Baltimore (NH3) Hybrid condenser HXC
Baltimore (NH3) Hybrid condenser HXC
(OP)
Hello!
We are going to install 3 hybrid condensers HXV for condensing NH3. These are equipped with one (dry) finned tubes section at the top and with a (normally wetted) tube section below. During cold periods main load shall be covered by the dry section. During hot periods the normal wetted section shall take the total load.
The connection of both sections is not done by supplier but will be done by ourselves. Supplier suggests to connect both sections in serial; NH3 gas enters at the top, outlet of this finned tube section is connected to wet tube section gas inlet and outlet of this is connected to vessel.
I prefer to connect both sections in parallel. (BTW: We know about principal routing of refrigerant pipes especially at parallel condensers)
What do you think of it? Parallel or serial and why?
Kind regards
virk
We are going to install 3 hybrid condensers HXV for condensing NH3. These are equipped with one (dry) finned tubes section at the top and with a (normally wetted) tube section below. During cold periods main load shall be covered by the dry section. During hot periods the normal wetted section shall take the total load.
The connection of both sections is not done by supplier but will be done by ourselves. Supplier suggests to connect both sections in serial; NH3 gas enters at the top, outlet of this finned tube section is connected to wet tube section gas inlet and outlet of this is connected to vessel.
I prefer to connect both sections in parallel. (BTW: We know about principal routing of refrigerant pipes especially at parallel condensers)
What do you think of it? Parallel or serial and why?
Kind regards
virk





RE: Baltimore (NH3) Hybrid condenser HXC
One company I worked for designed several evaporative cooled units with the top abatement coil.
Ken
Ken
KE5DFR
RE: Baltimore (NH3) Hybrid condenser HXC
We eventually reworked some of these so a select portion of the finned section, over just the center 25% of the wet coil, was incorporated into a "low flow" distribution pan, which kept the water warm and let it trickle down the center-only of the wet coil...These were the only condensers we could apply any water to at outdoor temperatures of -10 F. and the scale scenario was not as bad as you might anticipate.
RE: Baltimore (NH3) Hybrid condenser HXC
Main problem was a total pressure drop of 300 mbars of the condenser if it was connected in series. BAC now has connected the top coil in parallel, total pressure drop now is now said to be less than 100 mbars. I think we can connect them in series now, so as BAC advises.
BTW: We do not need the top coil for desuperheating purposes: ammonia gas already enters with about 40°C into the condenser.
Thanks to all who have helped!
Kind regards
virk