EVAPORATIVE COOLING AND HUMIDIFICATION - …

1 EVAPORATIVE COOLINGAND HUMIDIFICATIONEVAPORATIVE COOLINGAND HUMIDIFICATION Energy effi cient Provides both direct and indirect EVAPORATIVE COOLING Multiple zone capabilities in air handlers, ducts, and open spaces Complete water treatment options available from DriSteem Simple, reliable operationHigh-Pressure SystemWetted Media System2 EVAPORATIVE COOLING AND HUMIDIFICATIONA dvanced, effi cient COOLING and humidifi cationDirect EVAPORATIVE COOLING adds moisture to the supply air. Indirect EVAPORATIVE COOLING occurs in the heat exchanger without adding moisture.

2 A High-Pressure System is shown here. See page 14 for an illustration of direct/indirect COOLING using a Wetted Media SYSTEMWETTED MEDIA SYSTEMThe DriSteem Wetted Media System delivers EVAPORATIVE COOLING and humidifi cation to air handlers and ducts. The Vapor-logic controller's sophisticated water and scale management capabilities optimize water and media DriSteem High-Pressure System delivers EVAPORATIVE COOLING and humidifi cation to multiple zones in air handlers, ducts, and/or open spaces. The Vapor-logic controller provides comprehensive management of all system variables including water treatment and meeting tight space condition EFFICIENTE vaporative COOLING and humidifi cation systems draw heat from air to evaporate unheated water introduced by either high-pressure nozzles or wetted media.

3 This process raises the relative humidity (RH) level and lowers the dry bulb air temperature. Consequently, these systems humidify and cool air very effi ciently. REDUCES COOLING LOADAs water is absorbed in air, the EVAPORATIVE COOLING effect reduces the building's COOLING load. Twelve pounds of unheated evaporated water (vapor) reduces the COOLING load by about one ton, saving about 12,000 Btus. LOW MAINTENANCEHigh-Pressure and Wetted Media Systems are very low maintenance systems. The High-Pressure System's stainless-steel pump is designed to run for 8000 hours before its fi rst maintenance check, and the stainless-steel dispersion nozzles and manifolds are maintenance free.

4 High-Pressure System water treatment options available from DriSteem provide ultra-pure water that leaves no white dust. The reverse osmosis (RO) system automatically backfl ushes for extended membrane life. Wetted Media Systems recycle water, after it fl ows through the media, with robust centrifugal pumps. The Vapor-logic controller manages the concentration of dissolved solids in recirculated supply water to minimize scaling and lengthen media life. When required, new media cassettes easily drop in to place. DIRECT OR INDIRECT EVAPORATIVE COOLINGHeat exchanger with bypass dampers (both airstreams)Dispersion locationExhaustairOutsideairReturnairSup plyairExhaustfanSupplyfanHeating coilFinal evaporation mediaDispersion locationCooling coilIndirect EVAPORATIVE coolingDirect EVAPORATIVE coolingHumidifi cationFilterFinal evaporation mediaFilter3 EVAPORATIVE COOLING AND HUMIDIFICATIONF eatures and benefi tsFeatureHigh-Pressure SystemWetted Media SystemApplication versatilitySuitable for any application.

5 Commonly used in data centers, industrial manufacturing, printing facilities,and applications using air-side economizersAdvancedtechnologyMicro-turbi nes in precision-machined atomizing nozzles fragment water droplets into ultra-fi ne particles (90% are ten microns or less)Controller anticipates COOLING requirements, maximizes system on-time, monitors media performance and prompts for replacement, and provides temperature controlWater delivered to nozzles at up to 1200 psi ( MPa) requires no pressurized airWater concentration management maximizes media life and water utilizationIntegral check valve in nozzle ensures no dripping when system shuts offMultiple compact recirculation pumps provide redundancy with low system energy usageCooling effect saves energyEvery pound of atomized water absorbed in air removes approximately 1000 Btu of heat from the air (every kg absorbed removes approximately 2300 kJ of heat)

6 Signifi cant energy savings when COOLING and humidifying simultaneouslyUtility rebates can offset costsLowmaintenanceStainless-steel pump is cooled by purifi ed supply water; 8000 hours before maintenance checkUses potable water, eliminating water treatment maintenanceStainless-steel nozzles and manifolds require no maintenanceWater concentration management minimizes media scaling, extending media lifeThorough water fi ltration protects stainless-steel components from corrosion and undue wearEasy-to-replace media cassettes drop into frames in secondsFinal evaporation media as close as three feet ( m)

7 Downstream from heating coil prevents downstream wettingPowerful pumps keep solids in the holding tank in motion to be easily drained awayComprehensive system control with Vapor-logicAccurate, responsive RH control; PID control tunes system for maximum performanceSet up, view, and adjust system functions with intuitive keypad/display or Web interfaceIntegrates into any building automation system via Modbus and optional BACnet or LonTalk communication protocolsMultiple zonecontrol capabilityIndividual zone monitoring and modulated staging valves provide tight control in all zones with optimized absorption and minimal water waste Not availableOne system cools and humidifi es multiple zones with separate demandsVersatileCools and humidifi es in air handlers, ducts.

8 And open spacesCools and humidifi es in air handlers and ductsNozzle staging and pulsed modulation allow high turndown of system outputMedia staging and predictive operation allow high turndown of system output; stages can remain active while other stages are in dry-out modeCapacities up to 5500 lbs/hr (2495 kg/h), multiple systems can be combined for larger capacitiesMedia sizes from 4 ft2 ( m2) to 100 ft2 ( m2); multiple systems can be combined for larger capacitiesFlexibility to accommodate the most challenging applications; extensive network of DriSteem representatives available to assist with system layout and designComplete water treatment solutionWater treatment options available from DriSteem include RO hyperfi ltration, particulate fi ltering, dechlorination, and duplex water softeningNot requiredAutomatic back-fl ush technology ensures long RO membrane lifeUltra-pure water eliminates white dust fallout and bacteria/virus proliferation that can occur when using potable water4 EVAPORATIVE COOLING AND HUMIDIFICATIONHigh-Pressure System sequence of operation8 Humidifi ed zones.

9 One, two, or three stages per zone1 Municipalwater inlet2 Dechlorinator3 Duplex water softener1 Water enters system from municipal water supply2 Dechlorinator (wall-mounted on smaller models)3 Duplex water softener4 RO station with particulate fi lter and RO membranes5 Pressurized RO holding tank6 High-pressure pump station: All-stainless-steel axial-piston high-pressure pump delivers purifi ed, high-pressure water to atomizing nozzles Vapor-logic controller optimizes absorption in multiple humidifi cation zones7 Main water line feeds network of high-pressure, stainless-steel piping8 Humidifi ed zones.

10 Purifi ed, ultra-fi ne water droplets exit micro-turbine nozzles and disperse in AHUs, ducts, and/or open spaces9 Final evaporation media (shown on Page 10) installed downstream of AHU heating coil prevents downstream wettingZone 1controlcabinetTo solenoid valvesTo networkA COMPLETE SYSTEM THAT INCLUDES WATER TREATMENTZone 15 EVAPORATIVE COOLING AND HUMIDIFICATIONHigh-Pressure System sequence of operation4RO station: Particulate fi lter RO membranes6 High-pressure pump station: High-pressure stainless steel pump Vapor-logic controller7 Main water line5 Pressurized RO holding tankZone 2controlcabinetZone 3controlcabinetZone ncontrolcabinetTo networkTo networkTo networkTo solenoid valvesTo solenoid valvesTo solenoid valvesZone 2 Zone 3 Zone n6 EVAPORATIVE COOLING AND HUMIDIFICATIONHigh-Pressure System dimensionsTable 6-1.