Forced draft cooling tower

Forced draft cooling tower

Difference between forced draft cooling tower and induced

Delta’s Pioneer Forced Draft Towers offer efficiency and affordability. The Pioneer® forced draft, counter flow concept is available in single module capacities and cooling tower tonnages ranging from 10 to 100 cooling tons. Make the switch to Delta right now.
Delta Cooling Towers, the technology-leading cooling tower maker, is here for you if a passing storm has destroyed your cooling tower or it has unexpectedly given in after years of disrepair. Although a cooling tower problem can be a frustrating situation for engineers and contractors, our knowledgeable experts turn your concerns into solutions.
Our top-of-the-line cooling towers have a modular design that includes seamless molded plastic (HDPE) shells, corrosion-resistant construction, and a forward-curved centrifugal blower with fully enclosed motors.
Our cooling towers are built in an American factory and come with a 20-year shell warranty for ease of installation. A PVC water distribution system with non-clog wide orifice removable nozzles and high-efficiency PVC fills is also available.

Natural, induced, forced and balanced draft explained

A cooling tower is a heat rejection system that releases waste heat into the atmosphere by lowering the temperature of a water stream. Cooling towers can either use water evaporation to eliminate process heat and cool the working fluid to near the wet-bulb air temperature, or they can rely entirely on air to cool the working fluid to near the dry-bulb air temperature, as in closed circuit dry cooling towers.
Cooling the flowing water used in oil refineries, petrochemical and other chemical plants, thermal power plants, nuclear power plants, and HVAC systems for cooling buildings are all popular applications. The key types of cooling towers are natural draft and induced draft cooling towers, which are classified based on the form of air induction into the tower.
Cooling towers range in size from small roof-top units to extremely large hyperboloid structures (as seen in the adjacent image) that can be up to 200 meters tall and 100 meters in diameter, or rectangular structures that can be over 40 meters tall and 80 meters long. Hyperboloid cooling towers are most often associated with nuclear power plants, but they are also used in some coal-fired plants and, to a lesser degree, in some major chemical and other industrial plants. The vast majority of cooling towers, including several units mounted on or near buildings to discharge heat from air conditioning, are much smaller than these massive towers.

How does a forced draft cooling tower work

Cold air enters at the bottom of the building and warm moist air is released at the top of the tower in wet cooling towers. There are two types of towers available: counterflow and crossflow.
Natural draft cooling towers with fan assistance (wet cooling towers) combine the benefits of both natural and mechanical draft cooling towers. It’s the best technology for places with limited room or height (or both) and where the heat load needs to be controlled. It’s close to how natural draft cooling towers operate. Fresh air enters from a gap at the bottom of the cooling tower, which is structurally similar to a natural draft cooling tower but has fans at the foundation. Instead of allowing the air flow to be dominated by the tower height and air density difference, these fans are used to accelerate the air, producing a forced draft mechanism. This makes for a more compact tower and equipment design without losing any of the benefits of a natural draft cooling tower, such as virtually no plume output.

Forced and induced draft cooling tower

The water delivery system at the top of the tower receives warm water from the heat source. Wide orifice nozzles spread the water evenly around the wet deck fill. Simultaneously, air is pushed upward through the wet deck fill opposite the water flow through the air inlet louvers at the base of the tower. The heat from the remaining water is removed by evaporating a small portion of the water. The fan forces warm moist air to the top of the cooling tower, where it is released into the atmosphere. The cooled water drains to the tower’s bottom basin and is transferred to the heat source. Since the warm humid air is directed up and away from the device, the LSTE design’s vertical air discharge and the gap between the discharge air and fresh air intakes minimize the risk of air recirculation.