marincarl
10-07-2007, 10:25 PM
May I present you with a bundle of strange
situations, as this marine installation is quite
remote of a refengineers dream, but resulting of
being merely forced to get and keep things going
to prevent spoiling of the food under way. The
refrigeration installation consists of a double
door domestic freezer-fridge which, despite shaken
about violently in a seaway performes best. in the
galley there are 2 Foster fridges and 1 freezer
press-fitted next to each other into a niche, no
clearance anywhere, the condensing units are
mounted on the bottom, air circulation is enhanced
by additional fans. The galley was unbearably hot,
much of the heat came from the ref-units,
performance was mediocre. I added water cooled
coils to the condensing circuits, the only
circulating water in the vicinity was the chilled
feedwater for the airhandler of the electronics -
battery room next door. I hacked a hole into the
fire retarding wall and stuck 3 water tubes
through it, 2 for circulation and 1 as drain for
the fridge units, using the condensate drain from
the air handler. Previously it was meant to
evaporate, in practice it spilled with every
movement of the ship, causing a mess on the galley
floor, which has no drain. Using the chilled water
on the galley fridges enhanced their performance
tremendously, the galley is a lot cooler, flow has
to be pinched however, not to get too cold (less
than 15°C) as the pressure difference accross and
refrigerant flow through the TEV's drop. The
normal temperature of the chilled AC water is at
9°C, fluctuates however frequently to 16°C, by
playing I found an acceptable adjustment. The air
cooled condensers I left in the circuit althogh
this can lead to re evaporation of some of the
refrigerant in the condensing unit, but so, even
with the AC failing, there is no imminent urgency.
To some of you this might look as a foul
compromise, but short of a mayor redesign little
can be done to improve it - can you prove me
wrong? Greetings from Tahiti, French Polynesia,
marincarl
situations, as this marine installation is quite
remote of a refengineers dream, but resulting of
being merely forced to get and keep things going
to prevent spoiling of the food under way. The
refrigeration installation consists of a double
door domestic freezer-fridge which, despite shaken
about violently in a seaway performes best. in the
galley there are 2 Foster fridges and 1 freezer
press-fitted next to each other into a niche, no
clearance anywhere, the condensing units are
mounted on the bottom, air circulation is enhanced
by additional fans. The galley was unbearably hot,
much of the heat came from the ref-units,
performance was mediocre. I added water cooled
coils to the condensing circuits, the only
circulating water in the vicinity was the chilled
feedwater for the airhandler of the electronics -
battery room next door. I hacked a hole into the
fire retarding wall and stuck 3 water tubes
through it, 2 for circulation and 1 as drain for
the fridge units, using the condensate drain from
the air handler. Previously it was meant to
evaporate, in practice it spilled with every
movement of the ship, causing a mess on the galley
floor, which has no drain. Using the chilled water
on the galley fridges enhanced their performance
tremendously, the galley is a lot cooler, flow has
to be pinched however, not to get too cold (less
than 15°C) as the pressure difference accross and
refrigerant flow through the TEV's drop. The
normal temperature of the chilled AC water is at
9°C, fluctuates however frequently to 16°C, by
playing I found an acceptable adjustment. The air
cooled condensers I left in the circuit althogh
this can lead to re evaporation of some of the
refrigerant in the condensing unit, but so, even
with the AC failing, there is no imminent urgency.
To some of you this might look as a foul
compromise, but short of a mayor redesign little
can be done to improve it - can you prove me
wrong? Greetings from Tahiti, French Polynesia,
marincarl