1. What is REScheck Heat Loss Calculation?

Definition: This calculator determines heat loss through building envelopes according to REScheck standards.

Purpose: Helps builders and energy auditors evaluate building envelope performance for energy code compliance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat loss rate (BTU/hour)
• \( UA \) — Overall heat transfer coefficient (BTU/hour °F)
• \( \Delta T \) — Temperature difference between inside and outside (°F)

Explanation: The UA value represents the building envelope's thermal performance, multiplied by the temperature difference to calculate heat loss.

3. Importance of Heat Loss Calculation

Details: Proper heat loss calculation ensures energy-efficient building design, compliance with energy codes, and optimal HVAC system sizing.

4. Using the Calculator

Tips: Enter the UA value (from REScheck software or manual calculations) and the design temperature difference. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical UA value?
A: UA values vary by building size and insulation levels. REScheck software calculates this based on your building components.

Q2: How do I determine ΔT?
A: Use your local design temperature difference (indoor design temp minus outdoor design temp).

Q3: Does this account for air infiltration?
A: No, this calculates conduction heat loss only. REScheck considers infiltration separately.

Q4: Where can I find UA values for common assemblies?
A: REScheck documentation or ASHRAE Fundamentals provide typical UA values.

Q5: How does this relate to energy codes?
A: REScheck uses UA calculations to verify compliance with IECC or other energy codes.