Heat Loss calculation in insulated thermal oil pipes

This spreadsheet calculates heat loss in an insulated thermal oil pipe system. Let me break down the key calculations:

1. System Parameters:

• 8-inch nominal diameter pipe, 1000 feet long
• Thermal oil flowing at 100 lbm/s (45.4 kg/s)
• Oil temperature: 284°F (140°C) inlet
• Ambient air: 60°F (15.6°C), 20 ft/s velocity
• Calcium silicate insulation: 2 inches thick

2. Key Calculations:

• Reynolds number (Re) = 133,126 (turbulent flow)
• Overall heat transfer coefficient (U) = 0.94 W/m²K
• Total heat loss (Q) = 36 kW
• Temperature drop = 0.7°F (inlet to outlet)

The calculation uses:

• Convective heat transfer (air)
• Conductive heat transfer (insulation)
• Mass flow energy balance (Q = mCpΔT)