Average outside temperature on design day Calculator

Average Outside Temperature Formula:

\[ t_o = t_{od} - \left(\frac{DR}{2}\right) \]

Average Outside Temperature:

°C

1. What is Average Outside Temperature on Design Day?

Definition: This calculator estimates the average outside temperature on a design day based on the outside design dry bulb temperature and daily temperature range.

Purpose: It helps HVAC engineers and building designers determine the average temperature conditions for thermal load calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ t_o = t_{od} - \left(\frac{DR}{2}\right) \]

Where:

\( t_o \) — Average outside temperature (°C)
\( t_{od} \) — Outside design dry bulb temperature (°C)
\( DR \) — Daily temperature range (°C)

Explanation: The formula calculates the average temperature by subtracting half of the daily temperature range from the design dry bulb temperature.

3. Importance of Temperature Calculation

Details: Accurate temperature estimation is crucial for proper HVAC system sizing, energy efficiency calculations, and building thermal performance analysis.

4. Using the Calculator

Tips: Enter the outside design dry bulb temperature and daily temperature range in °C. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is design dry bulb temperature?
A: It's the temperature value used as a basis for design calculations, typically representing extreme conditions.

Q2: How is daily temperature range determined?
A: It's calculated as the difference between the maximum and minimum temperatures recorded during a day.

Q3: Why use average temperature instead of peak temperature?
A: Average temperature provides a more representative value for sustained thermal load calculations.

Q4: What does the ±5% represent?
A: It indicates the expected margin of error in the calculation due to variable environmental factors.

Q5: Can this be used for any location?
A: Yes, but accuracy depends on using appropriate local temperature data for inputs.