Heat Exchanger formula for Telecom Cabinet

[Engineer316]

Hi Guys,

I have received this project for a telecommunication company
I want to design a heat exchanger for a telecom cabinet.
I'm trying to come up with the right formula that can result in a specific cooling capacity (W/K)
Besides cooling capacity (W/K) , I have researched about the factors that are needed in a heat exchanger system such as; heat dissipation (W), Temperature Difference (Delta T in C), Surface area of heat exchanger core (m²), and the fan airflow (cfm).

However, I'm still looking for the right formula to arrange all the factors above.
For example ; if I want to have a heat exchanger system with 150W/K cooling capacity, how big should be my airflow, or how big should be the dimension of my core etc.

Anyway, Thanks for your time and hopefully your expertise can help me.

 

[Tunalover]

What does the unit "K" represent? Degrees Kelvin?


Tunalover

 

[IRstuff]

K is the symbol for kelvin, the thermodynamic unit of temperature; "degree" is not part of the unit name

I suggest that the OP do some more research, as the question is insufficiently parameterized, i.e., what are the parameters of this cabinet? You start with the power dissipation of the cabinet and the allowable temperature rise; you do not start with the exchanger.

TTFN
faq731-376

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Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[chicopee]

If I Understand your project, you have cooling fins, as a HX, in a telecom. cabinet, and you are blowing cool air over the cooling fins, is that correct?

 

[telecomguy]

I agree with IRStuff that there are just way too many variables to take into consideration before being able to just plug-and-chug a solution.

A typical HX for telecom applications is air-to-air with fans on both the inner and outer loop. Often the fans are the same but it's not uncommon to run across two different fans. Reason for this is the outer fan requires a salt fog test compliant fan. The inner fan is not exposed to the outdoor climate and you can use a less expensive fan. Also, when installed near a residential area, it may be desirable to put a speed controlled fan on the outer loop. This helps to reduce noise pollution (ie. angry neighbors). This reduces the efficiency of the HX but during the quiet hours at night, it is usually not necessary for the outer fan to run full speed since the outdoor temperatures drop at night.

Are you looking at a cross-flow core? Parallel flow? Counter flow?

-tg

http://xternal.me

 

[willard3]

You should hire an Engineer who does this or look for help in your office if it is available.