Hi illhip,
A simple solution is to install paddle or ducted ceiling fans to bring the warm air down to floor level.
As a rule of thumb, air temp. increases by 0.5 F for each foot of height above the thermostat level.
Savings from destratification vary according to the type of facility and the...
Hi Sjung, for local application, the distribution varies with the application you are dealing with, but for total flooding ther are common rules of thumb, i'll try to brief them here below,
For total flooding applications distribute the discharge nozzles based upon the following two...
Hi all,
I'm really confused about how to select a jockey pump, and i mean in terms of flow.
I would dearly appreciate if any one can give me some refrenced info. about this subject Or how to predict the expected leakage rates in a conventional commercial system.
Hi puertorico,
You must know that the value of cfm/TR varies with the application and the region, the figure you use in England for one application you can't use in Dubai for the same application.
This figure also depends on your refrigeration equipment,
ie. the rule of thumb for DX...
Hi Zemela,
Typically for Kitchens the ventilation rate required is 10-15 ACH (air changes per hour) if you are talking about a domestic kitchen, but if we were talking about an industrial one the ventilation rate is 20 ACH.
But please note that, if you had a hood,
(it needs 150 cfm/sqft of...
Hi all,
I was wondering does any one have an idea about the ventilation and air conditioning requirments of the APM's tunnel and station or if there's a reliable source of information concerning this subject.
Hi pipe design, below is an article that i've found once i surfing the web in one of those precious moments that you can get sometime for yourself.
Practical Guide to Multi-split Systems and Variable Refrigerant Volume (VRV) Systems
by Mike Hardy...
so, do i understand that you're aganist using VFD's in both the primary and secondary loops. I was just trying to imagine how would the system perform, i thought for a while that the VFD's on the primary loop will feel the demand of the secondary loop (which is a higher gpm), but i think it's...
Hi KenRad,
I'm trying to solve a problem in a new design. But what really concerns me is the whole idea of both the primary & secondary loops having VFD's.
Hi all,
I was wondering about the possibility of using VFD's with the primary & secondary loops (ie. not the fomous discussion about P-only Vs. P-S systems), and if the primary and secondary loops have different delta T and accordingly the secondary loop has a gpm greater than that of the...
I think the moct critical issue is the exposure to lead that's why the shooting ranges are considered lead in air applications.
These are sum of the NIOSH recommendations, i hope they'll help
To reduce exposures to lead the following recommendations are offered:
1. The uniformity of downrange...
Hi Vicsidhu, hang on it's a very long way to go, and it seems that you're the person for it with your great will to learn. anyways, you must look at the issue from the point of how the fan functions to perform it's duty.
There's the thermal load of the system that the fan must deliver the...
Thank you PacificSteve now we're starting to get to the point. So it's now the time to consider the coparison application wise, and i mean chilled water systems Vs VRV systems (or VRF systems).
If any one could manage to compare in a pros and cons technique, it would be of a great help.
Sorry, i didn't make myself clear. Ofcourse i know the difference bet. both systems, but i need your help to make a complete comparison (ie. from the economic point of view or for which applications one supperiors the other).
I think this is the time that this question should be made clear, now...
