very
flexible to suit a wide range of applications.  We can accommodate any amount of
outside air from 0% to 100% for direct space temperature and humidity control or for

introduction to the space by other systems as preconditioned ventilation air.  We
have provided systems for schools, hospitals, nursing homes, dormitories, process
applications, hotels, museums, retail, theme parks, natatoriums, indoor shooting
ranges, and single and multi-family residential.  The method is particularly well suited

for humid climate air conditioning design including variable air volume systems,
constant air volume systems, multizone units, and units dedicated to pretreatment of

outside air.
Basic TRICOIL System

The basic TRICOIL Systems operates much as a Heat
Pipe System, however, we use water instead of
refrigerant to accomplish the heat transfer. A pump
moves water from a precool coil to a reheat coil. The
system can be controlled by varying the speed of the
pump or by on/off control of the pump.

The TRICOIL System can be applied as a recirculation
air system or can be applied as a DOAS (Dedicated
Outside Air System). In either case the TRICOIL System
provides the most efficient method of obtaining the
desired indoor air quality.

About_TRICOIL for more information on how the
TRICOIL method works
Sensible Equipment Company, Inc.
PO Box 669, Goldenrod, Florida 32733
Phone: (407) 296 - 8068 Email:
Sensible Equipment Company, Inc.
PO Box 669, Goldenrod, Florida 32733
Phone: (407) 296 - 8068 Email:
TRICOIL Applications:
DOAS (Dedicated Outside Air Systems)

TRICOIL is a natural selection for 100% outside air systems. The supply air temperature can be maintained at a
constant neutral temperature or can be maintained at other conditions as needed for BMS control. A bypass
valve to limit water flow through the reheat coil or a variable speed drive on the pump will control the supply air
temperature from exceeding neutral condition. Heat can be added to the TRICOIL loop as needed to maintain
the supply air temperature at the desired condition when the outside air temperature is below a the temperature
to maintain 100% heat transfer. Even though heat is added to the loop there will still be a sufficiently low
enough water temperature leaving the reheat coil
to provide a considerable amount of precooling.
CAV (Constant Air Volume)

The TRICOIL method can be used for recirculation air applications with any amount of outside air up to and
including 100% outside air. The supply air dry bulb and dew point temperature can be automatically adjusted to
maintain the desired room air temperature and relative humidity.  

VAV (Variable Air Volume)

The TRICOIL method can be used for VAV applications As with CAV systems any amount of outside air up to
and including 100% outside air can be accommodated. In VAV applications the supply air volume is reduced to
match reduced indoor sensible cooling loads. A problem with this control is that the latent load typically does
not reduce with reductions in sensible load in typical applications. The result is that at partial cooling load
conditions the room relative humidity increases. To resolve this problem the TRICOIL method reduces the
supply air Dew Point and increases the supply air temperature as a function of the actual supply air volume to
the room. This control adjusts the air handling unit's sensible heat factor to match the part load sensible heat
ratio. The room relative humidity is thereby better maintained under part load conditions.   

FCU (Fan Coil Units)

There is nothing quite as annoying  as a hotel room that is too humid. Fan coil units can be fitted with the
TRICOIL method to resolve this issue. Improves the indoor air quality (IAQ) for a better night's sleep. Actually,
any residential application would benefit from the application of a TRICOIL method.

Multiple Reheat Zones

One air handling unit can be fitted with multiple reheat coils for zoning purposes.  For example, an air handling
unit used for perimeter heating and cooling can be provided with four reheat zones for optimizing the supply air
temperature to each of the zones independent of the others. Each of the zones would derive the heat energy
from one precooling coil. Or there could be a single zone that needs a constant amount of reheat compared to
the balance of the system that requires variable amount of reheat. Two reheat coils would be used for such
applications. Again, only one precooling coil would be used.

Exhaust Air Heat Recovery (EAHR)

Exhaust Air Heat Recovery (EAHR) extends the usefulness of the TRICOIL method through the shoulder
months and into the winter heating system.  When the ambient temperature is too low to transfer the entire
reheat demand the system would benefit from a heat recovery coil in an exhaust air stream. Heat collected in
the exhaust air coil would be transferred to the reheat coil for reheat purposes. If there is no demand for reheat
and the exhaust air temperature is lower than the return air temperature (or outside air temperature for DOAS)
heat can be extracted from the air stream in the precooling coil and sent to the exhaust air coil. During winter
conditions when the system in the heating mode the exhaust air coil can be used as a heat source to preheat
the return and/or outside air to replace or offset the energy required for heating.

Indoor Swimming/ Pools and Therapy Pools

Precise temperature and humidity control are necessary for a quality swimming or therapy experience. Low
humidity would chill the occupants and cause excesive evaporation of the pool water resulting in extra cost for
pool heating. High humidity could result in moisture damaging from sweating on indoor surfaces. The TRICOIL
methods corrects this by independently controlling the supply air humidity and the supply air temperature for
precisely optimized indoor conditions.

Indoor Skating Rinks

Like indoor pools Ice Skating Rinks require precise temperature and humidity control. With a TRICOIL system
there is no need for special dehumidification systems. The TRICOIL system can provide a 42 degree dew point
supply air temperature using a brine cooling medium or a direct expansion cooling system. Using low dew point
air is not necessary. The ice surface will provide part of the indoor dehumidification negating the usefulness of
expensive equipment for the lower supply air dew point. The reheat from the TRICOIL system will provide a
comfortable temperature in the spectator areas and the other areas around the rink. The precooling process
offset a portion of the cooling required for the low dew point supply air. The use of standard air conditioning
components such as central station air handling units and commercially availble chillers for air conditioning
purposes makes for a cost effective system.