ice chiller appguide

8/13/2019 Ice Chiller AppGuide

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ICECH

ILLER

Baltimore Aircoil

COOLING

TOWERS

EV

APORATIVE

CO

NDENSERS

CLOSEDCIRCUIT

COOLING

T

HERMAL

STORAGE

S156/1-OCA


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LOAD PROFILEA daily load profile is the hourbyhour representation

of cooling loads for a 24hour period. Most HVACapplications use a daily load profile to determine theamount of storage required. Some HVAC systemsapply a weekly load profile. For conventional aircon-ditioning systems, chillers are selected based on thepeak cooling load. For ice storage systems, thechillers are selected based on the tonhours of cool-ing required and a defined operating strategy.Thermal storage systems provide much flexibility forvarying operating strategies as long as the totaltonhours selected are not exceeded. This is why anaccurate load profile must be provided when design-ing an ice storage system.

Load profiles take many different shapes based onthe application. Figure 1 illustrates a typical HVACload profile for an office building with a 500ton peakcooling load and a 12hour cooling requirement. Theshape of this curve is representative of most HVACapplications. For preliminary equipment selections,BACs ICE CHILLER Thermal Storage Unit SelectionProgram can generate a similar load profile.Information required is the estimated building peakcooling load and duration of the cooling load.

The AirConditioning & Refrigeration Institute (ARI)has published Guideline T, Specifying the ThermalPerformance of Cool Storage Equipment. The pur-pose of Guideline T is to establish the minimum userspecified data and supplier specified performancedata. Design data provided by the engineerincludes: System Loads, Flow Rates andTemperatures. Table 1 details the user specifieddata.

TABLE OF CONTENTSLoad Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Operating Strategies . . . . . . . . . . . . . . . . . . . . .2

Modes of Operation . . . . . . . . . . . . . . . . . . . . . .3

System Schematics . . . . . . . . . . . . . . . . . . . . . .4

Chiller Performance . . . . . . . . . . . . . . . . . . . . . .5

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Unit Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Water Treatment . . . . . . . . . . . . . . . . . . . . . . . . .8

Winterization . . . . . . . . . . . . . . . . . . . . . . . . . . .8Pressure Drop . . . . . . . . . . . . . . . . . . . . . . . . . .8

Product Specifications . . . . . . . . . . . . . . . . . . . .9

Engineering Data . . . . . . . . . . . . . . . . . . . . . . .10

INTRODUCTION

Thermal storage, because of its lower first cost

and lower operating cost is an excellent answer to

the increasing cost of installing and operating

todays air conditioning systems. With over 2,200

successfully operating ice storage installations

worldwide, BAC has the application and system

experience to assist you in the design, installation

and operation of your ice storage system. This

Application Guide will briefly review system

design, installation and operation of BACs modu-

lar ICE CHILLER Thermal Storage Units. By

understanding the glycol system design and com-

pleting the Thermal Storage User Specified DataSheet provided, you will have started a process

which will result in another successful BAC ice

storage system.

1

Figure 1Typical HVAC Load Profile


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OPERATING STRATEGIESThe next step in selecting thermal storage equipment isto define an operating strategy. Choices include eitherfull or partial storage. Partial storage operating strate-gies can be categorized as either demand limiting orload leveling. The operating strategy used is depen-dent upon the load profile, utility rate structure, energycost and equipment first cost.

Full storage systems eliminate the need to operate thechiller during the utility onpeak period by storing therequired cooling capacity during offpeak periods.

This strategy shifts the largest amount of electricaldemand and results in the lowest operating costs.However, the equipment first cost is considerablyhigher than partial storage systems due to largerchiller and storage requirements.

Unlike full storage systems, the chiller must operateduring the onpeak period when a partial storage oper-ating strategy is used. There are two types of partialstorage operating strategies. The first is demand limit-ing. With the demand limiting operating strategy, thenonstorage system loads establish the peak demand

for the facility. Items that contribute to the nonstoragesystem loads include lights, equipment, appliances,fans, motors etc. The thermal storage equipment isselected so the chiller operation does not increase thefacilitys nonstorage demand. This operating strategyprovides the lowest operating costs for partial storagesystems. This strategy also requires less storagecapacity and smaller chillers than a full storage design.The disadvantages of the demand limiting operatingstrategy are that the storage requirement and chillercapacity are larger than required for a load levelingoperating strategy. This results in a longer paybackperiod.

The second partial storage operating strategy is loadleveling. By distributing the cooling load equally over a24hour period, this operating strategy reduces thesize of the thermal storage equipment and chiller whencompared to either full storage or demand limitingstrategies. This results in the lowest possible first costand shortest payback period. Since the chiller oper-ates fully loaded during the onpeak period, operatingcosts are higher than either demand limiting or full stor-age operating strategies.

2


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MODES OF OPERATIONThe modular ICE CHILLER Thermal Storage Unit canoperate in any of five distinct operating modes. Thesemodes of operation provide the flexibility required bybuilding operators to meet their daily HVAC coolingrequirements.

ICE BUILD In this operating mode, ice is built bycirculating a 25% solution (by weight) of inhibited eth-ylene glycol through the coils contained in the ICECHILLER Thermal Storage Unit. Figure 2 illustratestypical chiller supply temperatures for 8, 10 and 12hour build cycles. For a typical 10hour build time,the supply glycol temperature is never lower than22F. As the graph illustrates, for build times exceed-ing 10 hours, the minimum glycol temperature isgreater than 22F. For build times less than 10 hours,the minimum glycol temperature will be lower than22F at the end of the build cycle. This performanceis based on a chiller flow rate associated with a 5F

range. When a larger temperature range is the basisof the chiller selection, the chiller supply temperatureswill be lower than shown in Figure 2.

ICE BUILD WITH COOLING When cooling loadsexist during the ice build period, some of the coldethylene glycol used to build ice is diverted to thecooling load to provide the required cooling. Theamount of glycol diverted is determined by the build-ing loop set point temperature. BAC recommendsthat this mode of operation be applied on systemsusing primary/secondary pumping. This reduces the

possibility of damaging the cooling coil or heatexchanger by pumping cold glycol, lower than 32F,to this equipment.

COOLING ICE ONLY In this operating mode thechiller is off. The warm return ethylene glycol solutionis cooled to the desired set point temperature bymelting ice stored in the modular ICE CHILLER

Thermal Storage Unit.

COOLING CHILLER ONLY In this operatingmode the chiller supplies all the building coolingrequirements. Glycol flow is diverted around the ther-mal storage equipment to allow the cold supply glycolto flow directly to the cooling load. Temperature setpoints are maintained by the chiller.

COOLING ICE WITH CHILLER In this oper-ating mode, cooling is provided by the combinedoperation of the chiller and thermal storage equip-ment. The glycol chiller precools the warm returnglycol. The partially cooled glycol solution thenpasses through the ICE CHILLER Thermal StorageUnit where it is cooled by the ice to the design tem-perature.

1 2 3 4 5 6 7 8 9 10 11 12

BUILD TIME (HOURS)

0

27

26

25

24

23

22

21

20

10 HOURS

12 HOURS

8 HOURS

3

Figure 2Chiller Supply Temperatures


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SYSTEM SCHEMATICSTwo basic flow schematics are applied to selectBACs ICE CHILLER Thermal Storage Units. Figure 3illustrates a single piping loop with the chiller installedupstream of the thermal storage equipment. This

design allows the thermal storage system to operate infour of the five possible operating modes. They areIce Build, Cooling-Ice Only, Cooling-Chiller Only andCoolingIce With Chiller. For this schematic the follow-ing control logic is applied:

MODE CHILLER P1 V1 V2

Ice Build On On AB AB

CoolingIce Only Off On Modulate AC

CoolingChiller Only On On AC AC

CoolingIce With Chiller On On Modulate AC

Valve V-1 modulates in response to temperature sen-sor, TS-1. Valve V-2 could be positioned to eithermaintain a constant flow, less than P-1, or modulate inresponse to the return glycol temperature from thecooling load.

When the building loop contains chilled water, a heatexchanger must be installed to separate the glycolloop from the buildings chilled water loop. On appli-cations where an existing water chiller is available, itcan be installed in the chilled water loop to reduce theload on the thermal storage system.

This design should not be used when there is arequirement to build ice and provide cooling. Thiswould require the cold return glycol from the thermalstorage equipment be pumped to the cooling load orheat exchanger. Since the glycol temperature isbelow 32F, the cooling coil or heat exchanger is sub-ject to freezing.

The flow schematic illustrated in Figure 4 details a pri-mary/secondary pumping loop with the chiller locatedupstream of the thermal storage equipment. Thisdesign allows the system to operate in all five operat-

ing modes. For this schematic, the following controllogic is applied:

MODE CHILLER P1 P2 V1 V2

Ice Build On On Off AB AC

Ice Build With Cooling On On On AB Modulate

CoolingChiller Only On On On AC AB

CoolingIce Only Off On On Modulate AB

CoolingIce with Chiller On On On Modulate AB

Valve V-1 and Valve V-2 modulate, depending on theoperating mode, in response to temperature sensor,TS-1. The benefit provided by the primary/secondarypumping loop is that the system can build ice and pro-vide cooling without fear of freezing a cooling coil orheat exchanger. This system design also allows for dif-ferent flow rates in each of the pumping loops. When

the flow rates in the pumping loops are different, theglycol flow rate in the primary loop should be greaterthan or equal to the glycol flow rate in the secondaryloop. As in the single loop schematic, a heatexchanger and a base water chiller can be added tothe system schematic.

Variations to these schematics are possible but theseare the most common for thermal storage systems.One common variation positions the chiller down-stream of the thermal storage equipment. Thisdesign is used when the glycol temperatures off theice cannot be maintained for the entire cooling peri-od. By positioning the chiller downstream of the ice,the chiller is used to maintain the required supplytemperature. In Figure 3 and Figure 4, the chiller isinstalled upstream of the ice. This offers two signifi-cant advantages compared to system designs thatlocate the chiller downstream of the ice. First, thechiller operates at higher glycol temperatures to pre-cool the return glycol. This enables the chiller tooperate at a higher capacity which reduces theamount of ice required. Second, since the chiller isoperating at higher evaporator temperatures, the effi-ciency (kw/TR) of the chiller is improved.

4

Figure 3

Single Loop Chiller Upstream

Figure 4Primary/Secondary Pumping Loop

Chiller Upstream


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CHILLER PERFORMANCEMost packaged chillers can provide a wide range ofglycol discharge temperatures and are suited for ther-mal storage applications. Chiller types applied tothermal storage applications include reciprocating,rotary screw and centrifugal. The chiller type useddepends on capacity, glycol discharge temperature,

efficiency, condenser type, and refrigerant. Chillercapacity (tonnage) and glycol discharge temperaturemust be evaluated when designing a thermal storagesystem. Different glycol discharge temperatures arerequired for various operating modes which affect thechiller capacity. The chiller tonnage provided at 22Fis considerably less than the chiller tonnage with a44F glycol discharge temperature.

Chillers selected for use with the BACs ICECHILLER Thermal Storage Units should be able toprovide 22F glycol when applied to a 10-hour buildcycle. Longer build times result in higher glycol tem-

peratures at the end of the build period while shorterbuild times require the chiller to supply glycol colderthan 22F.

The chiller tonnage required could limit the use of aspecific chiller type on small applications. The nomi-nal tonnage range for each chiller type is shown inthe table below.

CHILLER TYPE NOMINAL TONNAGE RANGE

Reciprocating 10 - 240

Rotary screw 120 - 1,200

Centrifugal 160 - 2,000+

Centrifugal and rotary screw chillers have the highestefficiencies with ranges from 0.6 to 0.75 kW/ton at44F chiller discharge temperature and 0.87 to 1.1kW/ton when providing 22F glycol. Reciprocatingchillers are less efficient and have efficiencies rang-ing from 0.85 to 1.1 when providing 44F glycol and1.1 to 1.3 kW/ton when making ice at 22F.

The heat rejection function of an ice storage systemcan be handled by any of three types of refrigerantcondensers: aircooled, water-cooled or evaporative.

An aircooled condenser removes heat from therefrigerant and condenses it by forcing air over anextended surface coil through which the refrigerantvapor is circulated. The latent heat of the refrigerantis removed by sensibly heating the air. The con-denser capacity is determined by the ambient drybulb temperature.

A water-cooled condenser with a cooling towerrejects heat from a refrigeration system in two steps.First, the refrigerant is condensed by the water flow in

the condenser. Second, heat is rejected to theatmosphere as the condenser water is cooled by acooling tower.

The evaporative condenser combines a watercooledcondenser and cooling tower in one piece of equip-ment. It eliminates the sensible heat transfer step ofthe condenser water. This allows a condensing tem-

perature substantially closer to the design wetbulbtemperature.

Variations in condensing temperatures should be con-sidered when evaluating chiller performance.Reduced nighttime ambient dry bulb and wet bulbtemperatures offer lower condensing temperatureswhich help offset the reduction in chiller capacity andchiller efficiency.

The percent of nominal chiller capacity at variousglycol discharge temperatures are shown below.Nominal capacity of the chiller is based on coolingwater to 44F.

Nominal capacity ratings are based on:85F condenser water or 115F condensing tempera-ture for cooling operation

80F condenser water or 105F condensing tempera-ture for ice build operation

The refrigerant types for chillers also vary. Centrifugalchillers are available for use with R-134a, R-123 andR-22. Reciprocating and rotary screw chillers areavailable for use with R134a, R-22 and R-717(ammonia).

GLYCOL DISCHARGE

TEMPERATURE

44F

36F

22F

PERCENT OF

NOMINAL CAPACITY

97%

85%

66%

5


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INSTALLATIONICE CHILLER Thermal Storage Units must beinstalled on a continuous flat level surface. The pitchof the slab must not exceed 1/8" over a 10foot span.Figure 5 details ICE CHILLER Thermal Storage Unitlayout guidelines. The units should be positioned sothere is sufficient clearance between units and adja-

cent walls to allow easy access. When multiple unitsare installed, a minimum of 18" is recommended side-to-side and 3'-0" end-to-end for access to the operat-ing controls.

There may be occasions when the thermal storageunits must be installed outside and the equipmentsvisibility reduced. If a fenced enclosure or landscap-ing does not provide the desired screening when theICE CHILLER Thermal Storage Unit is installed on aconcrete slab, the unit can be partially buried.Caution: When this equipment is buried, attentionmust be given to excavation, drainage, concrete paddesign, placement of the unit and backfilling to pre-vent damage to the protective bitumastic coating onthe unit. The concrete slab must be designed by aqualified engineer.

When installed indoors, the access and slab require-ments described above also apply. The units shouldbe placed close to a floor drain in the event theyneed to be drained. The minimum height requirementabove the tank for proper pipe installation is 3 feet.Figure 6 illustrates the recommended overhead clear-ance for ICE CHILLER Thermal Storage Units.

For large tonhour applications, BAC will provide ICECHILLER Thermal Storage Coils for installation in

field fabricated concrete tanks. This product offeringdemonstrates BACs product design and flexibility.When coils are required, BACs manufacturing capa-bilities allow coils to be manufactured in the size andconfiguration necessary to meet specific site and per-formance requirements. The concrete tank design isto be completed by a qualified structural engineer.Figure 7 illustrates the ICE CHILLER ThermalStorage Coil layout guidelines. For large projects thatrequire ICE CHILLER Coils, contact the local BACRepresentative for selection and dimensional information.

6

Figure 5

ICE CHILLER Thermal Storage Unit

Layout Guidelines

Figure 6

Recommended Overhead Clearance

Figure 7

ICE CHILLERThermal Storage Coil

Layout Guidelines


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UNIT PIPINGPiping to the ICE CHILLER Thermal Storage Unitshould follow established piping guidelines. The coilconnections on the unit are galvanized steel and aregrooved for mechanical coupling.

For single tank applications, each pair of manifolded

coil connections should include a shut off valve so theunit can be isolated from the system. Figure 8 illus-trates the valve arrangement for a single unit. It is rec-ommended that the piping include a bypass circuit toallow operation of the system without the ICECHILLER Thermal Storage Unit in the piping loop.This bypass can be incorporated into the pipingdesign by installing a three way/modulating valve. Thisvalve can also be used to control the leaving glycoltemperature from the thermal storage unit.Temperature and pressure taps should be installed toallow for easier flow balancing and system trou-bleshooting. A relief valve, set at a maximum of

150-psi, must be installed between the shut off valvesand the coil connections to protect the coils fromexcessive pressures due to hydraulic expansion. Therelief valve should be vented to a portion of the systemwhich can accommodate expansion.

CAUTION: The system must include an expansiontank to accommodate changes in fluid volume.Adequately sized air vents must be installed at the highpoints in the piping loop to remove trapped air from thesystem.

Figure 9 illustrates reverse return piping for multiple

units installed in parallel. The use of reverse returnpiping is recommended to ensure balanced flow toeach unit. Shut off valves at each unit can be used asbalancing valves.

When large quantities of ICE CHILLER ThermalStorage Units are installed, the system should be divid-ed into groups of units. Then, balancing of each unitcan be eliminated and a common balancing valve foreach group of units installed. Shut off valves for isolat-ing individual units should be installed but not used for

balancing glycol flow to the unit.

CONTROLSTo ensure efficient operation of the ICE CHILLER

Thermal Storage Units, each system is provided withfactory installed Operating Controls. A brief descrip-tion of the controls follow.

Once the ice build cycle has been initiated, the glycolchiller should run at full capacity without cycling orunloading until the ICE CHILLER Thermal StorageUnits are fully charged. When the units are fullycharged, the chiller should be turned off and notallowed to re-start until cooling is required. The icebuild cycle is terminated by the Operating ControlAssembly. This assembly includes a low water cut-out, a shut-off switch and a safety switch. The low

water cut-out prevents the ice build mode from start-ing if there is insufficient water in the tank. The shut-off switch will terminate the build cycle when the unitsare fully charged and will prevent the next ice buildmode from starting until 15% of the ice is melted. Thesafety switch is provided to terminate the build cycleshould the operating controls fail to function correctly.

Inventory controls that provide either a 4 - 20 mA or1 - 5 Vdc are still available. These controls should beused for determining the amount of ice in inventorybut not to terminate the ice build cycle. Completeoperating control details are provided in the

Installation, Operation and Maintenance Manual.

7

Figure 9

Reverse Return Piping

Figure 8Single Unit Valve Arrangement


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GLYCOL

ICE CHILLER Thermal Storage Units typically use a25% (by weight) solution of industrially inhibited ethyl-ene glycol for both corrosion protection and freezeprotection. Industrial grade inhibited ethylene glycolis specifically designed to prevent corrosion in HVACand heat transfer equipment. Inhibitors are used toprevent the ethylene glycol from becoming acidic andto protect the metal components in the thermal stor-age system. The systems lowest operating tempera-ture should be 5F to 7F above the glycol freezepoint. The freeze point for a system with 25% ethyl-ene glycol is 14F.

Two acceptable industrial grade inhibited ethyleneglycol solutions are Dows DOWTHERM SR1 andUnion Carbides UCARTHERM. Use of other brandsof ethylene glycol in BACs ICE CHILLER ThermalStorage Products should be approved by BAC.

CAUTION: Uninhibited ethylene glycol and auto-motive antifreeze solutions are NOT to be used onthermal storage applications.

DOWTHERM and UCARTHERM are registered trade-marks of The Dow Chemical Company and UnionCarbide Corporation, U.S.A. respectively.

WATER TREATMENTIn the near freezing temperatures of the ICECHILLER Thermal Storage Unit, scale and corrosion

are naturally minimized. Therefore, water treatmentfor these two conditions may not be required or mayrequire minimal attention unless the water is corrosivein nature. To control biological growth, a biocide maybe needed to prevent the spread of iron bacteria orother organisms. For specific recommendations, con-sult a reputable local water treatment company andfollow the guidelines below:

pH 6.5 9.0

Chlorides 100 ppm maximum

Sulfate 250 ppm maximum

Total Alkalinity 500 ppm maximumTotal Dissolved Solids 1000 ppm maximum

Note: If water treatment is implemented to the system, to assure full

capacity of the ICE CHILLER Thermal Storage Unit, the water treat-

ment should not alter the freeze point of water.

Units are galvanized steel construction and a water pH of 8.3 or

higher will require periodic passivization of the galvanized steel

to prevent white rust, the accumulation of white, waxy, non-

protective zinc corrosion products on galvanized steel surfaces.

WINTERIZATION

CAUTION: Precautions must be taken to protect theunit and associated piping from freezing conditions.Heat tracing and insulation should be installed onall piping connected to the unit. The sight tube,operating controls and optional inventory sensormust be protected if the units are installed outdoorsand exposed to sub-freezing ambient conditions.

For this purpose, BAC can provide an optional heatedenclosure, complete with a 100 W heater. Otherwise,the sight tube, operating controls and optional inven-tory sensor must be heat traced and insulated. It isnot necessary to drain the unit during cold weather.Freezing of the water contained in the unit during thewinter will not damage the coil or unit.

PRESSURE DROP

The ICE CHILLER Thermal Storage Unit is designedfor low pressure drop. Figure 10 shows the pressuredrop associated with each unit for a 25% solution ofindustrially inhibited ethylene glycol. Data for flowrates not shown should not be extrapolated from theperformance curve. Pressure drops for flow rates notpresented in this table and for alternate fluids, areavailable by contacting the local BAC Representative.

8

25

0

2

4

6

8

10

12

50 75 100 125 150 175 200 225 250 275 300 325


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PRODUCTSSPECIFICATIONThe ICE CHILLER Thermal Storage Unit(s) shall beBaltimore Aircoil Model TSU-_______. Each unit shallhave a latent ton-hour storage capacity of _________ton-hours to be generated in _______ hours when sup-plied with _______ GPM of a 25% (by weight) solutionof industrially inhibited ethylene glycol. The minimumglycol temperature required during the ice build oper-ating mode shall be _______ F. Rated system perfor-mance shall be provided in the format recommendedby the Air-Conditioning & Refrigeration Institute (ARI)Guideline T. The thermal storage units shall be modu-lar in design and available in 237, 476, 594 or 761latent ton-hour increments. Unit design shall allowunits of different sizes to be installed in order to opti-mize unit selection and minimize space requirements.Tanks sizes can be mixed due to internal pipingarrangements which creates balanced flow due touniform pressure drop through the coil circuits.

The tank shall be constructed of heavy gauge galva-nized steel panels and include double break flangesfor structural strength. The tank walls shall be sup-plied with a minimum of 4-1/2" of insulation that pro-vides a total insulating value of R-18. The tank designshall utilize multiple liners. The primary liner, whichforms the interior of the unit, shall be of single piececonstruction and be suitable for low temperatureapplications. The secondary liner/vapor barrier shallbe separated from the primary liner by 1-1/2" ofextruded polystyrene insulation. The tank bottom shallbe insulated with 2" of expanded polystyrene insula-

tion and 1" of extruded polystyrene insulation.

The ICE CHILLER Thermal Storage Unit shall be pro-vided with water-tight, sectional covers constructed ofhot-dip galvanized steel. The covers shall be insulat-ed with a minimum of 2" of expanded polystyreneinsulation.

Contained within the tank shall be a steel heatexchanger that is constructed of 1.05" O.D., all primesurface serpentine steel tubing encased in a steel

framework. The coil, which is hot-dip galvanized afterfabrication, shall be tested at 190 psig air pressureunder water and rated for 150 psig operating pres-sure. The coil circuits are configured to provide maxi-mum storage capacity. The coil connections on theunit are galvanized steel and are grooved formechanical coupling.

Each ICE CHILLER

Thermal Storage Unit shall beprovided with a sight tube mounted on the end ofeach unit. The sight tube, which shall be fabricatedfrom clear plastic pipe, displays the tank water leveland corresponding ice inventory. Operating controls,consisting of two float switches are mounted on theoutside of the tank. The high level float switch termi-nates the build cycle when the tank water level reach-es the 100% ice build level. The high level switchshall also prevent re-initiation of the build cycle untilapproximately 15% of the ice has been discharged.The second float switch is a low water cutout. Thecutout requires that the water level in the ICE

CHILLER

Thermal Storage Unit be at or above the0% ice build level before the ice build cycle canbegin. A safety switch shall be provided to terminatethe build cycle should any of the operating controlsfail to act as designed. (Operating control quantitiesvary based on project requirements.) An optional dif-ferential pressure transmitter is available to supply aelectrical output signal which is proportional to theamount of ice in inventory.

The heat transfer fluid shall be an industrially inhibit-ed, 25% by weight, ethylene glycol solution specifi-cally designed for HVAC applications. The 25% (byweight) solution is designed to provide freeze/burstand corrosion protection as well as efficient heattransfer in water based, closed loop systems.Corrosion inhibitors shall be provided to keep pipesfree of corrosion without fouling. DOWTHERM SR-1and UCARTHERM are acceptable fluids.

Overall unit dimensions shall not exceed approxi-mately _______ feet by _______ feet with an overallheight not exceeding _______ feet. The operatingweight shall not exceed _______ pounds.

9


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10

ENGINEERING DATA

MODEL TSU237M TSU476M TSU594M TSU761M

Latent Capacity (TonHours) 237 476 594 761

Approx. Shipping Weight (Pounds) 9,750 16,750 20,200 24,000

Approx. Operating Weight (Pounds) 39,100 73,900 93,100 113,800

Tank Water Volume (Gallons) 2,990 5,840 7,460 9,150

Coil Glycol Volume (Gallons) 260 495 610 790

Connection Size (Inches) 2" 3" 3 3"

Unit Width 7' 103/8" 7' 103/8" 9' 91/4" 11' 93/4"

Unit Length 10' 75/8" 19' 101/4" 19' 101/4" 19' 101/4"

Notes:

1. All dimensions are in feet and inches. Weightsare in pounds.

2. Unit should be continuously supported on aflat level surface.

3. All connections are grooved for mechanical coupling.


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2001 Baltimore Aircoil Company. Printed in U.S.A. SEN-5M-4/01

P.O. Box 7322, Baltimore, Maryland 21227

410-799-6200 Fax 410-799-6416

www.BaltimoreAircoil.com

ice chiller appguide

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