Oil Heaters

(see Table 6-4). One possible heating mode maintains the compressor frame at a minimum temperature so the compressor can start immediately if needed (see Table 6-1). Multiply the coefficients listed in Table 6-1 by the differential between target oil temperature and ambient temperature to obtain the kilowatt rating for a heater.

Another mode heats oil from ambient to a minimum temperature prior to starting (see Table 6-2). Multiply the coefficients listed in Table 6-2 by the rise in oil temperature and divide by target hours to obtain the kilowatt rating for a heater.

Ariel recommends circulation heaters for all units. JGZ:U:B:V, KBZ:U:B:V units use circulation heating only. Heated oil should circulate through the filter, bearings, and crossheads as well as the sump.

All other Ariel compressors have at least one heater connection; four and six throw frames have two. Maximum allowable watt density for an immersion heater is 15 W/in2 (2.3 W/cm2). This limit prevents oil coking on the heater element, which reduces heater efficiency and contaminates remaining oil