2、 Design performance parameters of DHTA series products:
According to the provisions of GB7190.1-1997, the design wet bulb temperature of a standard type cooling water tower is 28 ℃. Generally speaking, a cooling water tower designed based on a wet bulb temperature of 27 ℃ can be used normally in northern areas with good ventilation and no other special environmental microclimate. However, the feedback information collected over the years on the operation effect of the cooling water tower indicates that under humid and hot climate conditions in some southern areas or some areas with poor ventilation In buildings prone to forming a high-temperature environment and microclimate, the cooling water tower designed based on a wet bulb temperature of 28 ℃ exhibits excellent heat dissipation effects and extraordinary resilience, providing designers, installers, and users with a reassuring confidence.
The DHT series cooling water tower of Daheda has decided to adopt a temperature of 28 ℃ as the design condition in the process of continuously summarizing experience and improving the water tower technology to ensure the high quality of the water tower.
DHT series standard, high-temperature, ultra-low noise design conditions:
Inlet water temperature 37 ℃ Outlet water temperature 32 ℃
Wet bulb temperature 28 ℃ Dry bulb temperature 31.8 ℃
3、 Performance introduction of DHTA series cooling water towers:
1. Overall effect:
Cooling water tower theory is a highly comprehensive and experimental system discipline. Based on years of thermal testing and testing of cooling towers, the company's technical personnel comprehensively and comprehensively processed the test data, and based on the OWADA (35 × 20-75 °) trapezoidal wave water filler volumetric mass dispersion coefficient Β Xv, select the optimal air-water ratio, optimal cross-sectional water load, cross-sectional air load, and height range of packing efficiency to determine the packing volume, and comprehensively design the appearance and structure of the tower from a hydrodynamics perspective. Estimate the ventilation resistance based on testing. Refer to the fan characteristic curve and test data to optimize the selection of fans and matching motors that meet the air volume requirements and noise standards, so as to achieve cooling efficiency, energy consumption, noise The appearance achieves an optimized system effect.
2. Structural features:
A. Packing: DHTA series standard type, high-temperature type, ultra-low noise type cooling tower packing is made of modified PVC (polyvinyl chloride) flat sheets by hot rolling molding. The function of the water pouring packing is to disperse the hot water that needs to be cooled into water droplets and form a water film, to increase the contact area and contact time of water and air, that is, to increase the heat exchange strength of water and air. The cooling process of water is mainly carried out in the water pouring filler, where heat and mass exchange occurs between water and air. The cooling effect of a cooling tower largely depends on the heat exchange performance of the water pouring filler. The water pouring filler with good performance has a high heat dissipation ability. The plate structure of the filler and the rhombus peak (35 × The design advantages of trapezoidal wave drenching filler (20-75 °) include:
1. The growth coefficient of heat dissipation area is large.
2. The distribution performance of water flow on the board surface is good.
3. Water and air have a large disturbance when flowing through the plate surface.
The above advantages enable the DHT series cooling towers of Yamada to achieve higher heat dissipation performance.
B. Fan performance: Through comparative tests, DHTA series cooling tower fans are selected as special fans for low speed space twisted forward tilting aluminum alloy cooling towers. This fan product can fully ensure that the air volume, air pressure, noise, water float level, and operating performance of the cooling tower meet the technical requirements under various operating conditions. Its performance characteristics include:
1. The fan blade is made of aluminum alloy plate, and the angle of fan with unit number>12 # can be adjusted. When the season changes, the blade installation angle can be changed to adjust the air volume and pressure, to improve the efficiency of the device and achieve the purpose of energy conservation.
2. The fan adopts a large chord length, spatial distortion, forward tilting blade type, and low rotational speed drive, achieving the effects of uniform wind speed at the air outlet, large air volume, high efficiency, low noise, and low power consumption.
3. The blades have been tested for balance, with a balance accuracy of ISO-2.5.
C. Performance of water distribution part:
The function of the water distribution system is to evenly splash hot water onto the entire drenching filler. The performance of the water distribution directly affects the uniformity of air distribution and the ability of the filler to play a cooling role. Daheda DHTA series cooling towers use a rotary tube type water distributor, which uses the reaction force of the water sprayed from the water distribution orifice on the sprinkler throat to drive the water distribution pipe to rotate, so that the surface of the water spraying filler is alternately and evenly distributed. The advantages of using this water distribution method are:
1. Low water supply pressure, energy saving.
2. Good water distribution uniformity.
3. A water baffle is installed on the water pipe, which has a certain role in promoting uniform water distribution and eliminating floating water. The swivel part of the water distributor is made of copper alloy, with compact structure, high strength, and no rust. After practical testing, this type of water distributor has low failures and stable performance.
D. Tower structure and performance:
The tower body of the water tower is made of high-quality fiberglass reinforced plastic material, and its surface gel coat is made of imported raw materials. The color seed contains U.V.S light stabilizer to make it bright and uniform in color, not easy to fade, aging resistant, and shiny over time. All steel structural components are subject to hot galvanizing treatment. A large number of injection molded components are used, which are corrosion resistant, high strength, light weight, good versatility, and easy to assemble.
The design of the DHTA series cooling water tower in Dahota successfully controlled the problem of floating water, with a loss of less than 0.001%. The measures are as follows:
1. Try to use low speed fans to avoid excessive water mist being brought into the air.
2. A waterproof sleeve is provided on the water distribution pipe to collect scattered water droplets.
3. The bottom basin is designed to be larger than the shell diameter, and a P.V.C. air inlet shutter is installed, effectively preventing water from splashing out of the tower.
Low noise, using noise control principles:
1. Reduce the noise of the sound source. The fully enclosed self cooling low noise cooling tower special motor is adopted, which has good waterproof performance and low noise, and can meet the special requirements of the cooling tower operating conditions on the motor.
2. Isolate the noise propagation path.
3. Protective measures for the receiver.
Changing the previous way of isolating noise, which is to treat symptoms rather than root causes. DHT uses a combination of the two to treat both symptoms and symptoms. The enclosure, air inlet network, and muffler utilize the principle of acoustic reflection to achieve sound insulation purposes.
DHTA series ultra low noise cooling water towers in Daheda are made of extremely soft and elastic organic polymer materials, which have excellent sound attenuation effect, good water permeability, corrosion resistance, and durability.
If you are interested in the DHTA series industrial cooling water towers of Dahota and want to learn more detailed product information, please contact Dahota directly!