I will use common objects to make this a bit more easy to ask. Lets say I have a medium sized enclosure (say a box that is around 3 feet by 2 feet by 2 feet).
I have a internal heat load (given) and I also have a internal temperature that I would like to maintain (Lets say it is 135F). So I...
I know the basics of convection and conducion. I am havign a bit of a hard time tryign to figure out how you determine an overall UA value for a space if you need to look at walls, ceilings and floors - I know how to find each UA value but I am confused as how to find the overall UA value...
How do you add UA values for a space if you have walls and a ceiling. I have a space and I have walls built up of several materials and a ceiling and then an air gap and a metal outter surface (call it a roof).
I know how to find the U values for the wall or the ceiling and therefore I can...
Ok so here is my problem. I have several pipes that are carying very hot compressed gas. Some of these pipes will be running near areas that are constructed of aluminum.
I want to make sure that I do not overheat the aluminum but before I go puttign a ton of inssulation on the pipe I woudl...
I understand what it is and how it is typicalyl measured. However I am not familiar with typical values are in correspondence with say the dry bulb temperature.
I am looking for a table with typical vaues that I could use to do some approximate analysis.
For example is there any data out...
I noticed on a trip out to Las Vegas that all of the residential areas have homes with what looks like the air conditioning unit located on the roof.
Are these air conditioning units that I am seeign on the roofs of the houses? If so why are they located there?
If not what are they? (Solar...
Here is a question I have been askign myself and I am not sure what the best answer is.
You have a system where the condenser section and the evaporator sections are located in different areas and have different fans and motors.
When you configure your evaporator layout is it better to place...
In the near future I will be tasked with analyzing a heating and air conditioning system. Part of that analysis is goign to include looking at the distribution system that is in existanance and tryign to determine the flow losses and thermal losses thru each of the branches of ductwork.
I have...
I have3 a strange situation and I don't even knwo whre to begin in terms of analysis. What I have is a fan that is suckign air out of a space thru a hole in the wall of the space.
However in that hole is a box that takes up most of the hole opening. Therfore I only have the space between...
I am looking for suggestions on what books or manuals I can purchase to teach me how to analyze flow in ducts (round and rectangular or other shapes).
I need to be able to look at a system and determine the flow losses and thermal losses. I am looking to figure out what the flow output will be...
Can anybody suggest some good books or manuals that can explain the basics of fluid dynamics. I have to admit that fluids was far from my favorit class in college. Now I have been out of college for 6 years and not used any fluids since school.
Currently I am working on projects that are HVAC...
I am trying to set up a program on excel to look at air conditioning loads and what not. In doing this I would liek to use equations and data fro mcharts as much as possiable so that I do nto need to reference the psychrometric chart - I want to keep the model I am building dynamic and easy to...
This may sound like a silly question but I have totally forgotten how to use the Psyh- chart to follow a air conditioning system problem.
For example if I start with an outdoor condition of 95 degrees F and 80% Relative Humidity and I mix that air with return air that is at 80 degrees F and 50%...
I have forgotten all the differences in flow thru a pipe. I need to know the differences in the types of flow in a pipe and how this affects pressures, nozzles, ect.
My fluid would be compressed air at 350F to 650F with pressure ranges around 130psi
