Hydraulic Flow Calculation (FPS Fire Fighting System) 1. Basic Concept Hydraulic calculation ensures that required flow and pressure reach the most remote sprinkler /hydrant point under worst-case conditions. It is based on: Flow demand (Q) Pressure requirement (P) Pipe losses (friction + fittings) Elevation differences 2. Core Hydraulic Formula Flow-Pressure Relationship (Sprinkler) Q=KPQ = K \sqrt{P}Q=KP Where: Q = Flow rate (LPM or GPM) K = Sprinkler discharge coefficient P = Pressure at sprinkler (bar or psi) 3. Head Loss Calculation (Pipe Friction) Hazen-Williams Formula (most commonly used) As forluma given in image. 4. Total Head Requirement Total Pump Head HT=Hs+Hf+Hv+Hr Where: Hs = Static head (height difference) Hf = Friction loss Hv = Velocity head Hr = Residual pressure required at sprinkler/hydrant 5. Typical Data Center Design Criteria For data centers (high-value assets): 5 reaction
Important Units Conversions for HVAC Engineers
As Mechanical & HVAC professionals, quick unit conversions are essential in daily calculations, troubleshooting, and system design. Here is a quick reference list of commonly used engineering conversions. 🔹 LENGTH • 1 m = 3.28 ft • 1 ft = 12 in = 0.305 m • 1 in = 25.4 mm 🔹 FLOW • 1 L/s = 2.12 cfm • 1 L/s = 15.85 U.S. gpm • 1 L/s = 3.6 m³/h 🔹 PRESSURE • 1 Bar = 10⁵ Pa • 1 Bar = 14.5 psi • 1 Bar = 10 m.w.g • 1 Bar = 750 mm Hg • 1 in.w.g = 249.09 Pa 🔹 VOLUME • 1 m³ = 35.28 ft³ • 1 m³ = 1000 L • 1 U.S. gal = 3.785 L • 1 U.K. gal = 4.55 L 🔹 MASS • 1 kg = 1000 g • 1 kg = 35.27 oz • 1 kg = 2.2 lb • 1 tonne = 1000 kg 🔹 TEMPERATURE • °C = °K − 273.15 • °F = (°C × 1.8) + 32 🔹 COOLING LOAD • 1 kW = 3415 Btu/hr • 1 RT = 3.517 kW • 1 RT = 12,000 Btu/hr • 1 MBH = 1000 Btu/hr • 1 MBH = 0.29 kW 🔹 VELOCITY / SPEED • 1 m/s = 197 fpm • 1 fpm = 1 cfm/ft² 🔹 ENERGY • 1 Btu = 1055 J 🔹 AREA • 1 m² = 10.76 ft² 🔹 ELECTRIC POWER • 1 HP = 0.75 kW
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