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Delta T (ΔT) in HVAC Systems – Complete Explanation

Gul Bahar Shah
  Delta T (ΔT) in HVAC Systems – Complete Explanation In HVAC, Delta T (ΔT) means: Difference between two temperatures Formula: ΔT=T1−T2​ Where: ΔT = Temperature difference T₁ = First temperature T₂ = Second temperature Why Delta T is Important in HVAC Delta T tells us: • How much cooling or heating is happening • Whether equipment is working properly • Energy efficiency of system • Water flow and air flow condition • Coil performance • Chiller efficiency In HVAC mainly two Delta T are used: • Water Side Delta T • Air Side Delta T 1. Water Side Delta T (Chilled Water / Hot Water) This is the temperature difference between: • Supply water temperature • Return water temperature Usually used in: • Chillers • FCU • AHU • Heat exchangers Chilled Water Delta T In cooling system: • Chiller sends cold water → called CHWS (Chilled Water Supply) • Water absorbs room heat • Warm water returns → called CHWR (Chilled Water Return) Formula: ΔTwater = Treturn−Tsupply​ Example 1 – Normal ...
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FM-200 Fire Suppression System

Gul Bahar Shah
    FM-200 Fire Suppression System – Step-By-Step Flow Explained 🔹 The FM-200 system is a fast-acting, clean-agent fire suppression solution used in data centers, control rooms, server rooms, and critical facilities. Here’s how the system works: 1️⃣ Fire Detection Advanced smoke and heat detectors identify the fire at an early stage. 2️⃣ Pre-Discharge Warning Alarm sirens and strobes activate to warn occupants to evacuate immediately. 3️⃣ Agent Discharge FM-200 (Heptafluoropropane) is released quickly to suppress the fire without damaging equipment. 4️⃣ Fire Suppression The agent absorbs heat, breaks the fire triangle, and extinguishes the fire within seconds. 5️⃣ Post-Discharge Actions Ventilation starts, and the area is inspected to ensure safety and system reset. hashtag # FMSuppression hashtag # FM200 hashtag # FireSafety hashtag # FireProtection hashtag # LifeSafety hashtag # FireSystem hashtag # SafetyEngineering hashtag # MechanicalEngineer hashtag # QCEngineer ...
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Key Function points of AHU FAHU TFAHU

Gul Bahar Shah
  Key Function points of AHU FAHU TFAHU 1. AHU – Air Handling Unit Function: Handles indoor air only. It recirculates air from inside the building, conditions it (cooling or heating), filters it, and supplies it back into the rooms. Key Points: Mostly uses return air from inside the building. Limited fresh air. Used in malls, offices, hospitals, airports. Main job: temperature and humidity control. 2. FAHU – Fresh Air Handling Unit Function: Dedicated for fresh outside air. It takes 100% outdoor air, filters it heavily, cools it (or heats), and then supplies it into the building. Key Points: Takes only outdoor air. Used where indoor air quality needs to be high. Helps maintain oxygen level and positive pressure. Often works together with AHU. 3. TFAHU – Treated Fresh Air Handling Unit Function: An upgraded version of FAHU. It not only cools and filters outdoor air but also dehumidifies and treats it to a higher standard before supplying. Key Points: 100% fresh air. Better filtrati...
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