Ventilation Definition and 31 Threads

Hello, I have question about vent for tube that is 5" in diameter and 160ft long. Could 5" vent push/extract air to/from tube above? If possible, how much CFM should vent have? Thx 😊

Hello, I am currently designing and building a small utility vault to house a centrifugal pump for a water fountain, and I am specifically concerned with providing adequate ventilation not only during operation but also in general to reduce moisture and corrosion of the equipment. While all of...

• I exhale 1 kg of CO2 per 24 hours = 41.67g/h (average) • Co2 indoors after ventilation = outdoors = 400 ppm (world average) • Co2 indoors threshold = 1000 ppm (cognitive effect) • Room volume = 32.5 m3 • Details to neglect: window and door closed tight, no HVAC system or other ventilation...

From: https://www.cell.com/med/fulltext/S2666-6340%2821%2900153-7?utm_source=EA Blood oxygenation through the lower intestinal tract is demonstrated in both mice and pigs. It is hoped this wiil work for those Humans that need temporary assistance with respiratory function. Inspired by...

Welcome to PF! I'm an HVAC engineer and I actually gave a talk/round-table with the founder of your organization a few years ago: https://www.westchesterbiotechproject.org/innovation-in-research-2017 One factoid I give on labs that speaks to what people know is that a single 8' constant volume...

I'm still trying to understand the operation of these fans. How does the geometry downstream influence the flow. Specifically, there is an 8" ventilation tube in the ceiling of my warehouse. I'm thinking that I can extend it until it is 3/4 of the way to the floor. If I crack open an overhead...

Unflued gas appliances emit all of their combustion products into the room in which they are installed. In the UK, ambient carbon dioxide in the commercial workplace is limited to 2800 ppm. The UK/European standard BS EN 13410 (and many appliance manufacturers) give the formula for mechanical...

:warning: Sigh. Yet another hazard to worry about. You can just order a 3D printer online, plug it in, and start using it. But you shouldn't do that until you provide adequate ventilation.https://www.zdnet.com/article/volatile-compounds-3d-printing-has-a-serious-safety-problem/

Hi All, I am trying to find out how much CO2 (ppm) would be released into a ventilated room (m3) from a faulty pressurized gas cylinder to calculate risk associated. Would anyone be able to help me with a formula? I was trying to work with V=nRT/P but wasn't sure how do I translate the outcome...

I'm making a ventilation system with a fan that will blow air through a 1700mm long pipe that has a 45 degree bent in the middle. I should decide on a pipe diameter of 125mm or 160mm. Also I need to choose between 3 different fans that has the following specs from the manufacturer: 120mm fan...

Hi every body, I need help to calculate the pressure drop to double wall pipe with information as below, i understand need calculate pressure loss to the straight pipe, elbows and supports but I don't know exactly how. - Fluid : air - Double wall pipe (stainless steel) with outer pipe...

Hi , I'm new to CFD. I'm modeling a parking ventilation system in ansys CFX. I'm having some trouble modeling the jet fans . I went as follows. I created a fresh air inlet (Opening BC), an exhuast outlet (outlet BC) and in the middle I distributed jet fans .The jet fans are modeled as sub...

Hello all, This is the situation: a pipe, shown in de drawing below, is lifted at a constant speed of 1m/min. The pipe is closed at the top and open at the bottom. For obvious reasons, a ventilation hole is required at the top. The intention is to lift a minimum amount of water, in other words...

Hello, I am wondering what will happen if I try to ventilate a room by natural ventilation through a single opening. In this opening there will be a ventilation grill. I already found a paper about counterflow through an open door by temperature differences...

Hey, Could someone please help me find a comprehensive source that might tell me anything about the functions of the following Labs (These Labs are found in an agricultural laboratory) Preparation room Mixer's Room Stability Analysis Lab Mineral Analysis Lab Chemical Storage Blood Analysis Lab...

Hello all, this is my first post here, so please excuse me if there are any mistakes or important information is left omitted. Now, my problem is quite intricate and specific so I will be thankful for any information I can get. Using Excel, I am looking to model the volume flow of air through...

Here is the real life problem I am facing: Gas reciprocating engine is situated in an engine room. The engine is primarily cooled by jacket water flowing to remote radiator. The engine surface must also be cooled by forced convection to maintain max air inlet temp of 40C. Ambient can reach as...

Hi All, I'm designing an exhaust system in brewery. Does anyone know the recommended air changes (ventilation rate)? My concern is the elevated level of carbon dioxide during the fermentation process. I'm planing on exhausting the air thru sidewall propeller fans and make-up the air thru roof...

Hi all; an easy question for you. In the following picture, what is the ventilation box in the corner near the floor? Is there a particular name for these things? I see them everywhere. http://upload.wikimedia.org/wikipedia/commons/7/76/Duracraft_pedestal_fan.jpg Thanks!

hello fellow engineers! i just started work at a marine company and was assigned to investigate on this formula. it is from ISO 8861 and used to caculate the airflow needed for heat evacuation in a engine room. this is the formula, airflow needed = (heat emitted from engine and all other...

This is something that came up at work, as there are four computers running with their air vents placed four to six inches away from the air suction (so that it would suck up the air which was blown out from the air vent fan of a PC.) While this may seem like a good idea on paper (as the suction...

Homework Statement There are two storage rooms, (A) and (B) connected by a single doorway. Only room (B) has an outward vent, so all air exiting the rooms does so through this vent in room (B). The ventilator you will install drives outside air (78% nitrogen) at a certain flow rate through a...

I'm looking at a vent that will be used to prevent a tank from collapsing due to vacuum pressures in a pipe burst/free drain scenario. The situation would be a container is filled with water when an inlet or an outlet pipe bursts. The water flowing out would create some pressure in the tank...

Any of you HVAC guys/gals design a Displacement Ventilation (DV) system in the Northeast USA? With our heating requirements as a notable concern, is DV a viable option for very many applications in the NE USA (DE, NJ, PA areas). It looks interesting to me especially for cooling, but I...

Ventilation (concept problem), please help We breathe more fiercely when we do vigorous exercise. But what is the reason behind? (1) The medulla oblongata senses the increase in blood CO2 concentration. (2) The receptors in our skeletal muscles send nerve impulses to the brain. My...

How is ventilation maintained in Power Panels. Are there air ducts, at the sides etc. I haven't seen any exhaust fan mechanism as such on any Power Panels.

Hi all, I need to know if I'm on the right track with my thinking. I've drawn a diagram that hopefully is not too simplistic and shows what I am getting at. One of these links should work. http://www.roofersreview.com/d/9390-2/Hip+roof+diagram+calc_+copy.jpg...

Hi...Prbably a stupid question but here it goes: I have some equations here, some of them have a G for rate of generation and others have E for rate of evaporation (both of them have units of volume per time). My question is: if I know that I have 3 galons of a chemical at the beggining of...

I want to calculate how much effect in Watts a ventilation system brings into a room. Will it be correct to use the following equation for this: \dot Q = \dot V \cdot 0,335 \cdot \left( {T_A - T_O } \right) where 0,335 is actually the Cp of air derived from {{1005} \over {3600}} \cdot...

How to calculate the air needed to cool the engine room and maintanin the temperature not to exceed 120F( for marine duty)with 2 engines of 1401bhp and 2-generator sets. What factors should i consider? i thought of taking the engineer room volume, heat dissipation from the engine and air intake...

The flow of water and ventilation system in fish is 1 way, where as in mamals the flow of gases is in 2 ways. why is this?