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…
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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…
HVAC 2 min read
Room Sensible Heat Factor (RSHF)
The room sensible heat factor (RSHF) represents the psychrometric process of the supply air within the conditioned space. Room Sensible…
HVAC 2 min read
APPLICATION OF PSYCHROMETRICS TO COOLING COIL SIZING
Sensible Heat V/s Latent Heat Sensible Heat is the heat content causing an increase in dry-bulb temperature. Latent Heat is…
HVAC 1 min read
WINTER MODE HEATING PROCESS
The schematic diagram below shows a typical plant system for winter heating.
HVAC 1 min read
Bypass Factor
In most cooling applications, the air leaving the cooling coil is not entirely saturated since some air does not come…
HVAC 1 min read
SUMMER MODE AIR CONDITIONING PROCESS
A basic air-conditioning schematic for summer mode is shown below: Here, return air from the conditioned space (2) mixes with…
HVAC 2 min read
PSYCHROMETRIC PROCESS AS APPLICABLE TO DIFFERENT REGIONS
There are generally four extreme climatic conditions that may involve an airconditioning system. 1. Hot and Humid (e.g. Miami) where both…
HVAC 1 min read
Mixing Process (Steady Flow)
When two streams of air with different properties and flow rates are mixed, the properties of the resulting mixture (enthalpy,…