1. What is the Power to Weight Ratio?

The power to weight ratio (kW/ton) is a measure of energy efficiency, calculated from the Energy Efficiency Ratio (EER). It indicates how much power (in kW) is required to produce one ton of cooling.

2. How Does the Calculator Work?

The calculator uses the power to weight equation:

Where:

• \( pwr \) — Power to weight ratio (kW/ton)
• \( EER \) — Energy Efficiency Ratio (unitless)

Explanation: The equation converts EER (Btu/Wh) to power to weight ratio (kW/ton) by dividing the constant 12 by the EER value.

3. Importance of Power to Weight Calculation

Details: This calculation is important for comparing the energy efficiency of different cooling systems and understanding their power requirements per unit of cooling capacity.

4. Using the Calculator

Tips: Enter the Energy Efficiency Ratio (EER) value. The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a good power to weight ratio?
A: Lower values indicate better efficiency. Typical values range from 0.5 to 1.5 kW/ton for modern systems.

Q2: How does EER relate to SEER?
A: EER measures efficiency at a specific operating condition, while SEER (Seasonal EER) accounts for seasonal variations.

Q3: Why is 12 used in the equation?
A: 12 comes from the conversion between Btu/h and kW (1 kW = 3412 Btu/h) and tons of refrigeration (1 ton = 12000 Btu/h).

Q4: Can this be used for heating systems?
A: No, this calculation is specific to cooling systems. Heating systems use different efficiency metrics.

Q5: What affects EER values?
A: EER is affected by equipment design, operating conditions, and temperature differences between indoor and outdoor environments.