The document outlines principles of air conditioning and ventilation systems, detailing calculations for sensible and latent heat loads, as well as total heat load. It introduces concepts like the sensible heat ratio and methods of comfort cooling, including all outside air and recirculation. Various charts are provided for reference, aimed at professionals in HVAC systems with a focus on efficient cooling design.

1. AIR CONDITIONING and VENTILATION SYSTEMS
NME 515
COMFORT COOLING
Engr. Charlton Inao, ME
TESDA TVET NC Level 3 RAC-CRE Certified
17/23/2020 E ngr Charlton Inao

2. COMFORT COOLING
Engr. Charlton Inao, ME
TESDA TVET NC Level 3 RAC-
CRE Certified
27/23/2020 E ngr Charlton Inao

3. COMFORT COOLING
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• BASIC CONSIDERATION
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4. COMFORT COOLING
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• AIR CONDITIONING LOAD
1] Sensible Heat Load
Qs = Ma CPa (DB2 -DB1)
Where Qs = sensible heat
Ma = mass flow of air
CPa = specific heat of air
DB = dry bulb
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5. COMFORT COOLING
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• AIR CONDITIONING LOAD
2] Latent Heat Load
QL = Ma Cpa (SH2 -SH1) hgat DB
Where Ma = mass flow of air
SH = specific humidity
hgat DB = enthalpy of gas at dry bulb temperature
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6. COMFORT COOLING
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• AIR CONDITIONING LOAD
3] Total Heat Load
QT = Qs + QL = Ma (h2-h1)
Where QT = total heat
Qs = sensible heat
QL = latent heat
Ma = mass flow of air
h2-h1 = enthalpy
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7. COMFORT COOLING
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• SENSIBLE HEAT RATIO (FACTOR)
SHR =
Qs
QS + QL
This factor is designed to make it easy to find the coil
(apparatus) temperature.
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8. COMFORT COOLING
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ILLUSTRATION: All outside air- No Recirculation
To Determine: DB, or Coil Temp.
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9. COMFORT COOLING
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CARRIER CHART
Ref. Pt. 50 RH, 80 DB (℉)
50 RH, 24D DB (℃)7/23/2020 E ngr Charlton Inao

10. COMFORT COOLING
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CARRIER CHART
Ref. Pt. 50 RH, 80 DB (℉)
50 RH, 24D DB (℃)7/23/2020 E ngr Charlton Inao

11. COMFORT COOLING
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Methods of Comfort Cooling
1. All outside air
2. Recirculation
3. Recirculation with Bypass
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12. COMFORT COOLING
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13. COMFORT COOLING
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14. COMFORT COOLING
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