A .  Direct Evaporative Condenser Pre-Cooler

The major CoilCool structural element is its stainless steel sheet metal enclosure that is custom-fit to each rooftop unit. This “unibody” assembly gains its strength from shape and connections rather than from metal thickness. The design facilitates an affordable “lifetime” enclosure that will outlast the rooftop unit to which it is attached. The integral bottom reservoir includes a screened stainless steel top that limits entry of debris, and the reservoir’s smooth flat bottom with rimless drain opening allows easy annual cleaning. On units with inward-slanting condenser coils, the enclosure includes hinged triangular panels that provide easy coil access. The unique design also facilitates easy removal of the evaporative media yet holds the media securely to prevent movement in windy conditions.

D .  Sump / Reservoir

The CoilCool enclosure is designed with an integrated reservoir beneath the evaporative media. This sump/reservoir captures the water that has passed down through the media and holds it for recirculation by the submersible pump that is contained within the reservoir.

E .  Pump

A submersible pump is the primary operating component in the CoilCool system, moving cool water from the reservoir beneath the evaporative media to, and through, the vent air pre-cooling coil, and then back to a distribution tube above the evaporative media. Water flowing through the coil cools the warm incoming fresh air stream, and water flowing by gravity downward through the media cools the air entering the large condenser coil through which refrigerant is discharging heat to the outdoor air. The submersible pump strategy maximizes protection of this vital component, and maintains a clean unit appearance without external components and wires. ICI selected the current pump series for durability and energy efficiency after extensive lab and field testing. Pump access requires no tools; the technician simply pulls outward on the handle of the removable perforated metal media holder above the pump, removing the entire media section.

F .  Water Coil

This radiator-like heat exchanger cools the fresh air stream required by building codes to maintain indoor air quality in commercial buildings. It is also the feature that distinguishes the patented CoilCool product from conventional condenser air pre-coolers. Cool water is pumped directly from the CoilCool reservoir through this efficient coil, typically cooling outdoor air almost to indoor air temperature. The coil uses copper tubes and aluminum fins, and is carefully designed to drain water back to the reservoir when the pump turns off.

G .  Bleed System

Where the supply water exceeds about 30 PPM of hardness mineral, ICI supplies a CoilCool “bleed” system that limits the concentration of hardness minerals in the CoilCool water loop. Without the bleed system, minerals can build up on all surfaces that the water contacts, compromising both appearance and function of the system. ICI technicians and trained CoilCool installers measure hardness content of the supply water and specify a bleed rate. A bleed valve is then set to the specified rate. An upstream filter protects the bleed valve against clogging. Cleaning the bleed filter is important to maintaining performance and maximizing media life.

SCHEMATIC     COMPONENTS     PERFORMANCE     SUPPORT     ECONOMICS