MIS 3005 Heat Loss Calculator

Heat Loss Formula (MIS 3005):

\[ Q = U \times A \times \Delta T + \text{Ventilation} \]

U-Value:

W/m² K

Surface Area:

m²

Temperature Difference (ΔT):

Ventilation Loss:

Total Heat Loss (Q): W

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1. What is the MIS 3005 Heat Loss Calculator?

Definition: This calculator determines heat loss according to the MIS 3005 standard, considering both transmission through building elements and ventilation losses.

Purpose: It helps engineers and architects calculate the thermal performance of buildings for heating system design and energy efficiency assessments.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = U \times A \times \Delta T + \text{Ventilation} \]

Where:

\( Q \) — Total heat loss (Watts)
\( U \) — U-value of the building element (W/m² K)
\( A \) — Surface area of the element (m²)
\( \Delta T \) — Temperature difference between inside and outside (Kelvin)
\( \text{Ventilation} \) — Additional heat loss from air changes (Watts)

Explanation: The formula calculates conductive heat loss through building elements and adds any additional ventilation losses.

3. Importance of Heat Loss Calculation

Details: Accurate heat loss calculations are essential for proper heating system sizing, energy efficiency compliance, and thermal comfort in buildings.

4. Using the Calculator

Tips: Enter the U-value of your building element, its surface area, the temperature difference, and any additional ventilation losses. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Modern insulated walls typically have U-values between 0.15-0.30 W/m² K, while older walls may be 1.0-2.0 W/m² K.

Q2: How do I calculate ΔT?
A: Subtract the outside design temperature from your desired indoor temperature (e.g., 20°C inside - (-5°C outside) = 25 K ΔT).

Q3: Where can I find ventilation loss values?
A: Ventilation losses can be calculated separately based on air changes per hour or obtained from mechanical system specifications.

Q4: Does this calculator account for thermal bridging?
A: No, for comprehensive calculations, thermal bridging effects should be considered separately and added to the total.

Q5: Is this suitable for whole-building calculations?
A: Yes, but you'll need to calculate each building element separately and sum the results for a complete assessment.