I have considered different scenarios. Ice Load is considered only from jan to march. Before and after the building has a different pattern, which is more conventional.
Jan-Feb Scenario: 8000 people and 24W/m² lighting.
Rest of the year: 2500 people and 12W/m² lighting
I did some calcs, but still have some questions.
My convective heat negative heat load form Ice Track is 654kW. In the same passage in ASHRAE book of refrigeration (Page 34.2), there are some other loads of which radiant seems to be applicable in this situation. There will be radiant loss from...
Thnx. I will check with the referigeration guys.
Certain other losses come to mind:
-Radiation loss due to temperature difference
-Sublimation (evaporation directly frmo ice)
Thanks MintJulep,
My Total cooling is 2700kW, 1800kW of which is sensible.
So with U=8.33 W/m².°C (RSI=0.12 m².K/W)
I get:
Q=(8.33 W/m².°C)x(5000 m²)x(24° TD)/(1000 W/kW)
= 1000 kW
This seems huge.
I am designing an ice rink. There is a race track in a stadium (Oval) which is made of materials which has high U-values (blacked out good glass as walls). I have calculated the cooling load, which is quite high as expected. What I have not incorporated is the effect the chunk of ice on the ice...
Thanks GMcD, CountOlaf and Lilliput1 for the helpful information. Here is my feedback.
Why Burry?
We always design chilled water and all the other piping under the raised floor, with all the bells and whistles – leak detectors (Liebert Liquitechs) and lek-tec water detection loop around the...
I am desigining a Computer Room with raised floor and suspended ceiling. I was thinking of running chilled water piping (supply and return from Chiller) underground (buried). The reason is I want to minimize the risk of flooding and avoid running it under raised floor.
This is in London...
Tegger:
Have you checked if the unit can deliver 35% OA. This is on the extremes. I once ran into a problem just saying that on the drawings, but the model I specified could not do it. Big Mistake. It was a high density small restaurant and I had to increase the make up air fan to accomodate...
mass flow in will be equal to mass out. Very true.
But with increase in static the blower will reduce its intake cfm, thus lowering its exhaust.
How much you will get at the end of the duct?
1. Calculate total static
2. Read fan curves and read the cfm against the calculated static loss on...
ChrisCloney:
I think you would not worry about putting more ventilation if the photcopier is a new type. The older models exhumed fumes and needed some ventilation (exhaust over the photcopier). The new ones just are an added heat load in the room. 20cfm for a person is good for ventilation...
pedarrin:
I agree that Plumbing is the ignored part in a Mechanical Engineer’s agenda. It is sad, but this is the way it is.
The industry responds the same way. There are far less design guidelines for the plumbing design available today. I personally have hunted in vain for literature, which...
Thanks Madvb,
I have those ductulators and the software. McQuay has these as tools on their web site - they have small programs for more than just ducts.
I am looking for a more extensive program, where I can put in the whole layout, change it if and when needed, and get all the pressure...
Hi,
I am contemplating to buy a duct sizing program. I am evaluating various programs, but it is hard to make a decision. Elite has DUCTSIZE, which I think will suit my requirements. I want to hear from you if you have any experience with it. OR for that matter which one do you use and how do...
Hi Zemela,
I think for commercial kitchen the appropriate cfm per sqft is between 80 and 50 (ASHRAE - Industrial Ventilation). Arabei's figure seems too high, which will always require an extra make-up air unit for high volumes of exhaust - something which can be avoided in small hoods.
Vic
