Calculator
Example Data Table
| Scenario | Feed Volume | Feed TDS | Recovery | Heater Power | Estimated Distillate |
|---|---|---|---|---|---|
| Bench setup | 10 L | 250 ppm | 70% | 2.0 kW | 7.0 L |
| Teaching batch | 25 L | 500 ppm | 80% | 3.5 kW | 20.0 L |
| Pilot run | 50 L | 900 ppm | 85% | 6.0 kW | 42.5 L |
Formula Used
Feed mass: Feed Volume × Density
Distillate volume: Feed Volume × Recovery Fraction
Sensible heat: Feed Mass × Specific Heat × (Boiling Temperature − Feed Temperature)
Latent heat: Distillate Mass × Latent Heat
Total theoretical energy: Sensible Heat + Latent Heat
Actual energy: Total Theoretical Energy ÷ Thermal Efficiency Fraction
Runtime: Actual Energy (kWh) ÷ Heater Power
Distillate TDS: Feed TDS × (1 − Rejection Fraction)
Concentrate TDS: (Feed Solids − Distillate Solids) ÷ Concentrate Volume
How to Use This Calculator
- Enter the feed volume and initial feed temperature.
- Enter the target boiling temperature and heater power.
- Set thermal efficiency and the recovery target.
- Add operating hours and electricity cost values.
- Review the physical property defaults and change them if needed.
- Enter feed TDS and the expected dissolved solids rejection.
- Press Calculate to display the result block above the form.
- Use the CSV button for spreadsheet work or the PDF button for a printable report.
Water Distillation in Chemistry
Why a Water Distillation Calculator Matters
Water distillation separates vapor from dissolved solids and many impurities. The process uses heating, evaporation, condensation, and collection. A calculator predicts performance before a batch starts. That matters in laboratories, classrooms, and small production units. Users can test volume, temperature, power, recovery, and efficiency quickly. This reduces trial and error. It also supports better planning and safety. Clear estimates improve scheduling, energy control, and equipment selection. When heat demand is known early, operators can prepare utilities, glassware, and runtime with fewer surprises during the distillation run.
Core Variables That Influence Distillation
Feed volume controls the mass entering the still. Feed temperature changes sensible heat demand. Boiling temperature sets the heating target. Latent heat represents the energy needed for vapor formation. Thermal efficiency captures losses from the vessel and surroundings. Recovery percentage estimates collected product water. Rejection percentage estimates how many dissolved solids remain behind. Heater power affects runtime and hourly output. Electricity price affects operating cost. These variables work together. Small changes can shift output, cost, and purity. That is why a structured calculator helps compare process conditions with consistency and accuracy.
How the Results Support Decisions
The results combine mass balance and energy balance in one place. Sensible heat shows the energy needed to raise temperature. Latent heat shows the energy needed for phase change. Total theoretical energy joins both values. Actual energy then accounts for efficiency loss. The calculator also estimates electricity use, runtime, distillate volume, concentrate volume, distillate TDS, and concentrate TDS. These outputs help users judge capacity and product quality. They also support budgeting decisions. A quick estimate can show whether a heater is undersized or whether the chosen recovery target is practical.
Best Practice for Reliable Inputs
Use measured inputs whenever possible. Enter realistic recovery values. Perfect recovery is uncommon in practical equipment. Use feed TDS from a meter or lab test. Review heater efficiency honestly, especially in small stills. Check boiling assumptions if pressure differs from normal conditions. Compare calculated values with real results after each run. Then refine the defaults for future batches. This makes the tool more reliable over time. A calculator does not replace experiments. It improves preparation. Better preparation supports cleaner records, steadier operation, and better purified water planning in daily chemistry work and documentation.
FAQs
1. What does water distillation remove?
Distillation heats water until vapor forms, then condenses it. Most dissolved salts, metals, and nonvolatile solids remain in the boiling chamber. This makes distillation useful for producing low TDS water in labs and small process systems.
2. Does distillation remove every contaminant?
No. Distillation removes many contaminants, but performance depends on the setup. Volatile compounds can carry over without proper design or venting. Post treatment or multiple stages may still be needed for demanding purity targets.
3. Why does feed temperature matter?
Feed temperature changes sensible heat. Colder feed needs more heating before boiling starts. Warmer feed lowers total energy demand and may reduce runtime for the same heater and recovery target.
4. What is recovery in water distillation?
Recovery is the share of feed converted into collected distillate. Higher recovery increases product volume, but it also concentrates the remaining liquid. Very high recovery can reduce practical efficiency and raise fouling risk.
5. Why is thermal efficiency important?
Thermal efficiency reflects heat losses from the vessel, tubing, lid, and surroundings. Low efficiency means more electricity is needed than the theoretical minimum. Estimating this value honestly makes the calculator more realistic.
6. Can I use TDS to estimate purity?
Yes. TDS is a practical estimate for dissolved solids. If you know feed TDS and rejection efficiency, the calculator can estimate distillate TDS and the concentration increase in the remaining liquid.
7. Is this calculator enough for design approval?
It improves planning, not certification. Real systems vary because of pressure, insulation, condenser performance, carryover, and scale buildup. Use measured plant or lab data to refine assumptions after each operating run.
8. Where is this tool most useful?
Use it for lab planning, utility estimates, classroom demonstrations, batch comparisons, and small pilot studies. It is especially helpful when you need quick mass and energy checks before heating water.