Gardner Denver APEX15-18A, Руководство по эксплуатации и обслуживанию

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SECTION 6
HEAT EXCHANGERS (OIL/AIR
)
OIL/AIR HEAT EXCHANGERS –
The heat of compression absorbed by the oil injected into the
compressors (for cooling and lubrication) is ultimately rejected in a convenient medium such as air - for
these air-cooled cores. Proper operation of the heat exchangers is essential for the following processes:
·
The oil core delivers a stable, cool (typically 131
°
F at 80
°
F ambient) supply of injection oil to the
compressor. Under these conditions, the oil core allows 5 gpm (19 lpm) oil flow with 10.2 psi
(pressure loss at 175psig discharge pressure. The standard (AEON4000) lubricating and cooling oil
must be kept at a normal operating temperature below 225
°
F in order to preserve its longevity.
·
The air core discharges 110 acfm of compressed air with 110psig of pressure and at a temperature
17
°
F above the ambient level at full load - 25hp package. Be aware that this temperature differential
(aka approach) may increase several degrees due to environmental conditions such as high ambient
temperatures and high ambient humidity.
VENTILATION CONFIGURATION – Air-cooled cores (radiator-type) are provided as standard feature.
One (1) axial fan, located behind the fresh air inlet grille, delivers an air stream to: a) cool the exterior of
the main electric motor and b) meet the cooling demands of the air/oil combination heat exchanger on its
way out the package confines. The fan is driven by a close-coupled, IP54-protected, electric motor which
includes its own overload protection. In addition, an open-weave, non-metallic mesh media is held in
place over the fresh air inlet grill to pre clean the cooling air stream.
Refer to Figure 6-1 for estimates of ventilation requirements. Please note that the air-cooled package
requires the combined total of the heat exchanger plus the enclosure ventilation flow rates (which include
motor ventilation and compressor intake). Furthermore, when package location makes it necessary to
duct fresh cooling air in/out, these ducts must be sized with a maximum (total) pressure loss of .1 inch
water gauge to avoid impacting the heat exchanger cooling air system. An external ventilation fan may
be required to properly evacuate hot air from the compressor room.
Minimum Cooling Air Flow Requirements
Model HP size CFM
15, 20, 25 2400
Figure 6- 1 – Air Flow Chart
HEAT EXCHANGER MAINTENANCE -
All the required hardware, mechanical and electrical connections
have been made at the Gardner Denver factory, thus the only regular maintenance required is to keep the
exterior core fins free from dirt and other airborne debris per the following procedure: