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Posts tagged with 'HVAC'

19 May, 2011

John Wilson Welcome to Part III of a multi-part series, where in this installment Travis takes a “virtual” look at his crawlspace. For this next installment of “this old CFD house”, and really the entire reason I started this blog series, I’d like to take a look in my crawlspace. Now, from what I understand, Feng Shui says running water is good for wealth. Well the opposite is true when you have a … Read More

crawlspace, CFD, HVAC, FloVENT, humidity

29 Mar, 2011

John Wilson Welcome to Part II of a multi-part series where, in this installment, Travis takes a look at a typical chimney. For this next installment of “this old CFD house”, I’d like to investigate another gremlin that was discovered during the inspection period of the house we are purchasing. This one related to the chimney. The current damper is rusted and hard to operate. According to the chimney expert we … Read More

Chimney, CFD, HVAC, efficiency, FloVENT

10 Feb, 2011

John Wilson I’d like to introduce my first guest blogger, Travis Mikjaniec. Travis is a colleague of mine who is entering the world of home ownership. Travis has questioned some of the recommendations from the various home inspectors. In a multi-part series Travis will debunk or otherwise quantify the value of the recommendations. Starting the process of buying a house is a daunting task.  Beyond all the … Read More

Duct Flow, CFD, FloVENT, HVAC

8 Feb, 2011

Boris Marovic Hi again, I recently came across an interesting HVAC application of FloEFD, our CAD-embedded CFD package for concurrent product design, from one of our users in the Netherlands, Royal Boon Edam. I think it just shows how ubiquitous CFD has become in the world today when a manufacturer that was founded in 1873 as a carpentry workshop and has now grown into an international leader in the design and development … Read More

CFD, Bob Dylan, Revolving Doors, Royal Boon Edam, HEC (Holland Engineerings Consultants BV), HVAC

31 Jan, 2011

Robin Bornoff The recently released FloEFD HVAC Module brings a raft of features specifically tailored to enable FloEFD to be used for built environment simulations. FloEFD  has an unrivalled pedigree in the automating of advance CFD (computational fluid dynamics) techniques and capabilities, allowing the user to focus on application and not numerics. This democratisation of CFD brings the ability to simulate the … Read More

FloEFD HVAC Module, FloVENT, HVAC

29 Oct, 2010

Robin Bornoff On a recent trip to Japan I was surprised to find out how much their attitudes to smoking had changed. Cigarette prices have increased by over 30% in the last year and many public places now have smoking bans in force. For a country that has been renowned for its voracious attitude to smoking such a change in such a conservative culture is a bit of a shock. But as they say nowadays, “smoking is … Read More

contaminant distribution, FloVENT, CFD, HVAC, smoking

16 Sep, 2010

Nazita Saye A couple of months ago I visited my colleagues in Budapest. During my stay, I was invited to take a tour of a local university where we visited an engineering studies building.  We ended up in a lab to see some equipment. As soon as I walked in, I got distracted because of the temperature in the lab. Why? Because we were visiting Budapest in the middle of a heat wave (it was about 38° celcius, 100° … Read More

Energy, HVAC, chill beam, UNC at Chapel Hill

10 Aug, 2010

Robin Bornoff The internet is big. It’s not sentient yet, though Robert Swayer has written a compelling story of how it might ‘Wake‘. In fact it’s far from intelligent at all. Banal comments about “how we ever managed without it” will age so quickly that future historians will assume a typo, more intelligence than we currently have and take the phrase to have been “how did we ever manage with it”. It looks like … Read More

data center cooling, data centre, Data Center, FloVENT, HVAC, data centre cooling

7 Apr, 2010

Robin Bornoff Larry Grayson’s famous high camp catchphrase would be well heeded by those wanting to ensure good thermal insulation. You can make it difficult for heat to leave a room, thus maintain a warm room temperature, by constructing walls and floors of sandwiched layers of various materials, restricting heat transfer to conduction and (in cavities) radiation methods only. Open a door however and cold air will … Read More

FloVENT, HVAC, CFD, Thermal Insulation, U-Value

12 Mar, 2010

Robin Bornoff Conduction, the transfer of heat through a solid object. Convection, the transfer of heat in moving air/fluid. Radiation, the transfer of heat from one solid surface to cooler solid surface in ‘line of sight’. The 3 modes of heat transfer are your enemy when it comes to thermal insulation of built environments. Heat is as sly as a fox when it comes to squirming its way out of a space to the cool outside. … Read More

HVAC, Thermal Insulation, FloVENT, U-Value, Watts

2 Mar, 2010

Robin Bornoff Why is it that when you increase a cavity air gap size beyond ~30mm is there no subsequent detrimental affect on the overall U-Value? Why is it that the U-Value of the cavity gap nearly doubles when the air gap reduces to such as size so as to stagnate the air? Questions that come begging after observing the FloVENT simulation results discussed in the previous blog posting. Let’s find out…. When I … Read More

Conduction, Convection, CFD, U-Value, FloVENT, HVAC

17 Feb, 2010

Robin Bornoff 100mm block, 50mm insulation, 50mm cavity air gap then 100mm block make up an external wall that in theory comply with a building regulation overall wall U-Value of 0.3 (W/m^2K). This got me thinking about the 50mm air gap. Why 50mm? What if it was 75mm or 10mm? Stagnant air is a great insulator, a small gap would tend to stagnate the air and might improve, reduce, the overall U-Value. A large gap would … Read More

CFD, FloVENT, Cavity Wall, HVAC, U-Value

5 Feb, 2010

Robin Bornoff As covered in the previous blog, air that sticks to the inside and outside walls offers a resistance to the heat that passes from the room to the inside of the wall and from the outside of the wall to the outside air. These two resistances make up part of the overall U-value, the overall ease by which heat can pass through the entire wall (or window or door etc.). The rest of the U-value is made up … Read More

FloVENT, HVAC, Boundry

2 Feb, 2010

Robin Bornoff It might well be that a single U-value is quoted, in reality though that single value describes the ease by which heat can pass through various stages, from an ‘inside’, passing through a ‘wall/window’ and going to the ‘outside’. The resistance (inverse of the ease, resistance = 1/ease) the heat experiences as it passes from the inside air to the inner solid surface of the wall construction (and from … Read More

FloVENT, HVAC, Boundry Layer, Thermal Insulation, U-Value

29 Jan, 2010

Robin Bornoff I never trust a quoted value without having at least a little understanding as to what the value truly represents and how it was measured or derived. If you’ve ever felt inferior when someone quotes values or ranges of values at you take solace in the fact that there’s a fair chance they live on the surface of the pond of understanding and really don’t know how deep that pond is. To see a value, be … Read More

HVAC, K, DegC, U-Value, Watts

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