ETone HVAC System Design Simplified Method for Early Design Environmental Technology 1 Part Classroom 1 Classroom 2 Classroom 3 Classroom 4 Corridor Air Delivery side Return ducts and diffusers Mechanical Room Air Handling Unit (Air-conditioning) VAV Box VAV Box VAV Box VAV Box Supply ducts and diffusers Fresh outside air
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ETone
HVAC System DesignSimplified Method for Early DesignEnvironmental
Technology 1
Part
Classroom 1 Classroom 2 Classroom 3 Classroom 4
Corridor
Air Delivery sideReturn ducts and diffusers
Mechanical Room
Air Handling Unit(Air-conditioning)
VAV Box VAV Box VAV Box VAV Box
Supply ducts and diffusers
Fresh outside air
ETone
! Estimate the space cooling requirement
! Estimate ventilation requirement
! Determine supply air quantiy for eachzone and AHU
! Estimate equipment sizes - space sizes
! Revise system layout
Introduction
HVAC Design Procedures
ETone
Residential 1cfm/sfOffice 1.2 cfm/sfSchool 1.5 cfm/sfAud. / theater 2.5 cfm/sfventilation load not included
Estimate Space Cooling Load
Simplified method for determining the spacecooling load
Floor area x cooling load factor = required cfm
Cooling load factor
ETone
Classroom 1 Classroom 2 Classroom 3 MechanicalClassroom 425'X30' 25'X30' 25'X30' 25'X30'750 sf 750 sf 750 sf 750 sf
1,125 cfm 1,125 cfm 1,125 cfm 1,125 cfm
Estimate Space Cooling Load Example
Calculate floor area
Determine CFM required(Floor area) x (1.5 cfm - school)
ETone
Residential 10 cfm/personOffice 20 cfm/personSchool 15 cfm/personAud. / theater 15 cfm/personadds to the space cooling load