Glycol cooling load estimates
Glycol calculator for cooling load and flow
For a brewery planning glycol chiller sizing, this glycol calculator estimates cooling demand, heat load, temperature difference and flow. If you’re looking for a propylene glycol percentage calculator, you’ll need to establish your mix separately before using that concentration for cooling-load estimates here.
Send the glycol calculator results with your question so the engineer can discuss the equipment you need.
Use the glycol calculator for cooling load and flow
Send an engineer your glycol chiller sizing numbers
Include your glycol percentage calculator figures in the project description if you’re working out your mix. This form includes your cooling calculations so you don’t have to retype them. Solon’s engineering consulting services include equipment specification and procurement. We supply brewery equipment; our guide to glycol chiller system design explains the sizing questions to settle before choosing a chiller package. Send the glycol calculator results with your question so the engineer can discuss the equipment you need.
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How This Calculator Works
This glycol system calculator uses industry-standard thermal calculation principles to size your glycol cooling system:
- Flow Rate Calculation: Based on BTU load, temperature differential, and glycol properties
- Safety Factors: Built-in margins for real-world operating conditions
Important Considerations
This calculator provides preliminary sizing estimates. Final system design should include:
- Detailed heat load analysis for each cooling zone
- Pressure drop calculations for complete piping layout
- Control system integration and automation requirements
- Local code compliance and permit requirements
How Glycol Chiller Sizing Works
Every load on the loop gets counted: heat of fermentation at peak, crash-cooling pulldown, brite and cold-storage holding loads, and line losses. The chiller has to carry the worst-case coincident load, not the average day, and the reserve above that number is what keeps fermentation on setpoint during a hot-side transfer. Our brewery engineering best practices cover loop balancing, delta T and branch flow for exactly this reason.
Glycol percentage is a protection decision, not a performance upgrade. Propylene glycol is blended to protect the loop a few degrees below the coldest setpoint in the system; running richer than needed costs heat-transfer efficiency and pumping power for nothing. Delta-T across supply and return, flow rate, and header sizing then determine whether the capacity you bought actually reaches the jackets.
What glycol percentage should I run?
Enough to protect below your coldest operating point, typically the 28 to 35 percent propylene glycol range for cellar service at common setpoints. Over-blending reduces system capacity, so the right answer comes from your lowest setpoint, not a rule of thumb.
Why does my glycol system struggle during crash cooling?
Crash cooling is usually the peak coincident load, and systems sized on fermentation alone fall behind it. Staging crashes, adding reserve capacity, or scheduling around the peak are the standard fixes, in that order of cost.
Is calculator output enough to buy a chiller?
It is enough to budget and to sanity-check vendor proposals. A purchase specification should come from an engineered load profile of your actual tanks, schedule, and ambient conditions, which is the service behind this tool.
Per-Vessel Cooling Load Table
Chiller sizing starts from the vessels, so list them. This table applies the water-equivalent pulldown formula, volume times 8.34 times degrees per hour, to each jacketed vessel in the plant: fermenters, cultured dairy tanks, mix tanks, crystallizers, or any process vessel on the glycol loop. Enter each vessel’s volume and its worst-case pulldown rate, and the table totals the coincident load to carry into the calculator above.
| Vessel | Volume (gal) | Pulldown (°F/hr) | Load (BTU/hr) | |
|---|---|---|---|---|
| Total coincident load | 0 |
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