perfil de temperatura para trocador de calor de fluxo cruzado

Aqui está uma análise do perfil de temperatura para um trocador de calor de fluxo cruzado, especificamente quando ambos os fluidos não são misturados:

🔥 Trocador de calor de fluxo cruzado – ambos os fluidos não misturados

➤ Arranjo de fluxo:

• Um fluido flui horizontalmente (digamos, fluido quente em tubos).
• The other flows vertically (say, cold air across the tubes).
• No mixing within or between the fluids.

📈 Temperature Profile Description:

▪ Hot Fluid:

• Inlet temperature: High.
• As it flows, it loses heat to the cold fluid.
• Outlet temperature: Lower than inlet, but not uniform across the exchanger due to varying contact time.

▪ Cold Fluid:

• Inlet temperature: Low.
• Gains heat as it flows across the hot tubes.
• Outlet temperature: Higher, but also varies across the exchanger.

🌀 Because of the crossflow and no mixing:

• Each point on the exchanger sees a different temperature gradient, depending on how long each fluid has been in contact with the surface.
• The temperature distribution is nonlinear and more complex than in counterflow or parallel flow exchangers.

📊 Typical Temperature Profile (schematic layout):

                ↑ Fluido frio em
        │
  Alto │ ┌──────────────┐
  Temperatura │ │ │
        │ │ │ → Fluido quente em (lado direito)
        │ │ │
        ↓ └──────────────┘
      Saída de fluido frio ← Saída de fluido quente

⬇ Temperature Curves:

• Cold fluid gradually heats up — the curve starts low and arcs upward.
• Hot fluid cools down — starts high and arcs downward.
• The curves are not parallel, e not symmetrical due to crossflow geometry and varying heat exchange rate.

🔍 Efficiency:

• The effectiveness depends on the heat capacity ratio and the NTU (Number of Transfer Units).
• Generally less efficient than counterflow but more efficient than parallel flow.