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 coil. This will increase duct size and fan operating cost.…
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 of the two lines represents the condition of the supply…
Air Quantity
The air quantity required offsetting simultaneously the room sensible and latent loads and the air quantity required through the apparatus to handle the total sensible and latent loads may be…
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 conditioning apparatus must handle, including the outdoor air heat loads.…
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 Heat Factor is the ratio of room sensible and room…
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 the heat content due to the presence of water vapor…
WINTER MODE HEATING PROCESS
The schematic diagram below shows a typical plant system for winter heating.
Bypass Factor
In most cooling applications, the air leaving the cooling coil is not entirely saturated since some air does not come in contact with the cooling coil. The fraction of air…
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 required amount of outdoor air (1) at point (3) for…
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 dry bulb temperature and humidity ratio is always high. Here…
