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BTC-N Closed Cooling Tower Counter Flow
Product Description
The BTC series closed cooling tower utilises water and air as cooling media, exchanging heat with the high-temperature working fluid within the coil. The high-temperature working fluid releases heat and transforms into ambient-temperature fluid. Internally equipped with a water distribution system, cooling coils, and water separators, externally fitted with a circulating water pump and electronic water treatment, with an axial fan mounted at the top. During operation, the axial fan creates a negative pressure environment inside. Cooling water is distributed uniformly across the coil surface via the water distribution system, enabling heat exchange between the high-temperature working fluid and the water and air surrounding the coils. This enhances the cooling effect significantly. After absorbing heat from the coil walls, the cooling water temperature rises sharply. Part of the cooling water vaporises into steam, while the non-vaporised portion returns to the sump tank. The sump pump then recirculates this water back into the water distribution system for continued operation. Water lost to the atmosphere is replenished promptly via a float valve in the sump tank, which regulates the water level.
Core Definition
Counterflow closed cooling towers (where ‘N’ in the model designation denotes counterflow) are closed-loop cooling systems that achieve highly efficient heat exchange by directing the cooling medium (air) to flow in the opposite direction to the cooling water. This counter-current fluid flow design enhances heat transfer efficiency, making it suitable for industrial applications demanding superior cooling performance.
Detailed Operating Principle
1. Synergy between medium and core components:
Utilising water and air as cooling media, it facilitates heat exchange with high-temperature working fluids within the coils. The unit integrates core components including a water distribution system, cooling coils, and removable water separators internally. Externally, it incorporates a circulating water pump and electronic water treatment unit, with an axial fan mounted atop to form a complete cooling cycle system.
2. Counter-current movement of air and water flow:
During operation, the axial fan creates negative pressure within the unit. Fresh external air enters through the bottom air intake and flows vertically upwards. Simultaneously, the circulation pump conveys cooling water from the reservoir to the top water distribution system. Through patented high-flow anti-clogging nozzles, the water is uniformly sprayed onto the cooling coil surface. The cooling water then flows downwards along the coil walls – creating a distinct counter-current flow pattern where air enters from below and exits above, while cooling water enters from above and exits below.
3. High-efficiency heat exchange process:
High-temperature working fluid circulating within the cooling coils undergoes triple heat exchange with the cooling water on the coil outer walls and the upward-flowing air: the coils transfer high-temperature heat to the cooling water on their outer surfaces; the cooling water rapidly absorbs this heat, causing its temperature to rise sharply and partially vaporising into water vapour; the upward-flowing air swiftly carries away the water vapour and heat from the coil surfaces. Counter-current airflow turbulence further enhances heat exchange efficiency.
4. Circulation and replenishment mechanism: Unvaporised cooling water flows along the coil walls back to the bottom sump, where a circulation pump returns it to the water distribution system for reuse. Water lost through evaporation is automatically monitored and replenished by a float valve in the sump, ensuring continuous and stable cooling circulation. Air laden with moisture passes through a top-mounted demister for filtration and dehumidification before being discharged via the hot air outlet, preventing water wastage.
