Among the closed cooling tower parameters, the water consumption of the closed cooling tower is 0.5-1%, the water flow rate is 0.01, and the water consumption of the open cooling tower is 4-5%.
1. Calculation of cooling water volume of closed cooling tower:
Calculation formula: W = Q/[C(Tw1-Tw2)].
In the above formula, Q represents the heat discharge of closed cooling tower, and the unit is kw. If it is applied to compressor calculation, we usually use about 1.3 times of compression refrigerator. For absorption refrigerator calculation, we usually use about 2.5 times of refrigerator load. C represents the specific heat of regular water, which is at normal temperature and in natural environment, the value of C is 4.1868kj/(kg ℃),(Tw1-Tw2) is the temperature difference between the inlet and outlet water of the representative closed cooling tower, tw1 is the inlet water temperature, tw2 is the outlet water temperature, in the regular environment, the cooling machine of the compression cooling tower is 4-5 ℃, and the absorption refrigerator is 6-9 ℃.
2. Calculation of water replenishment of closed cooling tower:
Closed cooling tower and open cooling tower of the amount of water is different.
2.1 the amount of water added to the open cooling tower: the amount of water added to the open cooling tower should be the same as the loss, because the cooling water will be directly cooled as spray water in the open cooling tower, so the loss of water is relatively large, mainly concentrated in the loss of water evaporation, water flow and sewage loss.
2.2 Closed Cooling Tower Water Replenishment: Due to the two-cycle design of the closed cooling tower, the cooling water circulation is closed inside the pipeline, so the loss of cooling water is 0.01, which can be ignored, and the cooling water is pure water, and pure water must be supplemented, while the main water loss of the closed cooling tower is the evaporation of spray water, which we supplement according to 1% of the water consumption.
Cooling tower cooling water supplement is supplemented according to the percentage of circulating water, in individual industries, such as centrifugal chillers, the percentage of cooling water supplement is 1.53, and the percentage of water supplement for lithium bromide absorption chillers is 2.08.
3. Determination of head of cooling water pump:
Calculation formula: Hp = H1 H2 H3 H4 H5.
In the above formula, H1 represents the total friction of the cooling water circulation pipeline, the unit is mH2O,h2 represents the total local friction of the cooling water pipeline, h3 represents the resistance of the cooling coil, h4 represents the horizontal vertical height of the cooling circulating water, and h5 represents the spray pressure of the closed cooling tower, which is calculated according to the constant 5mH2O.
Closed cooling tower in different industries application and design selection, some industries will be applied to the special regular parameters, so according to the actual situation, the amount of cooling water and the amount of water to calculate the cooling tower.
The outdoor temperature in summer is very hot, which has a certain influence on the cooling effect of the glass fiber reinforced plastic cooling tower. Today, I will introduce to you how to cool the cooling tower in summer:.
Cold width = T upper tower-T out tower.
Cold amplitude height = T upper tower-T wet bulb.
Tower efficiency = cold width/cold height.
High temperature and high humidity in summer will lead to a decrease in the efficiency of the cooling tower, and the approximation of the return water temperature and the wet bulb temperature will increase, that is, the cooling effect is not good.
Supplement: The ideal cooling temperature (that is, the return water temperature) of the cooling tower is not the temperature at that time, nor the wet bulb temperature, but 2-3 ℃ higher than the wet bulb temperature. This value is also called "approximation degree". The smaller the approximation degree, the better the cooling effect. It is wrong to "if T wet bulb is very efficient, the higher the return water temperature, and the molecules in the formula will become smaller accordingly. In short, high temperature affects the efficiency of the cooling tower.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time waiting for complete procedures