Heat Exchanger ची गणना कशी करावी
Heat Exchanger म्हणजे काय?
Heat exchanger effectiveness and sizing depend on flow rates, temperatures, and heat transfer area. Design ensures adequate thermal transfer.
सूत्र
Calculate: Q = U×A×ΔT_lm (log mean temperature difference)
- Q
- U×A×ΔT_lm (log mean temperature difference) — U×A×ΔT_lm (log mean temperature difference)
- U
- U value — Variable used in the calculation
- A
- A value — Variable used in the calculation
चरण-दर-चरण मार्गदर्शक
- 1Calculate: Q = U×A×ΔT_lm (log mean temperature difference)
- 2Account for flow arrangement (counterflow, cross-flow, parallel)
- 3Size area for required heat transfer
Worked Examples
इनपुट
Q = 50 kW, U = 2000 W/m²·K, ΔT_lm = 10 K
परिणाम
A ≈ 2.5 m² required
Determines exchanger size
Common Mistakes to Avoid
- ✕Using arithmetic mean instead of log mean temperature difference
- ✕Neglecting fouling resistance
Frequently Asked Questions
Why is counterflow more efficient?
Counterflow maximizes temperature driving force throughout; parallel-flow has smaller LMTD.
What determines overall U coefficient?
U depends on fouling, scale, fluid properties. Typical 500-5000 W/m²·K depending on fluids.
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