Air flow and cooling capacity

[jamo1989]

Does cooling capacity increase with increased air flow?

[frank]

Short answer is no.

[vijay_study]

Hi, room sensible heat = 1.08 x cfm x delta t.
So if all parameters are kept constant then increase in cfm will increase the cooling capacity.

[The Viking]

Sorry Vijay,

If the energy input and efficiency is constant wouldn't the delta T change depending on airflow?

:cool:

[vijay_study]

Hi,

Rsh = 1.08 x 1000 cfm x 10 delta t
Rsh = 10800Btu/he

Rsh = 1.08 x 2000cfm x 10 delta t
Rsh = 21600 But/hr.

So if we increase cfm, cooling capacity increases.

Vijay

[The Viking]

OK,
But what if you only got a 10800Btu unit feeding the indoor coil?

Similary, what happens to the delta T if you got 21600 Btu unit feeding a 10800 Btu coil?

Surely the delta T can't be seen as a constant???

:cool:

[chemi-cool]

Hi,

Rsh = 1.08 x 1000 cfm x 10 delta t
Rsh = 10800Btu/he

Rsh = 1.08 x 2000cfm x 10 delta t
Rsh = 21600 But/hr.

So if we increase cfm, cooling capacity increases.

Vijay

Not a chance. Dt changes and cooling capacity remains the same.
If you were right with your assumption, you could have cool a 10m by 10m cold room only by increasing air flow with a 1 btu unit output.
Please go back to the drawing board and try again.

[The Viking]

Oh Chemi,

You never let me have any fun...
:D

[vijay_study]

Hi, the question here is that, does the cooling capacity increase with an increase in airflow. My point here is that if I supply 1000cfm of air I can remove 10800 But/hr of heat if room temperature is 74degF and supply air temperature is 64degF.

Similarly if I increase the supply cfm to 2000cfm having supply air temperature of 64degF then I can remove 21600Btu/hr of heat if room temperature is 74deg F.

Vijay

[r.bartlett]

Does a 18k btu rated split give the full 18k btu's of cooling on lo, med and hi or just hi?

[chemi-cool]

Oh Chemi,

You never let me have any fun...
:D

Isn't fun depends on airflow?