So I found a diagram on the manufacturers site that depicts the HW coil being served from the water heaters and the same water heaters serving domestic water. We just discussed it internally and decided to go without the reheat but this has served as a learning experience. I appreciate all the...
Thanks DRWeig
This is really conceptual at this point, I still have to go through and fixture out GPM etc. I am looking for a really small temperature rise and plan on delivering the air directly to the space.
Hi Everyone.
I am adding a chilled water outside air unit to a exisitng project. This unit will handle around 3500 CFM of outside air. The unit will be equipped with a hot water re-heat coil from the factory so all we need to do is get some hot water to it. The problem is that the only hot...
Hi everyone, im having a little difficulty and was trying to get some help.
I am looking for a relationship between color temperature (kelvin) and wavelength in nanometers. I have seen that there is a relationship called "Wien's Law" basically it is Wavelength (nM)=3,000,000/Temp (K). I have a...
Hi everyone. Im working on a large house in Pakistan. My load calculation program has weather data from just about every place in the world however it doesen't have any data for Pakistan. The closest I can get is somewhere fairly close in India. Can anyone help me out with this? I am looking for...
Agree to disagree. Infiltration is accounted for in my load calc but it is very little. A commercial building is required to have ventilation running continuously during occupied hours. That means that the building is positively pressurized already. This building is pretty air tight and the...
Yea, I have per ashrae 62.1 - 2004 but for this unit, it is a very small amount. There are only about 10 people that will occupy the space at a maximum. Ashrae 62.1-2004 says 5 CFM/ person + .06 the floor area. This equates to about 80 CFM of OSA. In this space I have large western windows...
Hello everyone. I wanted to get some opinions on this. We have a wood working/metal working shop that is part of a much larger building. The total shop area is about 1600 ft^2.
According to NFPA 664 chapter 1, standard 664 only applies to shops over 5,000 ft^2. Does this mean that if the shop...
Im not exactly sure how my program is calculating it. I wonder where I can go to find out which method it uses... This is an office with no internal latent gains except people. Also, the OSA requirement is very small.
There is virtually no infiltration in this building (2nd floor of a almost...
I am located in southern Florida so humidity is a huge issue. I usually won't use a outside air unit unless the designs requires it such as in a assembly occupancy or a dense hair salon.
I would say using the rule of thumb 400 CFM/ ton is just that, a rule of thumb but I wouldn't want to exceed...
Also, I typically use 0.1/100' for a smaller system, then 0.08/100' for a larger system. If I verify the ESP and it is too low or high, then I go back and do a little re-sizing.
I know some people like to try and make the static exactly equal to the CFM they are trying to achieve based on the...
One question, what is a "3 TR"? 3 ton?
I understand what you are saying, but if I selected a compressor based on the load, and a fan based on the CFM, the unit would have to produce well over 400 cfm/ton which isn't possible with DX equipment usually.
In my case, lets say I selected a 3.5 ton...
Realistic hypothetical: Lets say you are designing an office with DX split systems and the load calc comes to:
35,700 sensible btu/h
3,500 latent btu/h
39,200 Total.
This could probably be covered nicely by a nominal 3.5 ton system pretty nicely. Now lets say the cooling cfm required...
I really think they are just doing alterations and repairs here. Not really making jewelry. The existing shop has nothing in it. This new store is only 2000 ft^2 so I dont think industrial ventilation will be a very good fit.
I think I am just going to do a downdraft vent and a overhead exhaust...
Im working on a Jewelry store. Obviously the store part is pretty simple. Im just concerned about the backroom. The Jeweler stores a couple large tanks of oxygen that he uses for making jewelry, and also has a tank of acetylene. Im sure he uses these chemicals to weld, which means they are...
Like I said, this is a existing pizza oven. We are really trouble shooting it because there is smoke backing up into the kitchen. I dont have any literature on how these pizza ovens work. Obviously I am going to suggest the oven ducting be cleaned, but I am also concerned about pressure in the...
