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Article reproduced with permission from "Factory Equipment" magazine (0.1 MB)
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What is Coolstream?
Colt Coolstream is a natural cooling system which employs the principle of adiabatic evaporation. Evaporative cooling is an efficient and effective alternative to conventional air conditioning. This is particularly so in storage or production facilities, where these buildings are simply too large for air conditioning to be cost effective.
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Colt Coolstream - Evaporative cooling is an efficient and effective alternative to conventional air conditioning |
How does Coolstream work?
The process involves drawing hot dry air across wetted media, which results in an exchange of energy and a significant reduction in the temperature of the air. The warmer the outside temperature, the more efficiently evaporative cooling works. Above 300C, the air can cool down adiabatically by 100C or more, resulting in very efficient cooling. Evaporative cooling is 4 to 7 times more economical than conventional systems, and at a lower investment.
In addition, evaporative cooling involves supplying 100% fresh air and thereby maintains air quality. In effect, it's an enhancement of an input ventilation facility, which means that it can be used throughout spring and summer with the cooling function only being operated when conditions dictate. Heat is normally removed at high level via natural ventilators, providing a pleasant temperature at the working area.
Coolstream is well suited for retrofit into existing ventilation systems, including large spaces in which a pure ventilation system cannot ensure a comfortable internal working climate. Coolstream is well suited to industries such as plastics, metal, or food, and for installation in warehouses, restaurants and shopping centres, or leisure and exhibition centres. Colt can advise on all aspects of the ventilation design.
Being environmentally safe, with low installation and very low running costs, Coolstream is a reliable and green system with proven, non-complex technology.
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How Coolstream works
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Versions
Coolstream is manufactured in two versions, with two nominal supply air flows of either 2.77 m3/s or 4.44 m3/s, each available with a 230V AC motor (variable speed) or 400 V AC motor (two speed).
Safe and eco-friendly
Coolstream is so designed as to ensure that water circulates safely, that is to say at the correct temperature, and water is refreshed so to avoid the growth of bacteria. No CFC or other similar refrigerants are required. Aluminium fins prevent the incidence of sunlight and prevent the desorption medium from being affected by the external environment. Furthermore, the unique shape of the desorption medium prevents light pervading through the medium and hence guarantees an optimum water quality: since the unit remains completely dark inside, the process water keeps cool and is of high quality.
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A slowly revolving, very quiet axial fan
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One remote control can handle up to 16 units
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Coolstream has been extensively tested and certified hygienically in accordance with VDI 6022 and EN 13779 ("Ventilation for non-residential buildings. Performance requirements for ventilation and room-conditioning systems"). This is a rigorous standard for air conditioning systems and attests to the high quality of supply air.
Features and Benefits
- Corrosion resistant aluminium housing with double-layer polyester and epoxy coating of drip tray
- Highly durable desorption medium with large surface area and low resistance to air flow thus efficient in heat transfer
- Integrated water quality system. Safe circulation, temperature and renewal of water to avoid the growth of bacteria.
- High performance of adiabatic cooling, with up to 90% efficiency
- Only uses 100% outside air, so no stuffy internal air is recirculated
- Low cost of operation and maintenance, with a power consumption of only about 1 kW per hour and 0.055 m³/h water per hour when providing 2.77 m³/s of supply air
- Two speed or variable speed options
- Digital control with master/slave operation potential to be linked with a Building Management System (via Modbus)
- Quiet operation. |
