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Counterflow closed cooling tower energy consumption mainly from: the tube pump power consumption, power consumption and fan spray water circulation pump power consumption. When closed cooling tower in counterflow evaporative cooling mode, energy consumption includes three or more, when in the air cooling mode, the fan energy consumption includes only a power consumption.
Counterflow fluid coolers and evaporative cooling air-cooled models
When in the closed cooling tower countercurrent air cooling mode, the spray pump off (the fan on, pump off). In the fan on, the process fluid from the fluid coolers mouth into the upper part of the coil, the flow in the coil. Manner as to heat the process fluid passed by sensible heat transfer through the wall to the air flowing through the coil. Coil arrangement specifically designed to ensure that the desired air flow and greater heat exchange area. The fan drive system draws air into the cooling tower, flowing through the coil. An excuse to return to the process fluid source through the lower coil. If the dry bulb temperature is appropriate, this mode of operation can be used to reduce water consumption.
And when in the closed cooling tower counterflow evaporative cooling mode, the process fluid from the coil imported into the upper part of the closed cooling tower, the flow in the coil. In the state of the water pump is turned on, the heat of the process fluid passing through the wall and the coil and the water flows downwardly sprayed surface coil (ventilator opening, the pump open). At the same time, the fan drive system outside air intake, air to spray water opposite directions through the coils. Portion of the water evaporation, the latent heat of the way to remove heat. This evaporative cooling fan mode can save energy and get lower the liquid temperature.
When evaporative cooling, although more energy consumption, but most of the time throughout the year can meet the cooling needs; air cooling, cooling energy can not meet the user's needs, so generally only air cooling mode or excessively low temperatures in winter season when there is better application. Generally, cooling capacity and fluid outlet temperature tube counterflow closed cooling tower depends mainly on three factors:
1, the tube side fluid inlet temperature. The higher the inlet temperature, the greater the cooling capacity; but generally not higher than 70 ℃.
2, the cooling air inlet mode and status. Evaporative cooling mode, the cooling capacity and the temperature of the fluid outlet tube closed cooling tower depends on the air inlet wet bulb temperature, low temperature difference between the outlet temperature with the wet bulb temperature is generally between 4.4-5.6 ℃; air-cooled models when the cooling capacity and tube fluid outlet temperature depends mainly on the closed cooling tower air inlet dry bulb temperature, the minimum outlet temperature difference with the dry-bulb temperature is generally between 11.1--13.9.
3, operating conditions. Including spray water spray density, air face velocity and flow rate of the fluid in the tube.
Among them, the first and the second factor depends on the environmental conditions of the target user runs the fluid cooling demand and closed cooling tower when. When the tube fluid inlet temperature is fixed, with the air inlet state, especially changes in temperature, the cooling capacity of closed cooling tower will be significantly changed. At this time, for the same time meet the user's needs and saving refrigeration economic goals, according to different climate temperatures, choose a different cooling mode, and while adjusting operating parameters, including: frequency of adjustment by adjusting the fan face velocity of purpose, or by adjustable spray water circulation pump power reaches adjust sprinkler water spray density of purpose, or by adjusting the pump power of the tube to adjust the tube fluid flow purposes.