What Is the Direct-Fired Absorption Chiller COP Calculator?
Direct-fired double-effect water/lithium bromide (H₂O/LiBr) absorption chillers burn natural gas directly in a high-temperature desorber generator to produce chilled water without mechanical vapor compressors.
Because refrigerant water vaporization and LiBr absorbent recombining occur thermally, the cooling tower must reject both the building evaporator heat and the full fuel combustion energy.
This calculator determines thermal COP, refrigeration capacity in tons, fuel consumption (Nm³/h), and required cooling water flow rate.
How Does the Direct-Fired Absorption Chiller COP Calculator Work?
The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.
Direct-Fired Absorption Chiller COP Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Thermal COP divides cooling output by fuel firing rate. Cooling tower rejection combines both evaporator load and fuel thermal input.
How to Use the Direct-Fired Absorption Chiller COP Calculator
- Enter your primary measurements in the input fields above.
- Select your preferred units (e.g. metric or imperial) if applicable.
- Review or adjust operational assumptions such as field efficiency.
- Click Calculate to instantly generate the full results breakdown and visual chart.
- Use the Reset button at any time to clear the form and test a new scenario.
Step-by-Step Example Calculation
Hospital 200 TR Direct-Fired Chiller
Input Values:
Understanding Your Result
Your calculated result represents the realistic operational capacity or baseline output under the specified conditions. Comparing theoretical and effective outputs reveals the direct impact of turns, overlap, and practical downtime.
Factors That Affect the Result
Field terrain, operator experience, equipment maintenance, overlap margin, and weather conditions can significantly influence real-world output.
When Should You Use This Calculator?
Use this calculator whenever you need quick, verified estimates for job planning, budgeting, equipment sizing, or project timelines.
Assumptions & Limitations
- Double-effect direct-fired machines typically achieve thermal COPs between 1.10 and 1.35.
- Cooling tower duty is approximately 2.0x higher per ton than electric centrifugal chillers.
Frequently Asked Questions
Calculation Accuracy & Reference Note
This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.