The volumetric flow of the cooling water is reg B4-KH-14-A Bevel-helical speed reduction gearboxes B4

Flender/Flender Gear Units/Bevel-helical speed reduction gearboxes B4

urpose of the project Liquid chillers are usually used as accessories in airconditioning systems In air-conditioning and refrigerating stems, liquids are chilled using not only the safe refrigerants CFC 1 1 and 1 2 ( 1, , but aio the -CFC 2 ( Although 2 has an ozone-depleting potential (ODP)of,,only" 0andwasthus regardedasoneoftherefrigerantsofthefuture,theGerman Ordinance Concerning Ban on CFC Halons, dated 0 0 1, stipulates thatthis refrigerant may no longer be used in new systems as of 0 0 2 The goal of this project was to bring the refrigerant NH3 (ammonia) - which has been used from the very beginning of mechanical refrigeration until today - back into air-conditioning and refrigerating systems as suitable alternative refrigerant for chilling liquids in view of the fact that it has no ozone-depleting potential 2. Working steps The orototwe was oriainallvto befitted with shell-and-tube condenserand shell-and-tube - eva 'oratoi'Condens3ion was to be achieved using cooling water, which can be taken from cooing tower in practical operation The shell-and-tube evaporator was to include an interme- diatecircuit to plate heat exchanger which, in turn, was to be connected to the coldwater sys- tem of the air-conditioning installation The urpose of the intermediate circuit was to ensure non-ferrous metals Working on the basis of the original concept, thought was iven to selecting suitable heat exchangers so that the refri erant char could be minimisec?to such degree that the liquid chillercould also beinstallec?in buildingzasements incom Iiancewith therequirementsof Art 1 of German Accident Prevention Regulations UVV 2 TRis presupposesa maximum charge It was found in this context that the conventional designs of shell-and-tube apparatus were unsuitable for this task that,intheeventofa leak,noammonia coul8pass intothecold-watersystem,whichcontained __ ~ ~ ~ ~ . of 5 kg. 3. Results The ammonia-charge liquid chiller with plate heat