Condenser Heat Rejection Calculation

Heat Rejection Formula:

\[ \text{Heat Rejection} = \text{Cooling Capacity} + \text{Compressor Power} \]

Heat Rejection:

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1. What is Condenser Heat Rejection?

Condenser heat rejection represents the total amount of heat that must be removed from a refrigeration or air conditioning system through the condenser. It includes both the cooling capacity (useful cooling) and the compressor power input.

2. How Does the Calculator Work?

The calculator uses the fundamental heat rejection formula:

\[ \text{Heat Rejection} = \text{Cooling Capacity} + \text{Compressor Power} \]

Where:

\( \text{Cooling Capacity} \) — Useful cooling effect produced by the system (W)
\( \text{Compressor Power} \) — Electrical power input to the compressor (W)
\( \text{Heat Rejection} \) — Total heat rejected in the condenser (W)

Explanation: This equation is based on the first law of thermodynamics, where all energy inputs (compressor power) plus the energy removed from the cooled space (cooling capacity) must be rejected through the condenser.

3. Importance of Heat Rejection Calculation

Details: Accurate heat rejection calculation is crucial for proper condenser sizing, cooling tower selection, and overall system design. It ensures efficient heat transfer and prevents system overheating.

4. Using the Calculator

Tips: Enter cooling capacity and compressor power in watts. Both values must be positive numbers. The calculator will provide the total heat rejection that needs to be handled by the condenser.

5. Frequently Asked Questions (FAQ)

Q1: Why is heat rejection greater than cooling capacity?
A: Because heat rejection includes both the cooling capacity (heat removed from the space) and the compressor power (heat added by compression).

Q2: What units should I use for the inputs?
A: The calculator uses watts (W), but you can convert from other units like BTU/hr or tons before entering values.

Q3: Does this apply to all refrigeration systems?
A: Yes, this fundamental relationship applies to vapor compression refrigeration cycles regardless of the refrigerant used.

Q4: How accurate is this calculation?
A: This provides a good estimate for most applications, but actual heat rejection may vary slightly due to system inefficiencies and heat gains/losses.

Q5: What if I have the system COP instead of compressor power?
A: You can calculate compressor power using: Compressor Power = Cooling Capacity / COP, then use this calculator.