Newbie’s guide: Issues with ventilator calculation and selection – urgent, seeking help!
Thread Content
The only colleague in the design office who worked on HVAC and plumbing systems has left, and the director passed on his unfinished work to me. Coming from a chemical engineering background, I have no knowledge of these things; now I can only build upon what he had already done, following his approach as a guide. Regarding the calculation and selection of ventilators, based on the operating conditions and building parameters, it was determined that the ventilation volume required for a certain distribution room is 4560 m3/h. The colleague who handled this task recommended the use of 2 axial flow ventilators with a ventilation capacity of 2400 m3/h each; the model number of these ventilators is 4, their shaft power is 0.09 kW, and they are equipped with YSF-5624 motors. Throughout this entire calculation process, I can determine the ventilation volume. By referring to the \"Practical Handbook for Fan Selection,\" I can find that fans used for industrial fire suppression and smoke extraction are usually axial-flow types. Given that the shaft power of the fan in question is 0.09 KW, the handbook also indicates that the appropriate motor model for use with it is YSF-5624. But mainly, how were the values of 2400 m3/h for air flow rate, 0.09 KW for shaft power, and machine model number 4 determined? I really don’t have enough time to research this on my own; I hope someone with expertise can provide detailed calculations along with the procedures for referring to relevant manuals. Thank you so much! The deadline is very tight, and I’m almost overwhelmed :L
In response to the request above, I spent a day thinking about it and came up with a few ideas: the selection of ventilators is determined by using the calculated ventilation volume and referring to the \"Practical Manual for Ventilator Selection.\" However, I identified two issues: First, the ventilation volume required for the factory is 29,232, and the design specifies the use of 6 units of type 5375. I wonder what the criteria are for determining the number of ventilators needed; for example, why not design the system using 4 units of type 7355 or 8 units of type 3753? II. When selecting the appropriate model, I went through the practical manual in detail to compare it with his selection results. At first, it seemed that it matched the commonly used T35-11 type axial flow fan, but later I found that he mentioned in another set of design specifications that we should use fiberglass fans. However, the \"Practical Manual for Fan Selection\" I had access to did not contain any information on fiberglass fans. So, in addition to the issues mentioned above, I would like to ask if anyone knows the standards related to fiberglass fans. Help!
I have worked on fiberglass reinforced plastic fans; there are standard specifications for them, but it seems I can’t upload them
There are certainly various options available for design selection; the key is to determine which one is the best. Sometimes it may not be possible to choose the optimal option, but it is essential to meet the requirements. Cases like the one you mentioned do exist; the choice of approach depends on factors such as the installation location of the fan. With a constant total air volume, 4 to 8 fans can be selected; however, if only 4 locations are suitable for installation, then 4 fans have to be chosen.