WIXLIB

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSCoilComfort IONSThe coil, or evaporator coil, is connected to the airflowoutlet of the furnace. Conditioned refrigerant iscirculated through the coil to cool the structure in thesummer and heat in the winter. As warm indoor airpasses through the indoor or evaporator coil,temperature and humidity are removed creating coolerindoor air. Installing a correctly sized and ratedevaporator coil is essential for getting the highestperformance and comfort from your central airconditioning or heat pump system.Common air conditioning systems designed for thecomfort of people. When compared to computer roomair conditioning systems, comfort systems typicallyremove an unacceptable amount of moisture from thespace and generally do not have the capability tomaintain the temperature and humidity parametersspecified for IT rooms and data centers.According to 29 CFR 1910, Competent is defined aspossessing the skills, knowledge, experience, andjudgement to perform assigned tasks or activitiessatisfactorily as determined by the employer. 1910.120A Compressor is a unit used for compressing vapor tohigher pressures. It is the heart or “pump” within an airconditioning, refrigeration or heat pump systemA condenser is a unit (usually a heat exchanger) in whichheat is transferred from vapor to the outside air in orderto condense ammonia into a liquid.Page 9 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSCondensateCondenser CoilCondenser fanConductance,Thermal (C-value)ConductionConductivity,Thermal (K-value)ConvectionDEFINITIONSAs warm air is pulled or pushed across the coolevaporator coil the coil perspires, creating liquid, orcondensate which is mechanically drained away fromthe equipment.Generally, it is the outdoor coil It removes heat from therefrigerant in the summer months, allowing therefrigerant to be converted from vapor to liquid andcomplete the refrigeration process.It is a fan that accelerates the movement of air over thecondenser coil, facilitating the removal of heat from therefrigerant.It is the time rate of steady-state heat flow through aunit of a material or construction induced by a unittemperature difference between the body surfacesIt is a mode of heat transfer in which heat energy istransferred within an object itself or between objects incontact. When a cold spoon is left in a pot of boilingwater, the spoon eventually becomes hot. This is anexample of conduction. Conduction is one of the threeforms of heat transfer, which also include Convectionand RadiationIt is the measure of heat that passes through a unit areaof a homogenous substance, through a unit thickness, ina unit of time, for each unit temperature difference. Thelower the K-value, the higher the insulating valueIt is a mode of heat transfer in which heat energy istransferred from an object to moving fluid such as air,Page 10 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSCooling TowerCPCVCPL 02-00-148CPL 02-02-07Appendix ACPL 03-00-014CPL 2-2.45ACPRCQCRCRACDEFINITIONSwater, or refrigerant. The heat sink of a computerprocessor is an example of heat transfer by convectionIt is a heat rejection method that transfers heat energyfrom a data center or IT room to the outside atmospherevia the evaporation of water. In a cooling tower, water issprayed onto a high surface-area packing material aslarge volumes of air are drawn across through thestructure. The net effect of this process is that a smallportion of the water circulated through the coolingtower evaporates into the outside atmosphere. Theremaining water (now cooler) is collected at the bottomof the cooling towerSpecific Heat at Constant Pressure. Its English unit isBTU/lb.- FSpecific Heat at Constant Volume. Its English unit isBTU/lb.- FOSHA’s Field Operations ManualOSHA’s discussion on the difference between “incidentalrelease and emergency response”OSHA’s New CHEMNEP NationwideOSHA’s instruction of auditing PSM programs “PQV”. Itbegan on September 13th, 1994.Vessel identifier for Controlled Pressure ReceiverShorthand for Contractor’s QualificationsCompression RatioComputer Room Air Conditioning Unit. It is a deviceusually installed in the data center that uses a self-Page 11 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC CDEFINITIONScontained refrigeration cycle to remove heat from theroom and send it away from the data center through akind of cooling medium via piping. It must be used with aheat rejection system which then transfers the heatfrom the data center into the environment. The heatrejection system typically takes one of the followingforms: condensing unit, fluid cooler, or cooling tower todischarge heat to the outdoor atmosphereComputer Room air Handling Unit. It is a device usuallyinstalled in the data center or IT room that usescirculating chilled water to remove heat. It must be usedin conjunction with a chillerCanada Standards AssociationDepartment of Homeland Security’s Chemical SecurityAssessment ToolUnited States Chemical Safety BoardCompliance Safety and Health Officer (See also CHSO)Car Sealed Closed. A valve sealed in the closed positionCar Sealed Open. A valve sealed in the open positionDepartment of Homeland Security’s “Chemical-terrorismVulnerability Information”A Damper is a valve for controlling airflow. It is found atthe junction point of ductwork; movable plate opens andcloses to control airflow. It can be manually orautomatically controlled to regulate airflow to desiredsystem zonesPiping Identification for Defrost Condensate LinePage 12 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ionDEPDesign ConditionDew PointDHSDiffuserDOEDOTDEFINITIONSIt is a type of electrical current that only flows in onedirection.It is evaluated by subtracting the average outdoortemperature for an area from 65 F. This measurement isused to estimate the amount of heating or cooling ahome or building will need.It is a device that removes humidity, or moisture, fromthe airAccording to 29 CFR 1910, Demonstration is defined asthe showing by actual use of equipment or procedure.1910.120Directorate of Enforcement Programs or Department ofEnvironmental ProtectionIt consists of the desired properties for an environmentexpressed in dry bulb temperature, wet bulbtemperature and relative humidity. Cooling equipmentmanufacturers normally published performance data ofair conditioning systems at several design conditionsIt is the temperature at which water vapor begins tocondense. On a hot summer day, a cold soda can isbelow the dew point which causes condensation on thesurface of the can.US Department of Homeland SecurityIt is a grille over an air supply duct with vanes thatdistribute the discharging air in a specific pattern ordirectionDepartment of Energy. Website: www.energy.govUS Department of TransportationPage 13 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSDownflow FurnaceDQCDrain PanDry EEDEFINITIONSIt is a furnace with an intake on the top and an airdischarge at the bottomDocument Quality ControlIt is also referred to as a condensate pan. As vaporcondenses, the drain pan collects the condensate andchannels it to the drain lineIt is the temperature measured without considering thehumidity.Ductwork consists of round or rectangular pipes orcontrolled paths acting as a conduit for return, mixed,makeup, supply or exhaust air. Supply air is downstreamof high pressure side of fan while the Return air isupstream of low pressure inlet of fanDirect Expansion Evaporator. It is a general term appliedto air conditioning systems that have a self-containedrefrigeration system and are air, glycol or water-cooled.Emergency Action Plan 29 CFR 1910.38Employee Alarm SystemThe term is used to describe a mechanism that removesflash gas from the evaporatorAccording to 29 CFR 1910, Education is defined as theprocess of imparting knowledge or skill throughsystematic instruction. It does not require formalclassroom instruction. 1910.155OSHA shorthand for Employee (It is common in citations)Page 14 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSEEREHHCEnergy Star EnthalpyEOPEPEPAEPCRAEQDEFINITIONSEnergy Efficiency Ratio. It is the ratio of the outputcooling energy (in BTU) to input electrical energy at agiven operating point.Extremely Highly Hazardous ChemicalENERGY STAR is a U.S. Environmental Protection Agency(EPA) voluntary program that helps businesses andindividuals save money and protect our climate throughsuperior energy efficiency. Website:www.energystar.govIt is the total quantity of energy used to heat or cool asubstance between two temperatures including theenergy used to change the state of the substance ifapplicable. For example, if we heat a sample of water atnormal atmospheric pressure from 33 F to 275 F (1 C to135 C), the enthalpy is the sum of the sensible heatenergy added (from 33 F / 1 C to 212 F / 100 C and from212 F / 100 C to 275 F / 135 C) and the latent heatenergy added (state change from liquid to vapor at212 F / 100 C)Emergency Operational ProcedureEmployee ParticipationEnvironmental Protection Agency. It is an agency of theU.S. federal government which was created for thepurpose of protecting human health and theenvironment by writing and enforcing regulations basedon laws passed by Congress. Website: www.epa.govEmergency Planning and Community Right-to-Know ActPiping Identification for Equalizer LinePage 15 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSERESESPEvaporatorEvaporator coilEXExpansion ValveF-RatingFacingFahrenheit ScaleFanDEFINITIONSEmergency Response, also OSHA shorthand forEmployer (It is common in citations)Piping Identification for Economizer Suction LineEmergency Shutdown ProcedureAn Evaporator is a unit designed to vaporize liquidrefrigerant, thus cooling the air by absorbing heatIt is also known as an indoor coil. It is a device designedto absorb heat in the air in order to change the liquidrefrigerant that flows through it into a vapor initiatingthe cooling process.Exhaust AirIt is a valve that meters the levels of refrigerant througha temperature or pressure controlIt is a rating usually expressed in hours, indicating aspecific length of time that a fire-resistive barrier canwithstand fire before being consumed or permitting thepassage of flame through an opening in the assembly, asdetermined by ASTM E 814 (UL 1479)It is a thin covering adhered to the surface of insulationprior to field installationIt is a scale for temperature with its units in “ F”. On aFahrenheit thermometer, under standard atmosphericpressure, boiling point of NH3 is -28 F while the freezingpoint is -107.9 F. Whereas, that of water is 212 F and32 F respectively.It is a device consisting of motor and a blower wheelthat creates airflow.Page 16 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSFARFibrous InsulationFilm (Wet)FilterFinishFlashFlow RegulatorFluid RegulatingValveFMEADEFINITIONSFatal Accident RateIt is the insulation composed of small-diameter fibersthat finely divide the air space. Fibers used are silica,rock wool, slag wool, or alumina silicaIt is the applied layer of mastic or coating before curingor dryingA central heating and cooling system may use multiplefilters. The air filter is integral to the system intakeducting, prevents contaminants from entering theequipment and must be maintained or replaced atregular intervals. There is also a filter in the refrigerationsystem, also referred to as a drier, which acts like astrainer to remove dirt and undesired particles from thesystem.It is the texture of a metal surface. Finishes includejackets, mastics, or strong films used for aesthetics or toprotect insulation from 1 or more of the following:weather, mechanical and/or personnel abuseIt is a term used to describe the change in state ofrefrigerant from a liquid to a vapor inside the expansionvalve and evaporator coil of a room air conditioning unitA Flow Regulator is a controlling device which regulatesthe flow of liquid in a pipeIt is a device, often controlled by an electric motor, toregulate the flow of water or glycol through the coiland/or heat exchanger in a computer room airconditioner or air handFailure Mode Effects AnalysisPage 17 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSFlueFOMFRFreonFSFully DuctedDistributionFurnaceFuseGAMAGaugeGauge ManifoldGCAPGranular InsulationDEFINITIONSIt is a vent that removes the byproducts of combustionfrom furnaceOSHA’s Field Operations ManualPiping Identification for Flooded Return LineIt is a generic term applied to several types ofrefrigerants commonly found in an air conditioningsystemPiping Identification for Flooded Supply LineIt is an air distribution or return methodology in whichair is directly ducted into or out of the loadsIt is a device that facilitates the combustion of fuel andair to create heat and then circulates it through thehome by means of a fan. It is the major gas firedcomponent for heating a home.It is a delicate metal strip connecting two parts of anelectrical circuit. This strip works as a safety, or circuitprotector, and breaks, or melts, in the event of excesselectrical charge, breaking the electrical circuit.Gas Appliance Manufacturers AssociationIt is a device used to measure pressures belowatmospheric pressureIt is a device constructed to hold compound and highpressure gauges containing hand valves to control flowGarden City Ammonia ProgramIt is the insulation composed of small nodules thatcontain voids or hollow spaces. The materials may becalcium silicate, diatomaceous earth, expandedPage 18 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ERHead PressureHead PressureControlHead, StaticHead, VelocityHeat ExchangerHeat GainHeating CoilHeat LossDEFINITIONSvermiculite, perlite, cellulose, or microporousinsulations.According to 29 CFR 1910, Hands-on-Training is definedas the training in simulated work environment thatpermits each student to have experience performingtasks, making decisions, or using equipment appropriateto the job assignment for which the training is beingconducted. 1910.120Hazard Communication 29 CFR 1910.1200Hazard and Operability StudyHazardous Waste Operations and Emergency Response29 CFR 1910.120It is the pressure which exists in the condensing side of arefrigerating systemIt is the pressure operated control which opens electricalcircuit if high side pressure becomes excessiveIt is the pressure of fluid expressed in terms of height ofcolumn of the fluid, such as water or mercuryIn flowing fluid, height of fluid is equivalent to itsvelocity pressure.It is a device for the transfer of heat energy from thesource to the conveying medium.It is the amount of heat added or created in a designatedareaIt is a coil that acts as a heat source for a heating systemIt is the amount of heat subtracted or lost from adesignated areaPage 19 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSHeat PumpHeat MHTLHTRLHTSDEFINITIONSIt is a device used for either the heating or cooling of aspace by transferring heat between two reservoirsIt is the flow of heat from one area to another byconduction, convection, and/or radiation. Heat flowsnaturally from a warmer to a cooler material or space.Hand Expansion Valve (also referred to as HXV)Piping Identification for Hot Gas LinePiping Identification for Hot Gas Defrost Line (alsoreferred to as Hot Gas Discharge)Highly Hazardous ChemicalAccording to 29 CFR 1910, Housekeeping is defined asthe process of keeping the storage areas free fromaccumulation of materials that constitute hazards fromtripping, fire, explosion, or pest harborage. Vegetationcontrol will be exercised when necessary. 1910.176Piping Identification for High Pressure Liquid LineHigh Pressure ReceiverPiping Identification for High Stage Discharge LineHeating Seasonal Performance Factor. It is a termspecifically used to define the measurement of efficiencyof residential heat pump systemPiping Identification for High Stage Suction LineHigh Toxic Hazardous MaterialPiping Identification for High Temperature Liquid LinePiping Identification for High Temperature RecirculatedSuction LinePiping Identification for High Temperature Suction LinePage 20 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC IARIIAR Bulletin 107IIAR Bulletin 108DEFINITIONSHand Shutoff Valve or Hand ValveHeating, Ventilation and Air Conditioning. Sometimes an“R” is shown at the end to represent Refrigeration.It is a device that adds humidity, or moisture, to the airIt is a device that measures humidity and turns thehumidifier on and offIt is the dampness in the air caused by water vaporHot Work PermitHand Expansion Valve (also referred to as HEV)Industrial Ammonia Refrigeration Operators NationalStandardInternational Association of Refrigerated WarehousesImmediately Dangerous to Life and Health. It was setforth by OSHA at 300 ppm for AmmoniaInternational Existing Building CodeInternational Energy Conservation CodeInstitute for Electrical and Electronic EngineersInternational Fire CodeInternational Fuel Gas CodeIt is the process of increasing the temperature of asubstance to the point of causing a combustive reaction.Individual Hazard IndexIncident InvestigationInternational Institute for Ammonia RefrigerationSuggested Safety and Operating Procedures whenmaking Ammonia Refrigeration Tie-insWater Contamination in Ammonia Refrigeration SystemsPage 21 of 42Refrigeration Terminologies and Acronyms, Rev. 0 .0Jan 2020

ENGINEERING BULLETIN NO. 1DTC ENGINEERINGTERMSIIAR Bulletin 109IIAR Bulletin 110IIAR Bulletin 111IIAR Bulletin 112IIAR Bulletin 114IIAR Bulletin 116IIRIMCInduction DEFINITIONSIIAR Minimum Safety Criteria for Ammonia RefrigerationSystemsIIAR Guidelines for: Startup, Inspection, andMaintenance of Ammonia Mechanical and RefrigerationSystemsGuidelines for: Ammonia Machinery Room VentilationAmmonia Machinery Room DesignGuidelines for: Identi

Refrigeration Terminologies and Acronyms, Rev. 0.0 Jan 2020 . ENGINEERING BULLETIN NO. 1 DTC ENGINEERING. TERMS DEFINITIONS . glass such as polystyrene, polyurethane, polyisocyanurate, or elastomeric. Celsius . It is a temperature scale that registers the freezing point of water as 0 and the boiling point as 100 under