Cooling mechanism

One of the widest uses of heat exchangers is for air conditioning of buildings and vehicles. This class of heat exchangers is commonly called air coils,jewellery manufacturers or just coils due to their often-serpentine internal tubing. Liquid-to-air, or air-to-liquid HVAC coils are typically of modified crossflow arrangement. In vehicles, heat coils are often called heater cores.

High efficiency
Modine's expertise has always been in heating and cooling, and Schires said that knowledge is combined in the new package ventilation system.
For example, McBurney said, as fresh air is drawn in, an equal amount of indoor air must be exhausted. The unit's heat exchanger increases cooling or heating efficiency.
"We use it to temper the incoming air" and save energy, he said. "It uses waste energy you would dump outside."

On the liquid side of these heat exchangers, the common fluids are water, a water-glycol solution, steam, or a refrigerant. For heating coils, hot water and steam are the most common, and this heated fluid is supplied by boilers, for example.tahitian pearl For cooling coils, chilled water and refrigerant are most common. Chilled water is supplied from a chiller that is potentially located very far away, but refrigerant must come from a nearby condensing unit. When a refrigerant is used, the cooling coil is the evaporator in the vapor-compression refrigeration cycle. HVAC coils that use this direct-expansion of refrigerants are commonly called DX coils.

That can be combined with a high-efficiency gas or electric furnace to raise the temperature of outside air by up to 100 degrees. Modine says the gas furnace is 93 percent efficient.
Another advance, McBurney said, is the sophisticated building management system controls Modine got from its 2005 acquisition of Airedale International Air Conditioning Ltd.

On the air side of HVAC coils a significant difference exists between those used for heating, and those for cooling. Due to psychrometrics,golden south sea pearl air that is cooled often has moisture condensing out of it, except with extremely dry air flows. Heating some air increases that airflow's capacity to hold water. So heating coils need not consider moisture condensation on their air-side, but cooling coils must be adequately designed and selected to handle their particular latent (moisture) as well as the sensible (cooling) loads. The water that is removed is called condensate.

The result of all that design and technology, McBurney said, is that while competitors' rooftop units may be efficient at maximum heating or cooling power, Modine's system will also be highly efficient at everyday levels.
"The more you run it, the more it'll save you," he said. "We believe it's the most efficient way to ventilate a space."
And perhaps to boost Modine's bottom line.

For many climates,freshwater pearl water or steam HVAC coils can be exposed to freezing conditions. Because water expands upon freezing, these somewhat expensive and difficult to replace thin-walled heat exchangers can easily be damaged or destroyed by just one freeze. As such, freeze protection of coils is a major concern of HVAC designers, installers, and operators.
The introduction of indentations placed within the heat exchange fins controlled condensation, allowing water molecules to remain in the cooled air. This invention allowed for refrigeration without icing of the cooling mechanism.