nevinjohn
24-03-2017, 07:12 AM
Hi,
I'm designing couple of fresh air units for some class rooms. Since the capacity (air requirement) is limited, I need to go for ceiling suspended fresh air units, preferably VRFs.The ambient here is 47DBT/35WBT as per clients design standards. I spoke with many VRF vendors, where they told me that their equipment, a.k.a OUTDOOR UNIT is designed for 54deg C. Thats a good thing for me, however the ON COIL temperature for INDOOR UNIT is only at 43/35 deg C.
I did the psychometric load calculations to determine the indoor unit size considering on coil @ 47DBT/35WBT and off coil @ 21DBT/WBT. My question is, whether can I rely on these indoor units?
Lets say, I derived at 3TR @ my design temperature, would it deteriorate @ vendors (lets say Daikin's) off coil temperature? I believe @ vendors offcoil, it should still be able to give me 25 deg off coil??
Thanks!
Nevin.
I'm designing couple of fresh air units for some class rooms. Since the capacity (air requirement) is limited, I need to go for ceiling suspended fresh air units, preferably VRFs.The ambient here is 47DBT/35WBT as per clients design standards. I spoke with many VRF vendors, where they told me that their equipment, a.k.a OUTDOOR UNIT is designed for 54deg C. Thats a good thing for me, however the ON COIL temperature for INDOOR UNIT is only at 43/35 deg C.
I did the psychometric load calculations to determine the indoor unit size considering on coil @ 47DBT/35WBT and off coil @ 21DBT/WBT. My question is, whether can I rely on these indoor units?
Lets say, I derived at 3TR @ my design temperature, would it deteriorate @ vendors (lets say Daikin's) off coil temperature? I believe @ vendors offcoil, it should still be able to give me 25 deg off coil??
Thanks!
Nevin.