mburns
11-03-2013, 10:33 AM
I have quick question which has been bugging me, asked around, researched a bit all to no avail.
Concerning some smaller Daikin equipment in particular smaller sized residential ducted units. Basically they are metered outdoors, so esentially that smaller pipe is part of your evaporator. Now measuring the pressure from this port on many different units i have found the saturated pressure of this line to be between 15-20c with the suction to
be within the 4-6c mark quite commonly. This is not all units but mainly 4-6hp side discharge Daikin units, whereas some other Daikin units i've tested this line saturation temp measured is around the SET.
Now my main question is where does the extra pressure loss come from in order to reduce to the lower SET? Could it just be part of the design process of piping within the indoor unit? And if so what are the advantages of a process such as this?
Originally i concluded the my gauge readings we're wrong, as there is a triple state flow of liquid, saturated liquid/vapour and vapour and thought gauge reading were only accurate reading a full state of liquid or vapour. But as soon as the line temp is measured this corresponds to the equivalent saturation temp.
Thanks in advance!
Concerning some smaller Daikin equipment in particular smaller sized residential ducted units. Basically they are metered outdoors, so esentially that smaller pipe is part of your evaporator. Now measuring the pressure from this port on many different units i have found the saturated pressure of this line to be between 15-20c with the suction to
be within the 4-6c mark quite commonly. This is not all units but mainly 4-6hp side discharge Daikin units, whereas some other Daikin units i've tested this line saturation temp measured is around the SET.
Now my main question is where does the extra pressure loss come from in order to reduce to the lower SET? Could it just be part of the design process of piping within the indoor unit? And if so what are the advantages of a process such as this?
Originally i concluded the my gauge readings we're wrong, as there is a triple state flow of liquid, saturated liquid/vapour and vapour and thought gauge reading were only accurate reading a full state of liquid or vapour. But as soon as the line temp is measured this corresponds to the equivalent saturation temp.
Thanks in advance!