HVAC - Primary airflow temperatre

In summary, the conversation is discussing the effect of changing the primary airflow temperature on diffusers from 22°C to 13°C on Draught rating (DR) and comfort criteria calculations. It is being questioned whether this change will result in a denser air and if that is taken into consideration in the DR equation. The team agrees that the temperature and turbulence of the supplied air are more influential factors and that 22 degrees is closer to the temperature of the already occupied space, while 13 degrees is closer to the temperature of the supplied air. It is mentioned that there is a difference in density of approximately 0.2 kg/m3 between the two temperatures.
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TL;DR Summary
Air Temperature affects.
Hi team,
I am after some assistance. When I am amending the primary airflow temperature on diffusers from 22°C to 13°C, it is my opinion that all the Draught rating (DR) and comfort criteria calcs will all change as the air will become more dense. Is this correct?
 
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  • #2
As far as I understand, the DR equation does not consider the density of air.
Temperature and turbulence of the supplied air are factors of more influence.
Normally, 22 degrees is closer to the temperature of the air already in the occupied space, while 13 degrees is closer to the temperature of the air that is supplied into the space via diffusers and being mixed with the warmer air, being the difference in density of 0.2 kg/m3 aproximately.
 

1. What is primary airflow temperature in HVAC systems?

Primary airflow temperature refers to the temperature of the air that is being supplied to a building through the HVAC system. It is typically measured at the air handler unit and is controlled by the thermostat to maintain a comfortable indoor temperature.

2. How is primary airflow temperature determined?

The primary airflow temperature is determined by a combination of factors, including the outdoor temperature, the desired indoor temperature, and the size and efficiency of the HVAC system. It is typically set by a trained HVAC technician during installation and can be adjusted if needed.

3. Why is primary airflow temperature important?

Primary airflow temperature is important because it directly affects the comfort and energy efficiency of a building. If the temperature is too high or too low, it can lead to discomfort for occupants and potentially cause strain on the HVAC system, resulting in higher energy costs.

4. How does primary airflow temperature impact air quality?

The primary airflow temperature can impact air quality in a building by affecting the humidity levels. If the temperature is too high, it can lead to increased humidity, which can create a breeding ground for mold and bacteria. If the temperature is too low, it can lead to dry air, which can cause respiratory issues for occupants.

5. Can the primary airflow temperature be adjusted?

Yes, the primary airflow temperature can be adjusted if needed. However, it is important to consult a trained HVAC technician to ensure that the adjustment is done properly and does not negatively impact the system's performance or energy efficiency.

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