How it works - Operation
Unlike AC, the COOL-PHASE® passive ventilation system is not designed to maintain a
specific temperature, but rather air quality within a designated temperature range. When in its
automatic control strategy, COOL-PHASE will seek to maintain a comfortable temperature
range. Dependant on the operating conditions, the COOL-PHASE system will try to increase or
decrease the temperature of the air. However, the integrated CO2 sensor will always override
the temperature control if the level exceeds 1200ppm, allowing for the ingress of fresh air.
In basic terms, the COOL-PHASE system operates, fully automatically, under three conditions
fresh air, cooling and heat recovery. Under the cooling conditions, the PCM is used to absorb
heat from the air and in heat recovery mode the PCM is used to temper incoming fresh air.
In order to provide the cooling effect, the system requires the PCM
to be charged. This charging occurs over night, between 10pm and
6 am, when the tangential fans are set to full. The increase in flow
rate has two effects; the heat exchangers absorb the cold night-
time air, transferring the cooling effect to the PCM and the interior
space is flooded with cold air, providing conventional night-time
cooling. During this operation, the centres of the micro-capsules of
wax solidify, allowing for a large amount of Coolth to be absorbed.
During the daytime, the system will draw fresh air into the space,
as long as the outside air temperature is below approximately
23°C, the system will simply provide fresh air without using the
PCM. If however the temperature exceeds 23°C, the system will
close off the insulated exterior damper and open the interior
damper and re-circulate the air within the space. The PCM is then
pumped through the heat exchangers, allowing heat absorption to
take place.
The inverse is true for the heat recovery mode. During late
afternoon when the interior space has been heated through
associated gains, the system will re-circulate a proportion of the air
through the system capturing heat within the PCM.
The following day, the energy can then be released, tempering the
incoming fresh air.
click image to enlarge
click image to enlarge
click image to enlarge
click image to enlarge
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In order to provide the cooling effect, the system requires the PCM
to be charged. This charging occurs over night, between 10pm and
6 am, when the tangential fans are set to full. The increase in flow
rate has two effects; the heat exchangers absorb the cold night-
time air, transferring the cooling effect to the PCM and the interior
space is flooded with cold air, providing conventional night-time
cooling. During this operation, the centres of the micro-capsules of
wax solidify, allowing for a large amount of Coolth to be absorbed.
During the daytime, the system will draw fresh air into the space,
as long as the outside air temperature is below approximately
23°C, the system will simply provide fresh air without using the
PCM. If however the temperature exceeds 23°C, the system will
close off the insulated exterior damper and open the interior
damper and re-circulate the air within the space. The PCM is then
pumped through the heat exchangers, allowing heat absorption to
take place.
The inverse is true for the heat recovery mode. During late
afternoon when the interior space has been heated through
associated gains, the system will re-circulate a proportion of the air
through the system capturing heat within the PCM.
The following day, the energy can then be released, tempering the
incoming fresh air.
click image to enlarge
click image to enlarge
click image to enlarge
click image to enlarge
