Thermodynamics 1 min read
Psychrometric chart
A Psychrometric chart graphically represents the thermodynamic properties of moist air. Standard psychrometric charts are bounded by the dry-bulb temperature…
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Thermodynamics 1 min read
Humid specific heat
From the equation for enthalpy of moist air, the humid specific heat of moist air can be written as: where…
Thermodynamics 3 min read
Enthalpy
Enthalpy is the measure of heat energy in the air due to sensible heat or latent heat. Sensible heat is…
Thermodynamics 2 min read
Important psychrometric properties
Dry bulb temperature (DBT) is the temperature of the moist air as measured by a standard thermometer or other temperature measuring…
Thermodynamics 2 min read
Methods for estimating properties of moist air
In order to perform air conditioning calculations, it is essential first to estimate various properties of air. It is difficult…
Thermodynamics 1 min read
Amagat’s & Dalton’s Law
Amagat’s Law The volume of an ideal gas mixture (V) is equal to the sum of the component volumes (Vj’s)…
Thermodynamics 2 min read
MASS AND MOLE FRACTION
If we want to deal with the problems of gas mixture, two laws should always be taken into consideration. One…
HVAC 1 min read
Coil Load Calculation Example
Determine the minimum cooling coil load and required chilled water flow for a system serving an office space with a…
HVAC 3 min read
Psychrometric representation for blow-through AHU
Summarizing, draw-through units typically require 10% more supply air than blow through systems for the same temperature off the cooling…
HVAC 2 min read
Psychrometric Representation for Draw-through AHU Arrangement
We have learnt that when both the RSHF and GSHF ratio lines are plotted on the psychrometric chart, the intersection…
HVAC 4 min read
Air Quantity
The air quantity required offsetting simultaneously the room sensible and latent loads and the air quantity required through the apparatus…
HVAC 2 min read
Grand Sensible Heat Factor (GSHF)
Grand Sensible Heat Factor is the ratio of the total sensible heat to the grand total heat load that the…
