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April 2, 2017 at 12:57 pm #3053
The estimate of cooling load for air conditioning purposes may be classified as
 Room load (sensible and latent heat) that which falls in the room directly
 The total load that falls on the apparatus
Room Load:
a) Room Sensible Heat (RSH):
This includes the following: Solar and transmission heat gain through walls, roof, etc.
 Solar and transmission heat gain through glass.
 Transmission gain through partition walls, ceiling, floor, etc.
 Infiltration.
 Internal heat gains not accounted above, safety factor, etc.
 Additional heat gains not accounted above, safety factor, etc.
 Supply duct heat gain, supply duct leakage loss and fan horsepower.
The sum of above, (i) to (vii) is called the room sensible heat (RHS) load. Further, the following components are also included in the room sensible heat.  Bypassed outside air load.
The sum of (i) to (viii) is known as the Effective Room Latent Heat (ERLH).
b) Room Latent Heat (RLH):
This includes the following: infiltration
 Internal heat gain from people, steam, appliances, etc.
 Vapor transmission
 Additional heat gains not accounted above, safety factor, etc.
 Supply duct leakage loss.
The sum of above (i) to (v) is known room latent heat (RLH). Further, the following latent heat load is also included.  Bypasses outside air load.
The sum of above, (i) to (vi) is called effective room latent heat (ERLH).
Total Load
The sum of item A and B except (viii) of A and (vi) of B is called room total heat (RTH), while sum of all items of A and b is known as effective room total heat (ERTH). For calculating Grand Total Load on Airconditioning apparatus, the following loads are considered.
a) Sensible Heat
 Effective room sensible heat (ERSH)
 Sensible heat of the outside air that is not bypassed
 Return duct heat gain, return leaking duct gain, dehumidifier pump power losses, and piping loss.
The sum of items (i) to (iii) is known as total sensible heat (TSH).
b) Latent Heat
 Effective room latent heat (ERLH)
 Latent heat of outside air which is not bypassed
 Return duct leakage gain.
The sum of items (i) to (ii) is the total latent heat (TLH). Finally, the sum of above (A) sensible heat and (B) latent heat is known as grand total heat (GTH)

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