Hello I need some help with a heat exchanger calculations.
A counterflow H Ex uses combustion gases to heat air for a process.
The data T1 in(air)= 25C , T3 in (gases)=180C and T4 out (gases)= 85C
air mass flow= 1 kg/s, gases m= 1.8 kg/s
The combustion gases lose heat to the environment by 5...
Anybody that could help me to learn some basic design principles for electric kilns?
I need to determine KW input required for a specific volume in ft3 , I think Im having some difficulty understanding radiation.
I just have a space volume ( 15 x 7 x 3 mts) and a delta T 5 to 40 C how to...
Hi all,
I would like to ask why is that in the outside air design conditions for winter there are not included the wet bulb temperature or relative humidity as in summer? In summer with dry and wet bulb temps i go easily to my psychrometrics software and compute some data but for winter I just...
Hi there,
I was reading some theory of evaporative cooling equipment and learned that water requires sensible heat from air to evaporate (heat converted to latent heat).
My questions are, for a cold weather with low RH like for instance 17.6 F db, 51% RH is it still possible for water to...
Hi guys,
Is there a specific formula to calculate the area of chimney needed to exhaust flue gases from a x BTU/hr gas heater?
If i need to provide more imformation please advice.
Thanks,
S
Hello there,
I have a space that requires 2000 cfms according to room volume and air changes per hour but when I calculate the sensible plus latent loads 10 TR are required.
The rule of thumb is 400 cfm per ton so how does this work? what is the logic of this? 10 tons would be 4000 cfm or...
Hello everyone,
I have the following problem, outside air x conditions and its required 90% return air and 10% outside air to heat a building.
Is there a rule of thumb on what conditions to consider for indoor air( return) to calculate the mix?
I need to determine the BTU/hr required and need...
All,
How to calculate the temperature of air at a certain distance from a heating panel?
I have a temperature in the Nichrome wires of the heating elements and the emissivity.
Im trying to heat a part but need to determine the distance from the panel, how the air temperature decreases with...
In order to determine the right size of a heater for an evaporative air cooler I have two cases:
1. 100% fresh air
2. Air mix, 70% Return air, 30% Fresh air
For 1 I get X KW´s
For 2 I get Y KW´s
X=Y , X>Y or X<Y and why?
Thanks,
