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Redesign of Bennett Hall HVAC System Greg Andreasen Michael Chicoine Florent Hoxha Jason JacobeAdvisor Michael Mick Peterson Ph D and Justin Poland Ph D Background.Solution 2 was picked as the better solution because the first solution reliesHeat Ventilation and Air Conditioning HVAC systems are systems that treat more on a constant strong heat load being placed on the building Thus and circulate the air of a building to make it comfortable for people to work in when there are small heat loads and room is settled at lower temperatureThe HVAC system consists of a series of fans pumps and coils that heat or such as 72F this will result in a cooler mix air temperature and possible coldcool the air as needed and transport the air to desired destinations throughout working environment This would work but wouldn t give a consistent room.the building An HVAC system also regulates the humidity of the air in the temperature For the second solution the air is at 70F when it comes to thebuilding by cooling the air to very low temperatures and heating it back up room air unit so the mixed air will always be at comfort zone between 70FThe figure below is a schematic of the HVAC system in Bennett hall The High Voltage Equipment Hydrogen Dewer Rusty Shop Equipment and 75F and will satisfy the acceptable humidity levels Central Air Handler takes the air in from outside and it either cools it by Figure 2running it through cooling coils or it heats it passing through heating coils. depending on the season The air is then brought to the individual room unitcoolers which mix re circulated room air with the ventilation air and provide Objective Economicsadditional cooling in summer as needed This way each room in the building Our objectives are as follows Since the only changes to the system will be made for its operation duringbecomes a comfortable working area the summer months the cost analysis was run only for May through. Redesign system for 50 relative humidity September The graph below shows how much money each unit uses for Use as many existing system components as possible operating The system will run with only minor variations to flow rates The Maintain comfortable temperature conditions price for a new coils is the only additional charge At present the cost to runthis system is about 3000 and this will not change with the new coil TheDesign price of the new coil is yet to be determined .Main air handlerThe first approach in finding the solution to the problem was to find the overall Individual fan heatheat load that the building is under The heat load was found by applying heat 600 00Chiller Power costtransfer analysis to the wall windows and ceiling of the building using summer Pum p Power cost.temperatures Once the heat loads on the building and the rooms were 500 00 Total Summ erMonthly costcalculated these were used in generating two possible solutions Solution 1 300 00The first solution was to put a new cooling coil in the main air handling unit.which would cool the air to the temperatures of 63F db and 62F wb This airwould then be sent to the individual room air units where it would be mixed 100 00with the room air and cooled again for comfort This would then be blown intoFigure 1 the room resulting in room temperatures of 75F 3F db and 62F wb Figure3 shows the schematic of this solution.Main Air Handling UnitWhen the Bennett Hall HVAC system was installed the system was designed 87F db 63F db Room Unit Cooler Figure 5to control only the temperature of the building The humidity level was not 71F wb 62F wbMixed Air at Future Workfactored into the system s design The humidity however is high enough Room.75 db and 62 wbsometimes to cause concern for the scientists Experiments conducted in the AirOur design results and the feasibility of our choices will be documented andbasement cause very low equipment temperature This in turn causes the air Figure 3saved The redesign has already been done and our solution will be.Cooling Coilclosely surrounding the equipment to drop below its dew point Condensation Solution 2 compared to facilities solution and sometimes frost will form on equipment This is not acceptable for the The second solution considered was to put a larger cooling coil in the main airprofessors working in the area In one case this condensation forms on a handling unit which would cool the air to 57F db and 56F wb Then there Acknowledgementpiece of equipment that creates a very high voltage and makes testing unsafe would be a reheat coil which would heat the air up to 70F db while maintaining.Frost has also been forming on a hydrogen Dewer another apparatus used in the wb at 56F The air would be sent to the individual room air units and would We would like to acknowledge those who helped us throughout the designthe basement This freezing makes performing slight adjustments to the mix with the room air and come out of the units mixing with room air providing process These include Professors Justin Poland and Michael Peterson Weequipment difficult and the professor claims it effectively creates a hydrogen 75F 3F db and 56Fwb Figure 4 shows the schematic of this solution would also like to acknowledge Facilities Management Stewart Harvey andbomb in the Bennett Basement In addition to experimental equipment beingTrane salesman Nick Veccchione .sacrificed by the unacceptable relative humidity the shop equipment has been Main Air Handling Unitsuffering as well The poor humidity level has been allowing rust to form on 87F db 70F db Room Unit Coolershop equipment sacrificing its quality and shortening its useful life 71F wb 56F wbMixed Air at75 db and 56 wb.Heating Coil Figure 4Cooling ColiHeat Ventilation and Air Conditioning (HVAC) systems are systems that treat and circulate the air of a building to make it comfortable for people to work in. The HVAC system consists of a series of fans, pumps, and coils that heat or cool the air as needed and transport the air to desired destinations throughout the building.