ِADIABATIC PRE-COOLING SYSTEMS
Adiabatic Pre-CoolingWet wall SystemPRINCIPLES
Closed circuit coolers and refrigerant condensers which utilize air-cooled heat exchange are growing in popularity for various reasons, but mainly to conserve water. However, in climates with high ambient temperatures, air-cooled heat exchanges require too much capital cost, consume too much energy and/or require too much plan area. In many cases, incorporating adiabatic pads on an air-cooled heat exchange (a.k.a., an adiabatic fluid cooler or refrigerant condenser) is the best solution to balance costs, energy consumption and the size or number of units required. Adiabatic cooling system is an accessory which is presented for decreasing water/glycol outlet and condensation temperature in dry coolers and condensers respectively and also, to be increased product efficiency. 
HOW IT WORKS
Hot process fluid enters the inlet header connection, shown in red.
Heat from the process fluid dissipates through the coil tubes surface
and out to the fins. The adiabatic system involves fully wetting
a fibrous pad located in front of the coil.
Ambient air is drawn through the adiabatic pre-cooling pad
by the fans located on top of the unit.
The air is humidified as it passes through the adiabatic pad
, decreasing the ambient dry bulb temperature within a few
degrees of the ambient wet bulb temperature.
This new air temperature is referred to as the depressed dry bulb.
This pre-cooled air is then drawn through the tube and fin surface, offering a substantial increase in heat rejection capability. Heat from the process fluid transfers to the air and discharged to the atmosphere. Cool process fluid exits the unit through the connections shown in blue.
THE PROCESS
In the systems with adiabatic cooling pads, the pads are placed in a special casing which is mounted in front of the fin block and can be easily installed and disassembled in non-need seasons.
With the aid of the pump, water wets the pads from the upper part of the pad system. Dry and hot outside air is per-cooled by passing through wet cooling pads. The temperature of the air that contact with the wet cooling pads is approximated to the wet thermometer temperature.
The water does not contact directly with the fins.
Thus fins lifetime is longer than the direct spraying systems. Also pads prevent contamination of fins.
The system ensures that the product efficiency is increased with minimum water consumption. The system is only enabled, when necessary, with the control system.
Cooling pad application used for vertical and V type products can be installed in two ways a non-circulating and recirculating.
System Efficiency: +30 % increased cooling capacity system efficiency +30%
Reduced or Eliminated Water Consumption Compared to traditional evaporative systems, the eco-Air series will either eliminate or dramatically reduce water consumption. Adiabatic models only use water when the ambient conditions and load require it. Reducing water consumption also reduces the ongoing expenses related with the cooling equipment such as purchasing, treating, and disposing of water. When the eco-Air adiabatic models are used in conjunction with the EVAPCO controls package, water conservation is maximized based on proprietary PLC logic.
Reduced Maintenance
Scaling, corrosion, and water born bacteria concerns are minimized or eliminated with dry and adiabatic cooling equipment. The eco-Air Series reduces the maintenance traditionally associated with fully evaporative systems. The eco-Air adiabatic condenser is designed as a once through system, meaning it has no pump and no basin to hold water, which further reduces the time required for maintenance. Additionally, the adiabatic pads filter the air before reaching the coil, limiting the exposure of dirt and debris to the tube and fin heat transfer surface. Both NEMA and EC motor options require zero routine maintenance. There are no bearings to grease, belts to adjust, or fans to pitch and balance.
BENEFITS
- Wetted pads can be utilized for pre-cooling entering air, resulting in greater energy savings, and increased capacity, with minimal water use
- Great for high ambient dry bulb climates or high temperature applications
- Once-through design
- No water treatment required
- No cold water basin or pump
- No drift
ICOOL, the leading company in the field of evaporation technology and Adiabatic systems, offers the latest Chillers pre-cooling systems using high-efficiency evaporative cooling pads (Known as wet media, wet wall, cellulose cooling pads), which have proven their capabilities for use in the weather of Dubai and the Gulf.
ICOOL, with its long experience, guarantees you the best results in the field of energy saving and increasing the efficiency of the chiller
