How to Calculate EER2

EER2 Formula:

\[ EER2 = \frac{Cooling\ Capacity\ (BTU/hr)}{Input\ Power\ (W)} \times 3.412 \]

EER2 (BTU/W):

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1. What is EER2?

EER2 (Enhanced Energy Efficiency Ratio) is a metric used to measure the energy efficiency of cooling equipment, particularly for part-load conditions. It provides a more accurate assessment of real-world energy performance compared to standard EER.

2. How Does the Calculator Work?

The calculator uses the EER2 formula:

\[ EER2 = \frac{Cooling\ Capacity\ (BTU/hr)}{Input\ Power\ (W)} \times 3.412 \]

Where:

\( Cooling\ Capacity \) — The cooling output in British Thermal Units per hour (BTU/hr)
\( Input\ Power \) — The electrical power input in Watts (W)
\( 3.412 \) — Conversion factor from Watts to BTU/hr

Explanation: EER2 represents the ratio of cooling output to electrical input, with higher values indicating better energy efficiency.

3. Importance of EER2 Calculation

Details: EER2 is crucial for evaluating the energy efficiency of HVAC systems under part-load conditions, which represent typical operating scenarios. It helps in selecting energy-efficient equipment and estimating operating costs.

4. Using the Calculator

Tips: Enter cooling capacity in BTU/hr and input power in Watts. Both values must be positive numbers. The calculator will compute the EER2 value in BTU/W.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between EER and EER2?
A: EER2 is an enhanced version that accounts for part-load performance, providing a more realistic efficiency rating for typical operating conditions compared to full-load EER.

Q2: What are typical EER2 values for air conditioners?
A: Typical EER2 values range from 8 to 12 BTU/W for standard units, with high-efficiency models reaching 14+ BTU/W.

Q3: Why is the 3.412 conversion factor used?
A: 3.412 converts Watts to BTU/hr since 1 Watt = 3.412 BTU/hr, allowing for consistent units in the efficiency calculation.

Q4: How does EER2 affect energy costs?
A: Higher EER2 values indicate better efficiency, leading to lower electricity consumption and reduced operating costs for cooling systems.

Q5: Is EER2 used for all types of cooling equipment?
A: EER2 is primarily used for unitary air conditioners and heat pumps, with specific testing standards for different equipment types and capacities.