Heat Exchanger Selection Calculation Manual

## I. Selection Base Parameters

### 1.1 Thermal Load Calculation
Q = m × Cp × ΔT

Among which:
- Q: Thermal load (kW)
- m: mass flow rate (kg/s)
- Cp: Specific heat capacity (kJ/kg·°C)
- ΔT: Temperature difference (°C)

### 1.2 Heat Transfer Area
A = Q / (K × ΔTm)

Among which:
- A: Heat transfer area (m²)
- K: Heat transfer coefficient (W/m²·°C)
- ΔTm: Log Mean Temperature Difference

## 2. Material Selection

### 2.1 Stainless Steel
- Operating temperature: -196°C ~ 800°C
- Excellent corrosion resistance
- Great value

### 2.2 Teflon
- Suitable for strong acid and alkali environments
- Temperature range: -200°C to 260°C
- Self-cleaning

## III. Structural Form

### 3.1 Shell and Tube Heat Exchanger
- Simple structure, easy to maintain
- Suitable for high-pressure conditions
- Moderate heat exchange efficiency

### 3.2 Plate Heat Exchanger
- High heat exchange efficiency
- Compact design
- Easy to add or remove heat exchange area