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 ...
Gul Bahar Shah
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 filtration and moisture control than FAHU.
Popular in hot and humid regions like GCC countries.
Ensures fresh air with controlled humidity for energy efficiency and comfort.
hashtag#AHU hashtag#FAHU hashtag#TFAHU hashtag#HVAC hashtag#HVACSystems hashtag#FreshAirSystem
hashtag#BuildingManagement hashtag#MEP hashtag#MechanicalSystems hashtag#IndoorAirQuality
hashtag#FacilitiesManagement hashtag#FMIndustry hashtag#BMS hashtag#BuildingServices
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 filtration and moisture control than FAHU.
Popular in hot and humid regions like GCC countries.
Ensures fresh air with controlled humidity for energy efficiency and comfort.
hashtag#AHU hashtag#FAHU hashtag#TFAHU hashtag#HVAC hashtag#HVACSystems hashtag#FreshAirSystem
hashtag#BuildingManagement hashtag#MEP hashtag#MechanicalSystems hashtag#IndoorAirQuality
hashtag#FacilitiesManagement hashtag#FMIndustry hashtag#BMS hashtag#BuildingServices
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