Cool-phase
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Low energy cooling and ventilation system

Comfort Cooling Ventilation & Heat Recovery Case Studies Accreditation & Modelling COOL-PHASE® is a low energy cooling and ventilation system that creates a comfortable, fresh and healthy indoor environment and reduces the running costs of buildings. COOL-PHASE uses a thermal energy store utilising a Phase Change Material (PCM) in combination with an intelligently controlled Air Handling Unit to actively ventilate and cool the building. The COOL-PHASE system can maintain temperatures within the comfort zone, while radically reducing energy consumption by up to 90%, compared to a...

Applications The COOL-PHASE system can be installed in new buildings or retrofit to existing ones, from small modular areas to large open plan rooms. The system can be suspended below a ceiling (a floor to ceiling height of 2.8 m or greater is recommended) or within a false ceiling void (a minimum ceiling void of 500 mm is recommended). The COOL-PHASE system has been designed to meet the requirements of clients who wish to have a greater level of control over internal temperatures than is achievable with other low energy approaches, but without the high energy and maintenance costs of...

How it Works The COOL-PHASE system uses the concept of a ‘Thermal Battery’ to capture and store heat. The Thermal Batteries use the latent heat property of materials to store large amounts of energy, which is charged and discharged by passing air through a heat exchanger. Materials that change phase at room temperature are frequently referred to as Phase Change Materials (PCMs). To melt or freeze the material contained within, each system requires the same amount of energy to heat up or cool down 32 tonnes of concrete by 1 oC. Comfort cooling In the UK, even in the summer, there is a 10 to...

Intelligent thermal mass The effect of adding thermal mass to a building is a well understood principle, effectively increasing the time that it takes heat gains to raise the temperature of the building. When combined with measures to control internal and external heat loading, it can be a very effective method of ensuring that the building meets requirements for thermal comfort. However during a period of hot weather, temperatures will invariably rise over time, as there is no method of actively dissipating the build‑up of heat. Therefore the effect of adding thermal mass can diminish over...

COOL-PHASE Unit with Fascias DUCT - An insulated duct DIFFUSERS & FASCIA - Special air CASE STUDY E1 Business Centre & Holywell Centre connects the COOL-PHASE diffusers are built into the fascias to ensure air can circulate around the room evenly system to the outside air. and prevent uncomfortable draughts. THERMAL BATTERY MODULE - The Thermal Batteries are mounted in a module containing a heat exchanger. This allows heat to be transferred from the air to the Thermal Batteries, or vice versa. The Thermal Battery module has no moving parts and does not require any power, therefore, they are...

COOL-PHASE Unit above false ceiling FILTER BOX & EXTERNAL FILTER - A filter box and G4 filter is positioned at the point where air enters the building to remove particles, allergens and pollutants from the incoming air. An access hatch is provided to change the filter. USER INTERFACE – A user interface is provided in each zone. RE-CIRCULATION FILTER - A G2 grade re‑circulation filter is positioned behind an access hatch on the fascia or within the re‑circulation duct when installed above a false ceiling. EXHAUST GRILLE – An outlet for air to leave the space is required. This can be through...

Comfort Cooling PCM Heat Exchanger External Air Direct Ventilation Operating modes: In summer the COOL-PHASE system monitors indoor and outdoor temperatures, internal CO2 levels and humidity. Air can be either pulled in from outside, re‑circulated within the environment or mixed. effect for the following day. The system will alter the charge rate and length of charge depending on the temperature of the outside air, switching off when the Thermal Batteries reach the full capacity. Summer charge mode: Ventilation mode: When the room is unoccupied at night, the system will automatically pull...

Free Cooling (Ventilation) Night time Cooling (Building + flush) The graph on the right shows the performance of the system in a simplified model. The black line shows the temperature in the room varying between 14 °C at night and 28 °C during the day. The temperature in the rest of the building, with no cooling or heating, is shown by the red line and peaks around 30 °C. The blue line shows the temperature within the same space with COOL‑PHASE installed, showing a significant reduction in the peak temperatures. The COOL‑PHASE system is not designed to match the outright performance of the...

Ventilation & Heat Recovery Winter charge mode: During the winter months when either the room is The COOL-PHASE system works all year round to create a fresh and healthy environment by monitoring internal CO2 levels and ensuring a supply of fresh air into the building. unoccupied or the temperature exceeds a preset level, the COOL‑PHASE system will re‑circulate internal air through the heat exchanger to charge the Thermal Batteries and capture the excess heat. This waste heat can then be used to temper cool fresh air entering the building. In typical office applications the temperature will...

Case Studies University of East London Monodraught COOL-PHASE units were installed in three computer suites at the Stratford Campus to reduce high heat gains from IT equipment and people. Notre Dame School Two COOL-PHASE systems were installed in an IT classroom in April 2011. The classroom (approx. 70 m2) has high internal heat gains through IT equipment and glazing.

Controls and user interface: 4000 x 800 x 400 mm (for suspended system supplied with fascias) • Wall mounted user controls with room temperature, humidity and CO2 sensors. • COOL-PHASE control system including temperature and humidity sensors. • Master / slave mode to control multiple units in a single zone. • Optional connections to compatible window, natural ventilation (eg. WINDCATCHER® natural ventilation system) or heating controls. • Optional ‘traffic light’ indicator for windows. Colour: Powder coated white. Alternative colours available on request. Performance specification: •...