The shell of the pressure vessel may safely be regarded as having an infinite lifetime, and door seals are expected to wear out eventually, but what of such things as the cooling coil?
32.
Also, instead of passing the cooling tower water through a strainer and then to the cooling coils, which causes fouling, more often a plate-and-frame heat exchanger is inserted between the cooling tower and chilled water loops.
33.
However, many window air conditioners are designed to dispose of condensate water by re-evaporating it into the exhaust air stream, which cancels out the air humidity decrease caused by the condensation of moisture on the cooling coils.
34.
So heating coils need not consider moisture condensation on their air-side, but cooling coils " must " be adequately designed and selected to handle their particular " latent " ( moisture ) as well as the " sensible " ( cooling ) loads.
35.
This was an example of water vapor ( from the air, from open liquids, veggies, ice cream, meat, etc ) freezing direcly from vapor phase ( gas ) to ice ( solid ) on the cooling coils, which were kept around-18 �C ( 0 �F ).
36.
Depending upon the selected chilled water temperatures and the relative humidity of the space, it is likely that the cooling coil will dehumidify the entering air stream, and as a by product of this process, it will at times produce a condensate which will need to be carried to drain.
37.
Because this inside air always has some amount of moisture suspended in it, the cooling portion of the process always causes ambient warm water vapor to condense on the cooling coils and to drip from them down onto a catch tray at the bottom of the unit from which it must then be routed outside, usually through a drain hole.
38.
A further factor in minimising injury at the reimplantation operations may have been that the kidneys were kept at 7 �C within the cooling coil, which was within a degree of the temperature used during perfusion storage, so that the kidneys were not subjected to the greater changes in temperature that would have occurred if ice cooling had been used.
39.
In a modern frost-free unit, I have seen the opposite happen : I fill the ice trays, go back a month later and there is only a fraction of the thickness of ice, because the automatic defrosting has melted the frost on the cooling coils and drained it away, but the solid ice has Edison 23 : 35, 16 October 2006 ( UTC)
