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The architectural and HVAC plans for the Uytengsu Building on campus are provided. The details of...

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Electrical Engineering

The architectural and HVAC plans for the Uytengsu Building oncampus are provided. The details of the equipment installed areprovided. From this information determine the estimated overallbuilding heating and cooling requirements and compare to the \"ruleof thumb\" information given in the first chapter. Briefly, write upyour findings in a technical memorandum showing your calculationsstating any assumptions. Upload your findings in a pdf.

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3.8 Ratings (530 Votes)
INTRODUCTIONThe most important aspect of anefficient heating system is getting the size right It was oncecommon practice to oversize boiler plant to overensure thatheating demand was met In addition improvements in buildingfabric and an increase in internal heat gains such as from ITequipment and change of useoccupancy means that where a boilerhas not been replaced for many years the heating load of thebuilding may have changed significantly It is therefore importantto identify and understand core business requirements and use thisto inform any proposed improvements to an HVAC system Typicalquestions you should consider are What is the current internaltemperature of the building Are employees happy with theinternal environment Are there any hot or cold spotswithin the building Are there any areas of thebuilding where temperature is critical When is the building occupiedCALCULATING HEATLOADDEMANDThere are five factors thatdetermine the energy load of a heating system The design layout and operationof the building this affects how the external environment impactson internal temperatures and humidity The required indoor temperaturesand air quality The heat generated internally bylighting equipment and people all of these have an impact on howwarm your building is The type design and efficiency ofthe heating plant Building usage patterns Usingrules of thumb or the Simple Sizing Calculation is oftensufficient to determine approximate plant requirements and sizes atthe concept stageRULES OF THUMBRules of Thumb are generalprinciples derived from practice and experience rather than precisetheory They can be useful for approximately calculating valuessetting outline targets and rapidly comparing differentoptionsGROSS INTERNAL AREAGIAThe floor area contained within thebuilding measured to the internal face of the external walls Noboiler is 100 efficient Heat is lost via the flue gases andthrough the main body of the boiler itself Therefore this valueneeds to be adjusted to correctly size heating plant according tothe plant efficiencyBoiler seasonal efficiencyvalues should be used rather than manufacturers quotedinstantaneous efficiencies as this takes into account the actualoperation of the boiler or its practical use measured at full andpart load It is a weighted average of a defined number of hours offull and part load operation which represents a full year ofoperation Note that the boiler efficiency is also affected by theheating system typeSIMPLE SIZING CALCULATIONThis calculation method works bydetermining the primary heat losses in your building and thenworking out the level of heating that would be required to achievethe buildings desired temperature Begin by determining the TotalHeat Loss QTQT QF QV WattsQF is fabric heatlosses QV is ventilation Infiltration heatlossesWatts W are unitsof power the rate at which energy is generated or used and areoften quoted in kilowatts 1000W 1kWQF U A T WU is the uvaluefor each surface material Wm2CA is the surfacearea of each building component m2T is thedifference between desired internal temperature and externaltemperature CQV N V T WN number of airchanges per hourV volume ofbuilding in m3There are    See Answer
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