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What is 'K' factor in HVAC items ?

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Question added by Anirban Dutta , Project Engineer and Manager of Design Services , Arabi enertec KSCC WLL
Date Posted: 2017/04/20
mohd faraz
by mohd faraz , SENIOR HVAC DESIGN ENGINEER (UPDA Certified) , ALYSJ Goldline Metro

its coefficient of thermal conductivity used in calculation of heat transfer thru any material.it may be differ for any material as per its heat transfer characteristic

KALPESH RACHCHH
by KALPESH RACHCHH , Senior Manager(MEP Projects) / Dept. head-HVAC , GALFAR Engineering & Contracting SAOG.

Theoretically all air flow measurement hoods should give correct measurement if Air flow irrespective to diffuser size & shape but practically there will be difference due to errors. As per ASHRAE, all measuring device to be validated with pitot tube measurement and then error to be defined which need to be added while taking measurement through hoods, This factor called k factor.

Jai Ganesh
by Jai Ganesh , Sr HVAC Engineer , ALYSJ JV

k is the property of a material to conduct heat

Jackson James
by Jackson James , MEP Engineer , Merint Interiors LLC

K factor will be different of each VAV boxes. We can calculate it approximately by the actual air flow versus the air flow of each VAV controller.

Mohammed Shebl
by Mohammed Shebl , Contracts Manager , SALFO - Engineering & Management Consultants

The K-factor is a fudge factor to get correct air flow

Byju Eduvayil
by Byju Eduvayil , Design / LEED Manager – All Project Sites , SPECON GROUP, SPECON LLC

K factor is velocity pressure loss in HVAC duct and fittings, used to calculate the external static pressure loss for sizing the fan

Ibrahim Saleh Ibrahim
by Ibrahim Saleh Ibrahim , MEP Projects Manager , Trans Emirates Electromechanical Works LLC

Do you mean diversity factor?

Diversity Factor is defined as the ratio of the sum of the individual non-coincident maximum loads of various subdivisions of the system to the maximum demand of the complete system.

in HVAC :

In large buildings with many zones and exposures the building peak load generally changes as the sun load shifts during the day.  However with VAV systems, the central heating and cooling (HVAC) equipment can be selected for the maximum building’s peak load (black load) that occurs either once during the summer (cooling peak load) or daily.  As each VAV terminal air unit is sized for the peak load of the spaces it serves, the total capacity of all of the VAV terminal air units would be much greater than the capacity of the central HVAC systems and fans.  The diversity factor is the ratio (or percentage) obtained when the total output capacity of the building HVAC system is divided by the total capacity of all Terminal Air Units connected to the system. This factor may vary considerably, but often is in the 0.7 to 0.8 (70 to 80 percent) range.

Diversity factor applicable depends on the usage of buildngsexample like : Hotels - aprox 70 to 80 %hospital - approximate - 60 to 70%schools varies and depends on usage

 

echo gumay
by echo gumay , SR.DRILLING FOREMEN , SAUDI ARAMCO

What K factor I'm also confusing

WAQAR KHAN TAREEN
by WAQAR KHAN TAREEN , Mechanical Engineer , Godwin Austen Johnson Middle East Consultant

K factor of an outlet or inlet which is also a flow factor determined from the discharge or intake velocity and the volume flow rate.

chetan sharma
by chetan sharma , Senior project engineer , trinity engineering services

incomplete question k factor for what service please explain.

Manikandan Ramachandran
by Manikandan Ramachandran , Sr.HVAC/Mechanical Design Engineer , Muscat Electronics LLC-DAIKIN Aircondition division

K Factor denoates thermal conductivity

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