Building Temperature- Selection

[code1]

I am selecting the operating temperature for some equipment e.g. pumps inside a building.

The external temperature is 105. The plant building is ventillated mechanically (and no A/C) with intake at +2m and outlet at +15m. There is are several industrial furnaces inside the plant on the ground level.

I was told to assume a higher temperature inside the building on say 115 so that there is a temperature gradient for heat dissipation (which makes sense).

However (in my opinion) to would assume 115 deg as the operating ambient temperature is too conservative.

Would there be any good reasons why I can select 105 instead of 115 from HVAC point of view? Large air flow? I am not very experienced in this field so appreciate advice.

 

[IRstuff]

Huh? Your external temp is 105 AND you want internal temp at 105?

TTFN

FAQ731-376

 

[sridhar1312]

When you ventilate the area having furnaces it is essential you have adequate air changes to displace the heat caused by furnaces and other equipments.

Naturally when you have only ventilation your inside temperature will be few degrees above the prevailing ambient.The increase in temperature from ambient depends on the heat load(dissipation) and air change and ambient itself.

The best way to ventilate and cool is to use the Adiabatic cooling or Indirect direct Evaporative cooling where in you can maintain lower temperature also.

 

[ChrisConley]

The warmer you can allow the interior temperature, the smaller the required airflow will be to maintain that temperature.

It is impossible to achieve ambient conditions in an enclosed space with internal heat gains. You can have a slightly higher temp, but airflow will increase greatly to achieve that.

If you can handle the 10deg above ambiant, go with it. If not, you'll need some form of cooling (the adiabatic or 'wet' cooling recommended above is a low cost method).

 

[sridhar1312]

Yes agree with Chris Conley, with sufficient air changes we can ensure 4 to 6 degrees above ambient or with Direct evaporative cooling or Indirect Direct evaporative cooling (IDEC)the temperature can be brought down closer to wet bulb temperature or lower than wet bulb when IDEC is used as we can get air at two degree less than prevailing wet bulb temperature.

By using IDEC system we have cooled huge factory with 1800 KW machine load to maintain at 26 degree C when the ambient is 42 degree C (Dry Bulb) and 19 degree C (wet Bulb).