{"id":1667,"date":"2024-03-08T05:09:59","date_gmt":"2024-03-08T12:09:59","guid":{"rendered":"https:\/\/www.homeworknest.com\/blog\/?p=1667"},"modified":"2024-03-08T05:09:59","modified_gmt":"2024-03-08T12:09:59","slug":"nt3036-laboratory-report-air-conditioning-processes","status":"publish","type":"post","link":"https:\/\/www.homeworknest.com\/blog\/nt3036-laboratory-report-air-conditioning-processes\/","title":{"rendered":"NT3036 LABORATORY REPORT AIR CONDITIONING PROCESSES"},"content":{"rendered":"

School of Engineering
\nUCLan Coursework Assessment Brief
\n20\/21
\nModule Title: Systems Design Module Code: NT3036<\/a>
\nLevel 6
\nLABORATORY REPORT
\nAIR CONDITIONING PROCESSES
\nThis assessment is worth 50% of the overall module mark
\nTHE BRIEF\/INSTRUCTIONS
\nObjectives
\n1. To measure the steady state air conditions across a number of air conditioning plant items and to plot the psychometric cycle.
\n2. To perform energy and moisture balances on appropriate plant items.
\nApparatus
\nA diagram of the apparatus is attached in Fig. 1 and the photo of the apparatus is attached in Fig. 2.
\n1. Air Movement
\nAir is expelled into the room through an orifice plate which is used to measure the total air flow rate.
\n2. Electric heater battery
\nHeaters are separately switched providing several levels of heat input.
\n3. Steam humidifier
\nSteam is generated by separately switched electric heaters, allowing for varied steam injection into the system. The humidifier has its own small water feed tank.
\n4. Cooler coil and refrigeration plant
\nThe direct expansion refrigeration system incorporates an automatic expansion valve which ensures a constant evaporator presser The refrigerant is circulated through the evaporator and leaves in a saturated condition ensuring that no significant changes of temperature occurs . This reduces the tendency for the air to leave the cooler with a significant temperature gradient across the duct. The saturated vapour leaving the evaporator passes into the compressor. The refrigerant leaving the compressor circulates through the condenser and then into a liquid receiver and back to the expansion valve.
\nThe nominal rate of the refrigeration can be found on the compressor plate among with Full Load amps and Locked Rota (FLA LRA) voltage etc.
\n5. Droplet elimination
\nAny moisture carried as droplets in the air is caught by the spray (droplet) elimination device, located downstream of the cooling coil. The condensation is drained from the coil and from the eliminator.
\n6. Supply fan and discharge
\nThe centrifugal supply fan handles the total flow and through the apparatus. The fan speed is adjustable in order to accommodate varied volume flow rate.
\nStatic pressure tapings are installed on the discharge duct.
\n7. Temperature measurements.
\nThermocouples are installed at the several positions along the apparatus ductwork for dry bulb and wet bulb temperature measurements.
\nMethod & Procedure
\n1. Air conditioning
\n1a. Method
\nThe fan and air conditioning plant are to be left to run in a steady state mode.
\nThe pressure differences of the orifice plate to be registered at the beginning, mid-way and at the end of the temperature measurements.
\nLog the temperature through the apparatus at 5min. intervals for a period of approximately one hour.
\nRecord the electrical energy inputs of the heater and humidifier (boiler).
\nCollect and weigh the condensate of the cooling coil over the period of the temperature measurements. (Insure that steady state conditions prevail and that all condensate is collected).
\nRecord the barometric pressure. (Pb.)
\n1b. Procedure
\n1. Make sure that the air conditioning (A\/C) unit is connected up to a computer (with a printer) via a RS232 port and check that all water reservoirs for wet bulb sensors are filled with distilled water.
\n2. Switch on the isolator and start the A\/C unit by turning on the main switch on the control panel.
\n3. Turn on the computer and boot it up in DOS mode with the formatted disc in drive A.
\n4. Type RUN <return> to start the program.
\n5. Type CHAIN \u201c574COLC\u201d in capital letters <return>.
\n6. Press N in response to the displayed question that data are to be obtained from the A\/C unit.
\n7. Press N in response to the displayed question that data are to be saved onto a floppy disc unless it is so desired.
\n8. Check that the computer and the A\/C unit are in communication by observing 4 audible beeps and flashings of the Interface Status lamp on the control panel.
\n9. Enter the refrigerant flow meter calibration factor, the atmospheric pressure in mm Hg and the heater resistances into the computer. The required data, except the atmospheric pressure, can be found on the data sheet adhered on the control panel. The atmospheric pressure can be obtained from the wall-mount barometer in the laboratory.
\n10. The set up should be ready for use after the required information is input. Select option 2 to display the psychrometric chart with the A\/C cycle plotted.
\n11. Do NOT print out any data until the system is steady and when they are needed.
\n12. Turn the fan speed control to give a moderate flow.
\n13. Start the compressor.
\n14. Turn on the water supply ball valve to supply make-up water to the boiler. THE WATER LEVEL IN THE BOILER HAS TO BE CONTINUOUSLY MONITORED TO ENSURE THAT IT IS MAINTAINED BETWEEN THE TWO RED LINES MARKED ON THE SIGHT GLASS TO AVOID OVERFLOW OR DRYING UP LEADING TO BURING OF HEATERS. If necessary, make use of the ball valve to control the water level.
\n15. Energise the 2 kW water heater and the 1 kW after-heater and allow the system to become steady.
\n16. The cycle on the display will be updated in 1-minute intervals with momentarily lighting up of the
\nsystem sampling lamp on the control panel. Only the latest two cycles will be shown with the second last one presented in dotted lines. The appearance of a single plot indicates that the system is steady.
\n17. Press R to return the display to the Master Menu after the system is steady. Select option 2 and input Y to print out the data.
\n18. Press R and selection option 2 with input of N to stop further printing after the required printout is obtained.
\n19. Obtain the rate of condensation by measuring with a beaker a required quantity of condensate from the evaporator in a certain duration.
\n20. Measure the temperatures of room air, make-up water from a tap and condensate.
\n21. The 2 kW water heaters and 1 kW after-heaters maintained turning on and 2 kW pre-heaters are then turned on.
\n22. The measurement of the temperature is carried out through the apparatus at 5 minute intervals for a period of approximately 1 hour.
\n23. The collection of the weight of the condensate of the cooling coil over the period of the temperature measurements (Insure that steady state conditions prevail and that all condensate is collected).
\n24. At the end of the test, open all switches for the heaters and compressor.
\n25. Allow the fan to run for at least 5 minutes to dissipate any residual energy.
\n26. Switch off the power supply on the control panel and turn off the isolator.
\n27. Turn off the water supply ball valve.
\n28. Return the computer display to the master menu and select option 5 to close all files and quit to DOS.
\n29. Switch off the computer and the printer.
\n2. Refrigeration
\n2a. Method & procedure
\nDuring the measurement of the air-conditioning process, the readings of the refrigeration system need to be simultaneously recorded both of pressures (Evaporator Plow and Condenser Phigh) and temperatures (Evaporator t12 & t9, Condenser t10 and TEV inlet t11).
\nReading of refrigerant flow and compressor running amps every 5 minutes will also assist in the energy balance of the apparatus.
\nPlease note that Insuring steady state has been obtained before reading commence.
\nTheoretical Background
\n1. Humidifier (Boiler)
\nHeat loss rate from Humidifer(boiler) (Qb,l) = 0.0043 x temperature difference between steam and room air, kW
\nRate of evaporation at boiler (mw,b) = (Humidifier(Boiler) heat input rate Qb,s – Qb,l)\/2501, kg\/s
\n2. Energy and mass balance between A and B
\nRate of moisture addition to air (mw,a) = ma (wB – wA), kg\/s
\nEnergy input rate (\uf044Q) = Qb,s + Qp + Wfan + Qw, kW
\nRate of energy gained by air (\uf044H) = ma (hB – hA), kW
\nwhere ma = mass flow rate of air, kg\/s
\nw = moisture content of air, kg\/kg
\nh = specific enthaply of air, kJ\/kg
\nQp = energy input rate at pre-heaters, kW
\nWfan = fan power input = 0.072 kW
\nQw = energy input rate of humidifier (make-up water) = mw,a x 4.18 x tw, kW
\ntw = temperature of make-up water, \u00baC
\nPercentage difference between moisture generation at Humidifier(boiler) and moisture absorption by air (%m) = 100 [(mw,b – mw,a)\/mw,b], %
\nPercentage difference between energy input and energy gained by air (%A-B)
\n= 100 [(\uf044Q – \uf044H)\/\uf044Q], %
\n3. Energy and mass balance between B and C
\nRate of moisture removal from air (mw,c) = ma (wB – wC), kg\/s
\nRate of heat gain from room air (QB-C) = ma (hC – hB) + mw,c hcond + Qcc, kW
\nwhere hcond = specific enthaply of condensate = 4.18 x tcond, kJ\/kg
\ntcond = temperature of condensate, \u00baC
\nQcc = rate of energy removal at evaporator = mr (h1 – h4), kW
\nmr = mass flow rate of refrigerant R134a, kg\/s
\nh1 = specific enthalpy of refrigerant leaving evaporator, kJ\/kg
\nh4 = specific enthalpy of refrigerant entering evaporator = h3, kJ\/kg
\nPercentage difference between measured rate of condensation and rate of moisture removal from air (%cond) = 100 [(mcond – mw,c)\/mcond], %
\nwhere mcond = measured rate of condensation, kg\/s
\n4. Energy balance between C and D
\nRate of energy gained by air (QC-D) = ma (hD – hC), kW
\nPercentage difference between rate of energy input at after-heaters and rate of energy gained by air (%C-D) = 100 [(Qa \u2013QC-D)\/Qa], %
\nwhere Qa = rate of input at after-heaters, kW
\n5, Air density
\nAir density = 1.2 x ((Pb.)\/1013.2) x (293\/273+t) Kg\/m3
\nResults and calculation
\n1. To calculate the air volume flow rate and the diameter orifice plate are required.
\n2. Air Conditions
\na. Plot the temperature against time and tabulate the following properties for each change of air condition as shown in Appendix A.
\n\u2022 Dry bulb temperature
\n\u2022 Wet bulb temperature (sling)
\n\u2022 Dew-point temperature
\n\u2022 Enthalpy
\n\u2022 Moisture content
\n\u2022 Specific volume.
\nb. Plot the complete “air conditioning” cycle on a psychometric chart (for both conditions).
\n(Note that to plot a cycle that \u201cworks\u201d some air conditioning may have to be modified by calculations from the energy and mass balance).
\n3. Monitor the refrigeration system and its energy exchange.
\n4. Tabulate finding as with the air conditioning results as shown in Appendix A.
\n5. Plot refrigeration cycle on a Pressure Enthalpy chart.
\nAnalysis & Conclusions
\nComment on the influence of the heat exchanger on the refrigeration cycle and suggest reasons for its use.
\nComment on the operation of the Thermal Expansion Valve (TEV) to regulate the flow of refrigerant through the evaporator.
\nEnergy and moisture balances, compare the following:-
\nHeater
\nThe air side energy output with the electrical input.
\nHumidifier
\nThe air side total energy output with the electrical input, the moisture gained by the air with the measured heater usage to produce the steam.
\nCooler coil
\nThe moisture lost by the air with the rate of condensation.
\nDiscuss the accuracy of the air conditions measurements to allow plotting the psychometric cycle and to obtain an energy and moisture balance on the heater, humidifier and cooler coil.
\nMarking scheme :
\nThis laboratory report will carry 20% of the total module percentage.
\nThis presentation will be marked:
\n\u2022 Literature Review 20%
\n\u2022 Technical content & Analysis Result 30%
\n\u2022 Conclusion 20%
\n\u2022 Referencing 10%
\n\u2022 Presentation of report (format & Graphics etc.) 20%
\nPREPARATION FOR THE ASSESSMENT
\nThe reading list can be found in the link below:-
\nhttp:\/\/readinglists.central-lancashire.ac.uk\/lists\/B0CDB3A3-5382-3BEB-99DB-D992019B1E58.html
\nRELEASE DATES AND HAND IN DEADLINE
\nAssessment Release date: 8th November, 2022
\nAssessment Deadline Date and time: (21st Feb. 2023 11:59pm (HKT) for Class A)
\n(15th Feb. 2023 11:59pm (HKT) for Class B)
\n(23rd Feb. 2023 11:59pm (HKT) for Class C)
\nPlease note that this is the final time you can submit \u2013 not the time to submit!
\nYour feedback\/feed forward and mark for this assessment will be provided on 30th March, 2023
\nSUBMISSION DETAILS
\nThe laboratory report (not more than 1250 words) will be submitted on the moodle of SHAPE complete with through Turnitin before assessment deadline.
\nHELP AND SUPPORT
\n\u2022 If you have any enquiry of the assessment, please contact Alan Lam through email: alanywlam@vtc.edu.hk. \u2022 For support with using library resources of SHAPE or UCLan, please visit: library.vtc.edu.hk or https:\/\/www.uclan.ac.uk\/facilities\/library. You will find links to lots of useful resources in the My Library tab on Blackboard and the library of SHAPE.
\n\u2022 If you have not yet made the university aware of any disability, specific learning difficulty, long-term health or mental health condition, please complete a Disclosure Form. The Inclusive Support team will then contact to discuss reasonable adjustments and support relating to any disability. For more information, visit the Inclusive Support site.
\n\u2022 To access mental health and wellbeing support, please complete our online referral form. Alternatively, you can email wellbeing@uclan.ac.uk, call 01772 893020 or visit our UCLan Wellbeing Service pages for more information.
\n\u2022 If you have any other query or require further support, you can contact SHAPE Morrison Hill Campus. Speak with us for advice on accessing all the University services as well as the Library services. Whatever your query, our expert staff will be able to help and support you. For more information , how to contact us and our opening hours visit Student Information and Support Centre.
\n\u2022 If you have any valid mitigating circumstances that mean you cannot meet an assessment submission deadline and you wish to request an extension, you will need to apply online prior to the deadline.
\nDisclaimer: The information provided in this assessment brief is correct at time of publication. In the unlikely event that any changes are deemed necessary, they will be communicated clearly via e-mail and a new version of this assessment brief will be circulated.
\nVersion: 1
\nPage 7
\nAppendix A \u2013 Results and calculation
\n1. To calculate the air volume flow rate and the diameter orifice plate are required.
\nRecord the following data:-
\nAir Flow Rate, m3\/s
\nDiameter of Orifice, mm
\n2. Air Conditions
\nPlot the temperature against time and tabulate the following properties for each change of air condition.
\nDry bulb temperature
\nEnthalpy
\nWet bulb temperature (sling)
\nMoisture content
\nDew-point temperature.
\nSpecific volume
\nPlot the complete “air conditioning” cycle on a psychometric chart (for both conditions). (Note that to plot a cycle that \u201cworks\u201d some air conditioning may have to be modified by calculations from the energy and mass balance).
\nRecord the following data:-
\n2a. The first set of data (2 kW water heaters and 1 kW after-heaters):
\nt (make-up water), \u00baC
\nt (room air), \u00baC
\ntA (dry bulb), \u00baC
\ntA (wet bulb), \u00baC
\nwA, kg\/kg
\nhA, kJ\/kg
\ntB (dry bulb), \u00baC
\ntB (wet bulb), \u00baC
\nwB, kg\/kg
\nhB, kJ\/kg
\ntC (dry bulb), \u00baC
\ntC (wet bulb), \u00baC
\nwC, kg\/kg
\nhC, kJ\/kg
\ntD (dry bulb), \u00baC
\ntD (wet bulb), \u00baC
\nwD, kg\/kg
\nhD, kJ\/kg
\nQb,s, kW
\nQp, kW
\nQa, kW
\nma, kg\/s
\ntcond (dry bulb), \u00baC
\nmcond, kg\/s
\nh1, kJ\/kg
\nh4, kJ\/kg
\nmr, kg\/s
\nQb,l, kW
\nmw,b, kg\/s
\nmw,a, kg\/s
\nPage 8
\n2a. The first set of data (2 kW water heaters and 1 kW after-heaters):
\n%m, %
\n\uf044Q, kW
\n\uf044H, kW
\n%A-B, %
\nmw,c, kg\/s
\n%cond, %
\nQB-C, kW
\n%B-C, %
\nQC-D, kW
\n%C-D, %
\n2b. The second set of data (2 kW water heaters, 2 kW pre-heaters and 1 kW after-heaters):
\nAfter 5 mins.
\nDry bulb
\nWet bulb
\nAfter 10 mins
\nDry bulb
\nWet bulb
\ntA (\u00baC )
\ntA (\u00baC )
\ntB (\u00baC )
\ntB (\u00baC )
\ntC (\u00baC )
\ntC (\u00baC )
\ntD (\u00baC )
\ntD (\u00baC )
\nAfter 15 mins.
\nDry bulb
\nWet bulb
\nAfter 20 mins
\nDry bulb
\nWet bulb
\ntA (\u00baC )
\ntA (\u00baC )
\ntB (\u00baC )
\ntB (\u00baC )
\ntC (\u00baC )
\ntC (\u00baC )
\ntD (\u00baC )
\ntD (\u00baC )
\nAfter 25 mins.
\nDry bulb
\nWet bulb
\nAfter 30 mins
\nDry bulb
\nWet bulb
\ntA (\u00baC )
\ntA (\u00baC )
\ntB (\u00baC )
\ntB (\u00baC )
\ntC (\u00baC )
\ntC (\u00baC )
\ntD (\u00baC )
\ntD (\u00baC )
\nAfter 35 mins.
\nDry bulb
\nWet bulb
\nAfter 40 mins
\nDry bulb
\nWet bulb
\ntA (\u00baC )
\ntA (\u00baC )
\ntB (\u00baC )
\ntB (\u00baC )
\ntC (\u00baC )
\ntC (\u00baC )
\ntD (\u00baC )
\ntD (\u00baC )
\nPage 9
\n2b. The second set of data (2 kW water heaters, 2 kW pre-heaters and 1 kW after-heaters):
\nAfter 45 mins.
\nDry bulb
\nWet bulb
\nAfter 50 mins
\nDry bulb
\nWet bulb
\ntA (\u00baC )
\ntA (\u00baC )
\ntB (\u00baC )
\ntB (\u00baC )
\ntC (\u00baC )
\ntC (\u00baC )
\ntD (\u00baC )
\ntD (\u00baC )
\nAfter 55 mins.
\nDry bulb
\nWet bulb
\nAfter 60 mins
\nDry bulb
\nWet bulb
\ntA (\u00baC )
\ntA (\u00baC )
\ntB (\u00baC )
\ntB (\u00baC )
\ntC (\u00baC )
\ntC (\u00baC )
\ntD (\u00baC )
\ntD (\u00baC )
\n6. Refrigeration
\nRecord the following data:-
\nAfter 5 mins.
\nAfter 10 mins
\nRefrigerant Flow kg\/s
\nRefrigerant Flow kg\/s
\nAfter 15 mins.
\nAfter 20 mins
\nRefrigerant Flow kg\/s
\nRefrigerant Flow kg\/s
\nAfter 25 mins.
\nAfter 30 mins
\nRefrigerant Flow kg\/s
\nRefrigerant Flow kg\/s
\nAfter 35 mins.
\nAfter 40 mins
\nRefrigerant Flow kg\/s
\nRefrigerant Flow kg\/s
\nAfter 45 mins.
\nAfter 50 mins
\nRefrigerant Flow kg\/s
\nRefrigerant Flow kg\/s
\nAfter 55 mins.
\nAfter 60 mins
\nRefrigerant Flow kg\/s
\nRefrigerant Flow kg\/s
\nPage 10
\n7. Refrigeration (Cont\u2019d)
\nEvaporator Pressure
\nPlow (kPa)
\nCondenser Pressure
\nPhigh (kPa)
\nEvaporator Temperature, t4
\nEvaporator Temperature, t1
\nCondenser, t2
\nTEV Inlet, t3
\nPage 11
\nAppendix B \u2013 Schematic , Laboratory Equipment and Relevant Charts
\nFig. 1 Schematic Diagram of the Air-Conditioning Process
\nPage 12
\nFig. 2 Photo of the Air-conditioning unit
\nPage 13
\nPage 14<\/p>\n","protected":false},"excerpt":{"rendered":"

School of Engineering UCLan Coursework Assessment Brief 20\/21 Module Title: Systems Design Module Code: NT3036 Level 6 LABORATORY REPORT AIR CONDITIONING PROCESSES This assessment is worth 50% of the overall module mark THE BRIEF\/INSTRUCTIONS Objectives 1. 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