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Petra Evaporative Condenser Rooftop Package Unit with Hermetic Scroll Compressors

Petra Evaporative Condenser Rooftop Package Unit with Hermetic Scroll Compressors

Differentiating from an air-cooled version that rejects heat to an AHRI 95°F ambient temperature, Evaporative condensers use a network of sprinkle cooling nozzles to spray water over the condenser coil that evaporates and cools the condenser air down toward a typical AHRI ambient wet bulb temperature of 75°F

This will result in rejecting heat to colder temperatures and thus, operating at a lower condensing temperature, which leads to lower compressor work and energy. In such operating conditions, evaporative condensing units operate at a lower condensing temperature and results in consuming 30–40% less electricity than comparable air-cooled units, especially at full load design conditions

Savings associated with evaporative Condensers lower energy consumption translates into lower electrical bills depending on the kW/Hr consumption rate in the area. Adding to the evaporative condenser savings, Petra offers multiple other cost effective and energy saving solutions that can contribute to an additional 15-25% energy saving

  • Premium Efficiency Motors
  • Airfoiled Blades Plenum AHU fans
  • EC Driven Plenum Fans
  • 8-row Deep DX-Coil for Optimal Performance
  • Energy recovery solutions that include: recovery wheels, sensible and enthalpy core plate heat exchanges, dehumidification wrap around heat pipe, recovery type heat pipe, run around recovery coils and dedicated DX circuit design
  • Walk-in service vestibule that includes compressors, water treatment unit, pumps and water accessories
  • The vestibule is fully encloses all above components and is made from 2” injected foam (3 PCF) panels that enhance sound attenuation and reduce noise emissions of the compressor and pumps
  • Compressors are high efficiency hermetic scroll type
  • Standard single width single inlet (SWSI) EC fans, statically and dynamically balanced controlled by unit microprocessor controller
  • Direct drive External rotor condenser fans made in one single assembly (fan, motor and grille). This eliminates service replacement expense and makes it easier to replace any fan assembly
  • Inlet air screens around the sump keep sunlight out and help prevent microbial growth
  • Structural welded galvanized steel C-channel base with full supporting cross members, equipped with screwed-in lifting lugs (eye bolts) of suitable loading capacity which are fitted on a welded bracket to the side of the C- channel
  • Double Wall G-90 galvanized steel injected with 2” foam, 3 pcf insulation density as minimum
  • Standard panels are galvanized steel thermally broken along full AHU circumference, stainless steel and aluminum panels are optional
  • Each panel uses a machine applied foam gasket that seals all around its edges and each door uses Clip-on PVC gasket
  • Paint is 5000 hours salt spray test certified according to (ASTM B117-07a) by ITS Semko/ETL
  • Condenser tube coil bundles are constructed of seamless corrosion-resistant copper tubes and stainless steel casing
  • The water sump is made from stainless steel. Sump includes make up water connection and drain connection as well
  • The spray chamber is constructed of corrosion-resistant stainless steel with in-fill media upstream and downstream of the condenser tube coil bundle. These in-fill media acts as an eliminator to minimize water consumption and an additional cooling media for the coil. The whole in-fill media is withdrawable from condenser side for cleaning or replacement
  • PVC spray system includes spray pump, water treatment connections and float control that automatically maintains acceptable water levels
  • NEMA 3X minimum panel enclosure with factory installed ALC controller with easy access user interface. Standard communicating control protocol is BACnet (IP or MSTP), Modbus or LonTalk as optional
  • Panel door has a door retainer to keep door open during service with a wiring diagram laminated copy inserted into the door pocket
  • Walk-in service vestibule that includes compressors, water treatment unit, pumps and water accessories
  • The vestibule is fully encloses all above components and is made from 2” injected foam (3 PCF) panels that enhance sound attenuation and reduce noise emissions of the compressor and pumps
  • Compressors are high efficiency hermetic scroll type
  • Standard single width single inlet (SWSI) EC fans, statically and dynamically balanced controlled by unit microprocessor controller
  • Direct drive External rotor condenser fans made in one single assembly (fan, motor and grille). This eliminates service replacement expense and makes it easier to replace any fan assembly
  • Inlet air screens around the sump keep sunlight out and help prevent microbial growth
  • Structural welded galvanized steel C-channel base with full supporting cross members, equipped with screwed-in lifting lugs (eye bolts) of suitable loading capacity which are fitted on a welded bracket to the side of the C- channel
  • Double Wall G-90 galvanized steel injected with 2” foam, 3 pcf insulation density as minimum
  • Standard panels are galvanized steel thermally broken along full AHU circumference, stainless steel and aluminum panels are optional
  • Each panel uses a machine applied foam gasket that seals all around its edges and each door uses Clip-on PVC gasket
  • Paint is 5000 hours salt spray test certified according to (ASTM B117-07a) by ITS Semko/ETL
  • Condenser tube coil bundles are constructed of seamless corrosion-resistant copper tubes and stainless steel casing
  • The water sump is made from stainless steel. Sump includes make up water connection and drain connection as well
  • The spray chamber is constructed of corrosion-resistant stainless steel with in-fill media upstream and downstream of the condenser tube coil bundle. These in-fill media acts as an eliminator to minimize water consumption and an additional cooling media for the coil. The whole in-fill media is withdrawable from condenser side for cleaning or replacement
  • PVC spray system includes spray pump, water treatment connections and float control that automatically maintains acceptable water levels
  • NEMA 3X minimum panel enclosure with factory installed ALC controller with easy access user interface. Standard communicating control protocol is BACnet (IP or MSTP), Modbus or LonTalk as optional
  • Panel door has a door retainer to keep door open during service with a wiring diagram laminated copy inserted into the door pocket
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