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What are the advantages of Induced Draft Cooling Towers over Natural Draft Cooling Towers?
Wiki User
∙ 13y ago
From your query, i am assuming the same for Power Plant Condenser Cooling and also for TG & Boiler auxiliary cooling.
If you take this case, for both the cases you need huge quantity of water. It will be re-circulating..
Now, coming back to your query. Since the hot water return from the eqpts are at high temperature, it will be cooled in the tower. In the case of Natural draft, as the name indicates, the water is cooled by air naturally. For this purpose, to create the reqd. draft, huge, lofty RCC (Reinforced Cement & Concrete) parabolic structure needs to be constructed. The ht. of the structure will vary from 40m to 120m and dia will vary from 60m to 100m depending upon the design, water in circulation, ambient conditions etc. So, this involves huge construction work, high capital investment and take long time to complete the activity, more resources. However, when comparing the entire re-circulating system with both ND as well as in ID, the payback period will be to the tune of 5-6 years.
For IDCT (Induced), the draft is induced by means of a fan placed on top. Hence, the size of the structure, height wise is less whereas foot print is more but is lesser than ND towers. Here, the capex or capital investment is much lesser (Almost by 20%) than ND. However, due to the presence of a fan, there is a recurring running cost. Here the power requirement is higher (By 1%) than ND.
In ND no fans are required (Hence no power).
While selecting the CT, you have to select depending on the reqmt which you are looking for. If u r willing to shell out cpital investement, you will have no recurring cost in terms of power consumption.
Similarly, maintenance wise, it is easy to access IDCT since it is not a tall structure. But maintenance will be more in ID as it has moving/ rotating parts.
Duration of construction is also less for IDCT. Civil works is less.
Hope this is useful
Regards,
R. Veda Siddharth
Wiki User
∙ 13y ago
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Eddy current dynamometer?
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What has the author W S Norman written?
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When a project is originally designed, the designer must decide whether a natural draft or mechanical draft tower offers the best economic result. Mechanical draft towers are substantially less costly to purchase, but have the disadvantage of having a continuous auxiliary power draw. They are also physically smaller and shorter. Natural draft towers consume no auxiliary power, but are very expensive to purchase and erect. They are very large and tall. Often times, plants do not have enough "real estate" to fit such a large structure. One must do an economic analysis to establish which option is the best choice, economically. They are also simpler, not having any moving parts
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AIr
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