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Swimming Pool Environment Control SystemsSimultaneously monitors and controls humidity,water and air temperaturereduces running costs by up to 70%reduces carbon emissions i by up to 70%saves installation ti space and set up time8-pageFinal.indd 1 28/1/08 15:56:56

www.calorex.comTHE PROBLEM?Commercial and Municipal swimming pools give enjoymentand healthy exercise to millions of people but can be veryexpensive to operate.An expensive problem!There are many important factors to considerwhen planning and designing an indoorswimming pool. These include safeguardingthe building structure from dangerouscondensation, optimising the internalenvironment for the safety and comfort ofbathers and saving energy whilst minimisingrunning costs and CO2 emissions to thelowest possible levels for logical economicand environmental reasons.Maintaining a comfortable poolenvironment requires the pool water andair to be heated and held at approximately27°C and 29°C respectively. In many casesthis heating is normally carried out by heatexchangers via LPHW boilers using oil orgas as fuel.Commercial and Municipal swimming pools can bevery expensive to operateAs a result of continuous evaporation,uncomfortable warm humid air containingvast amounts of valuable heat in the formof latent energy must be removed from thepool hall in order to protect the pool buildingfrom destructive condensation and chemicaldamage whilst maintaining a safe andcomfortable leisure environment for bathers.Swimming pools continuously evaporate large volumesof moisture into the space around themExcessive energy lossOver the last 30 years or so various methodsof minimising heat losses have beenproposed. Most utilise some form offresh air handling unit (AHU) where heatexchange takes place between the warmmoist out-going air and the cooler incomingfresh air.False economy?Some manufacturers claim 100% efficiencyfor these units when fitted with a top upheat pump. Unfortunately this 100% refersto air heating only, with most of the energyrich moisture being driven out to atmosphereand the pool water regaining nothing at all.Key requirements for anIndoor pool:1 Water heatingA dangerous threatSwimming pools continuously evaporatelarge volumes of moisture into the spacearound them. Unless this moisture isremoved the humidity level will increase,creating not only an uncomfortable bathingenvironment but also leading to structuraland building fabric damage.In the days when energy was far lessexpensive than it is today, the normalmethod was to sweep out the humidityusing large quantities of heated fresh air.This is a continuous operation and energyconsumption is excessive and very costly.Heat losses include all of the pool latent andsensible energy which is not recovered andtherefore entirely wasted.2 Air heating3 Humidity control4 Air cooling5 Fresh air control8-pageFinal.indd 2 28/1/08 15:57:14

THE SOLUTION!Today’s answer to this problem is the Calorex HRD heatpumpdehumidifier - a completely automatic climate andenvironmental control unit.World leadersCalorex are the world’s leading manufacturerof swimming pool, environmental controlsystems that provide dehumidification, heatrecovery and ventilation solutions basedaround heat pump technology.A swimming pool environmental controlunit must carry out its primary task ofdehumidifying the pool hall air, be designedand constructed to withstand any poolair chemical condition and provide acontinuously modulated quantity of heatedor cooled fresh air for the comfort of users.Key points at a glance: Dehumidification with automaticallymodulating heat recovery to waterand airAutomatically modulating fresh airwith heat recovery to air and waterBuilt in LPHW, with controlthermostat and three way valve,for supplementary space heatingDynamic fresh air cooling withheat recovery to waterDouble skinned cabinetPurpose built to withstandswimming pool hall atmospheresChoice of fan pressure staticsBMS interface optionsThe Calorex solutionA Calorex HRD will provide the completeanswer to humidity control, water/airtemperature control and real time freshair requirements.By recovering the latent energy in themoisture laden air of a pool hall, yourCalorex HRD will return this energy to heatthe pool water or use it to assist with poolair heating.Furthermore, there is usually sufficientrecovered energy to provide all theoperational water heating requirements withany further surplus used for air heating.EnergyefficiencyandCO2 savingsHuge hikes in gas, electricityand water tariffs have added tens ofmillions of pounds of massive costs to thecountry’s annual community swimming bill.Consequently, local authorities and leisureoperators find themselves under morepressure than ever to demonstrate effectiveenergy efficiency.Calorex are the world’s leading manufacturer of swimming poolenvironmental control systemsCalorex systems can simultaneously carefor and preserve the building structure,reduce energy usage by up to 70% andlessen associated CO2 emissions by up to70% when compared to a conventionalfull fresh air ventilation system with crossplate heat exchanger. As the units are basedon heat pump technology, efficiencies arenormally around 300% which is well abovethe 50-60% normally offered by a crossplate heat exchanger.8-pageFinal.indd 3 28/1/08 15:57:15

www.calorex.comCASE STUDY:A leisure centre with a main pool of 25m x 13m and a learnerpool of 13m x 8.5m would enjoy emissions and energy costbenefits from Calorex HRD technology as follows:Comparative Energy Use per AnnumEnergy use – kWh per annum400000035000003000000250000020000001500000100000050000000FULL FRESHAIRCO2 Emissions per AnnumTonnes CO2 per annum8007006005004003002001000Gas regen heaterGas water heatingFULL FRESHAIRRECUPERATORAHUGas air heatingonly, building lossesnot includedRECUPERATORAHUAIR DESICANTAHUAIR DESICANTAHUCALOREXHRD30Electricity compressors& fans includedCALOREXHRD30DID YOU KNOW?CONTROLLING HUMIDITYA typical leisure pool can contain up to amillion litres of water heated to around30°C. Water evaporates from the surfaceat hundreds of litres every hour.Evaporated water needs to be removedor it will turn to condensation that willimmediately start to cause problems tothe building environment and fabric.The HRD contains all necessary sensingand control equipment within its cabinet.It will remove all of this moisture from theair, collect its latent energy and reuse it toassist water and air heating.Heat recovery from the unit is usuallysufficient to satisfy all of the operationalpool water heat requirements.By this means a heat cycle is created whichkeeps heating costs to a minimum.This also significantly reduces the carbonfootprint of the leisure centre.Clearly evident, the Calorex HRD30 guarantees minimal CO2 emissions(per annum) compared to the other processes tested.8-pageFinal.indd 4 28/1/08 15:57:23

HOW IT WORKS: Powerful circulation: Integral to the operation of the HRD is a powerfulcirculation fan which will, via appropriate ducting, ensure that all areas of the pool hall arefed with dehumidified air at the correct temperature.Independent compressor systemAn efficient refrigerated dehumidificationsystem operated by two independentcompressors, strips out the excessivemoisture, reclaims the latent energy andreplaces it into the pool water and air,along with all of the energy used to drivethe HRD.HEAT RECOVERY DEHUMIDIFICATIONFresh/stale air processingDuring dehumidification a Calorex HRD,operating at normal pool temperaturesrecovers 2kWh of latent heat from every 3litres of water condensed. Fresh air inletand stale air exhaust is catered for by anexhaust fan and motorised dampers.Moisture preventionExhaust air is driven out at a 10% - 15%higher rate than fresh air is introducedto create and maintain a slight negativepressure on the pool hall. By this means,moisture is prevented from being driveninto the building fabric.Bypass damper, fresh and exhaust air dampers: part openMaximum mechanical dehumidification in cool ambient conditions. Recovered heat energy intoboth water and air. Compressor 1 on high rate dehumidification. Recovered heat to air & water.Compressor 2 on heat recovery to water. Intermediate fresh air rate.AIR CONDITIONINGBypass damper: closedPool hall heat managementAn automatically controlled air heaterbattery is integrated into the unit to allowfor pool hall heat variations. Provision isalso made for substantial air cooling so asto negate excessive heat loads.Fresh and exhaust air dampers: fully openThe unit is shown in Air Conditioning Mode. The pool water, which has first choice of theremoved energy, is satisfied as is the pool hall air. The energy is therefore being rejectedto atmosphere. Compressor 2 on air conditioning. Displaced heat via exhaust to atmosphere.Maximum fresh air rate.8-pageFinal.indd 5 28/1/08 15:57:24

www.calorex.comCASE STUDY:continued...To further enhance energy conservation and efficiencyexhaust air is passed through a heat recovery unit to stripout latent and sensible energy.>>>>>>>>POOL WATER AND AIR HEATING AND/OR COOLINGThe majority of pool water and air heating needs can be provided from thedehumidification process.A fully controlled LPHW air battery will replace any unrecoverable pool air heat via the buildingfabric etc. A further option is that this LPHW coil can be supplied to operate with chilled watergiving controlled pool air cooling. A control interface connection to drive a motorised valve feedingan external calorifier for initial and top up pool water heating is available from the control panel.FRESH AIR / AIR HANDLINGThe HRD range is fitted with an automatic, modulating fresh / exhaust air system. This systemcontinuously and automatically provides an optimum pool air condition regardless of pool duty;it provides a greater degree of air temperature control during warm weather and ensures aslight negative pressure is maintained within the pool hall.By this means, all building air leakage is inwards, safeguarding the building from the effects ofairborne chemicals and preventing the migration of pool air into adjoining rooms.During cold weather, energy is recovered from the exhaust air to reheat the incoming fresh airsupply. This process will reverse during hot weather to cool the incoming fresh air and maintaina comfortable temperature within the pool hall.A CO2 / air condition monitor is available as an optional extra and this can also be retro fitted toexisting units.OPERATIONAL CONTROLSThis range is available with either a conventional control panel or a Satchwell BMS controlsystem. This is contained within the unit together with all necessary temperature and humiditysensors and a diagnostic light panel showing operating modes and conditions.Close control is maintained over pool water temperature, pool air temperature and relativehumidity and a 7 day time clock is included to allow the pool air to be “set back” to a lowertemperature when a pool cover is in place.RANGEThe HRD series consist of four models,the HRD 15, 20, 25 and 30 covering airflow capacities from 6000 to 36000 cubicmetres per hour.An HRD is capable of the completecontrol of all sizes and capacities of allcommercial and municipal swimmingpools and water leisure centres.To further enhance energy conservationand efficiency, exhaust air is passedthrough a heat recovery unit that stripsout latent and sensible energy beforerejecting the air to outside. From thisprocess, incoming fresh air is preheatedin the winter and cooled in the summer.Where spectator numbers exhibit largevariations a further optional extraavailable is a CO2 monitor which enablesthe HRD to respond more quickly tochanges in CO2 loading. All units haveprovision for this facility so it can easilybe retro fitted if deemed necessary.All steelwork is galvanised and thepanels, which are all removable formaintenance, are double skinned andinsulated. They are located by rapidrelease fasteners for easy access andhave plastic coated surfaces for aestheticappearance and additional protection.8-pageFinal.indd 6 28/1/08 15:57:26

SPECIFICATION: HRD Systems data sheetPool hall Air Temp at 28°C / Relative Humidity at 60% HRD15 HRD20 HRD25 HRD30Dehumidification CapacityOutside air at 29°C DB/20°C WBBy refrigeration Litre/HR 31 45 68 88TOTAL Litre/HR 63 116 152 210Heat Output to Water at 26°CUnder maximum demand (mode A) kW 40 60 95 117Under maximum demand (mode B) kW 5 8 18 25Heat Output to Air at 28°C 60% RHUnder maximum demand (mode A) kW -10 -15 10 14Under maximum demand (mode B) kW 37 55 72 90Additional Heat Output toAir at 28°C 60% RH by LPHW BatteryWater on at 80°C kW 0-70 0-100 0-150 0-210Sensible Air Cooling Mode ModeAt 29°C ‘Air-On’ @ 60% RH kW -20 -30 (A) -49 or (B) -30 (A) -67 or (B) -37Recirculating Air Flow m 3 /h 12000 19500 25000 35000@ Max External Total Pressure Pa 250* 250* 300* 300*Max Fresh Air Introduction m 3 /h 6000 13500 18000 25000@ Max External Total Pressure Pa 100 100 100 60Nominal Power Installed(Dependent upon main fan duty) kW 17 23 31 44Weight Kg 1100 1400 2950 2980Mode A = Recovered heat biased to pool water. (Pool water temperature not satisfied) Default State Mode B = Recovered heat biased to pool Air (Pool water temperature not satisfied)Note: ‘Nominal Power Installed’ is the sum of the electrical motor ratings at full duty. Actual power consumption is dependent upon the level of swimming pool activity* The nominal operating pressure can be increased or decreased to match the requirements of the installation8-pageFinal.indd 7 28/1/08 15:57:27

30YEARS1977-2007Technical support and service:Comprehensive engineering support is providedby our experienced and well qualified teamtel +44 (0)1621 856611www.calorex.comCOMPREHENSIVE SUPPORTThe HRD is designed and manufactured atour head office facility in Maldon Essex andis supported by our comprehensive customerservice organisation.To ensure equipment is correctly sized andspecified, we offer a computerised quotationservice which enables an accurate speedyresponse to enquiries.Comprehensive engineering supportis provided by our experienced andwell qualified team and the units arecommissioned by Calorex engineers.HRD.v.28-pageFinal.indd 8 28/1/08 15:57:29