VCL

General

A. General: Furnish and install, _____ factory assembled evaporative condenser(s) of counterflow blow-through design, with single side entry, conforming in all aspects to the specifications and schedule as shown on the plans. The condenser shall be of unitary design with all moving parts factory mounted and aligned.

B. Capacity: The evaporative condenser(s) shall be warranted by the manufacturer to have condensing capacity of _____ kW heat rejection, operating with ____ refrigerant and ___ºC condensing temperature and ___ºC entering wet-bulb temperature.

C. Warranty: The manufacturer’s standard equipment warranty shall be for a period of one year from the date of startup or eighteen months from the date of shipment, whichever ends first.

D. Quality Assurance: The manufacture shall have Management System certified by an accredited registrar as complying with the requirements of ISO-9001 to ensure consistent quality of products and services.

Products

1.0 Evaporative Condenser - Materials and Construction

1.0 General: All steel panels and structural elements shall be constructed from heavy-gauge, hot-dip galvanized steel, with cut edges given a protective coating of zinc-rich compound.

2.0 Coil Assembly                  

The heat transfer section shall be integral to the pan section to facilitate rigging and shall include the coil below a spray water distribution system and drift eliminators.

2.1 The refrigerant condensing coil shall be fabricated of all prime surface steel at the manufacturer’s own facility, and hot-dip galvanized after fabrication.
a. The refrigerant condensing coil shall be tested at 34 bar air pressure under water.
b. The refrigerant condensing coil shall be designed for low pressure drop with sloping tubes for free drainage of liquid refrigerant.
c. The refrigerant condensing coil shall be according to European Pressure Equipment Directive 97/23/EC.

2.2 Water shall be distributed evenly over the coil at a minimum flow rate sufficient to ensure complete wetting of the coil at all times by large-diameter, non-clog, 360° plastic distribution nozzles spaced across the coil face area in plastic material spray branches. Nozzles shall utilize a two-stage diffusion pattern to provide overlapping, umbrella spray patterns that create multiple intersection points with adjacent nozzles.
Spray branches and nozzles shall be held in place by snap-in rubber grommets, allowing quick removal of individual nozzles or complete branches for cleaning or flushing.

2.3 Removable plastic material drift eliminators shall be positioned to prevent moisture from leaving the evaporative condenser and incorporate a minimum of three (3) changes in air direction.

3.0 Pan Assembly   

The evaporative condenser shall include a pan assembly consisting of cold water basin with pump assembly and fan assemblies with single side air inlet.

3.1 The cold water basin shall include: a drain/clean-out connection; a steel strainer; a brass make-up valve; overflow connection; and a water recirculation pump assembly.
a. Drain/cleanout connection shall be located in the cold water basin to allow removal of recirculating water.
b. Lift-out steel strainer shall be supplied with perforated openings sized smaller than the water distribution nozzle orifices and an integral anti-vortexing hood to prevent air entrainment.
c. Brass make-up valve shall be supplied with a large-diameter plastic float arranged for easy adjustment.
d. Overflow connection shall be provided in the cold water basin to protect against recirculating water spillage.
e. Water recirculation pump shall be a close-coupled, bronze-fitted centrifugal pump equipped with a mechanical seal, mounted on the basin and piped from the suction strainer to the water distribution system.
i. The pump shall be installed so that it may drain freely when the basin is drained.
ii. The pump assembly shall include an integral metering valve and bleed line to control the bleed rate from the pump discharge to the overflow connection.
iii. The pump motor shall be totally enclosed fan cooled (TEFC) type suitable for _____ V, ____ phase______ Hz electrical service.
f. On installations requiring a remote sump, the evaporative condenser shall be modified to accommodate the use of an independent sump and pump for recirculating water (by others)
i. The recirculating water pump, steel strainer, make-up valve, and integral bleed line assemblies shall be omitted from the evaporative condenser scope of supply.
ii. The evaporative condenser shall be supplied with a cold water basin outlet sized and located as indicated on the drawings for gravity drain to the remote sump.
iii. The water distribution system shall have an operating pressure of 14 kPa at the evaporative condenser spray water inlet connection.

3.2 Air shall enter the evaporative condenser through the centrifugal fan assemblies.
a. Fans and motors shall be located in the dry entering airstream to provide greater reliability and ease of maintenance.
b. Fan housings shall have curved inlet rings for efficient air.entry.
c. Fan(s) shall be heavy-duty, centrifugal flow type mounted on a steel shaft with heavy-duty, self-aligning, relubricatable bearings with cast iron housings, designed for a minimum L10 life of 40 000 hours.
d. Fan motor(s) shall be totally enclosed fan cooled (TEFC) type, suitable for _____ V, ____ phase, ______ Hz electrical service and shall be mounted on an easily adjusted, heavy-duty motor base. Special moisture protection shall be furnished on the windings, shafts, and bearings.

4.0 Optional Equipment Specifications

A. Evaporative condenser shall be provided with basin heaters to prevent freezing of the water in the cold water basin when the evaporative condenser is idle.

1. The basin heaters shall be selected to maintain +4°C basin water temperature at -18°C ambient temperature.

2. Basin heaters shall be electric immersion type controlled by a remote thermostat with the sensing bulb located in the basin water.

3. Basin heaters shall be provided with a factory-installed low water level cutout switch to prevent heater operation unless the heater elements are fully submerged.

B. Evaporative condenser shall be supplied with the Baltiguard® Drive System to improve part load efficiency and provide system redundancy in case of a motor failure.
1. The Baltiguard® Drive System shall include the main fan motor as listed in the manufacturer’s published literature and a pony motor sized for approximately 1/3 of design kW and 2/3 of design fan speed to optimize energy savings during non-design load conditions.

5.0 Sound                       

5.1 Sound Level: To maintain the quality of the local environment, the maximum sound pressure levels (dB) measured 15 m from the condenser operating at full fan speed shall not exceed the sound levels detailed below.

Need more information? Contact your local BAC representative.