 |
Mechanical Specifications |
General
Unit shall be a complete double effect steam or hot water
fired absorption chiller package built in an ISO 9001 environment. The chiller shall
consist of a high temperature generator, low temperature generator/condenser section,
evaporator/absorber section, controls, pumps, heat exchangers, and steam control valve.
All units shall be of hermetic design, factory assembled and leak tested prior to
shipment. Units shall be capable of being separated and shipped disassembled for rigging
purposes or clearance limitations. The control panel, energy valve, and sensors shall be
factory installed. The unit is painted prior to shipping with two coats of a water base
air dry primer. The standard method of shipment shall be by truck from the USA.
Low Temperature Generator/
Condenser-Evaporator/Absorber
The shell material shall be carbon steel. Low temperature
generator and absorber tube material shall be cupronickel. Condenser tubes shall be
copper. Tubes shall be mechanically rolled into the tubesheets and replaceable from either
end. Condenser, evaporator and absorber tube supports shall be fixed. The low temperature
generator shall have fixed and floating tube supports to allow for even tube expansion.
Spray systems shall be replaceable from end of unit without sacrificing the hermetic
integrity of the unit.
Standard design working pressure for the water boxes shall
be 150 psig. All tube bundles shall be tested at 150 percent of design working pressure.
All waterboxes, except the second-stage generator, shall have gasketed removable covers
for access. Marine type waterboxes shall be provided on the condenser and absorber
section. Water connections shall be provided with either Victaulic™ or raised-face flanged
connections.
Heat Exchangers
Three welded hermetic plate solution heat exchangers shall
be provided to improve unit performance. Heat exchanger surfaces shall be 300 series
stainless steel.
Pumps
Solution and refrigerant with minimum 50,000 hour design
life shall be circulated by means of four hermetic, single stage centrifugal pumps. The
pump impeller shall be cast iron with a steel shaft. The motor bearings shall be
lubricated and the motor cooled by the fluid that is pumped. An adjustable frequency drive
shall be provided on the low temperature generator pump and absorber spray pump to provide
solution control.
Purge
The purge system shall include a collection chamber in the
absorber section, an eductor for moving non-condensables to the condenser, a Purifier™ purge to collect the
non-condensables in an external storage tank, and vacuum pump for removal of the
non-condensables. The purge shall operate automatically to remove non-condensables from
the unit during periods of chiller operation and shutdown. Logging of purge information
shall be provided via the unit control panel.
High Temperature Generator
The shell shall be carbon steel. Tube sheets are steel and
all generator tubes shall be constructed of stainless steel. The high temperature
generator shall have fixed and floating tube supports to allow for even tube expansion.
The steam side of the generator shall be designed and stamped for 150 psi ASME
construction. Unit high temperature generator shall include a rupture disk which is sized
to meet ANSI/ASHRAE B 15. The unit shall include a factory mounted and wired energy
control valve.
Unit Options
Unit options shall include:
• 300 psi waterboxes
• Marine-style waterboxes on the evaporator
• Industrial package - special tubing, lithium bromide
filter
• Disassembled unit
• Factory supplied insulation |
