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Engineering Education Scheme Presentation

To be made in front of judges

Matthew Akerman

on 22 October 2010

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Transcript of Engineering Education Scheme Presentation

Mainly rental services which come at a hefty premium for a limited amount of time. Such solutions are few and far between
whilst also being expensive. Low profile, simple and minimal design to try to achieve as low a surface area as possible. Various heating methods. INTRODUCTION The team is comprised of Matt Akerman, Laura Barton, Eleanor Burrill and Rebecca Urie, students at Clitheroe Royal Grammar School. Working with Ultraframe, a market leader in
Conservatory Roofing Systems, to design and
build a Hotbox to measure thermal efficiency The Hotbox must be 3000mm x 3000mm and measure the power taken to maintain a constant twenty degree celsius temperature difference between the external and ambient temperature of the room. Changes to building regulations are the reason for the project being set. Due to circumstances out of the control of CRGS and the team, the project was commenced late and as such the team also were unable to attend the Launch Day. RESEARCH Existing Hotboxes Insulating Materials Temperature Woods and metals would
be poor insulators and would not have the necessary strengh under compression. The team decided that foams would be best to use. On a trip to a local building centre, XtraTherm was recommended. To understand the project fully it is important to understand the temperature physics surrounding it Zeroth Law states that the energy lost across a material is proportional to the temperature difference between the two sides of the material.

ie Q = d x C (where C is a constant value for a material, d is the temperature difference and Q is the energy lost) Where heat is produced, convection currents usually occur. Convection currents are caused by the fact that hot air is less dense than cold air. Cold air has less kinetic energy and more particles in any given area, thus is more dense and sinks.

Warm air rises and cold air falls. For the team's project, this means that temperature could vary across the conservatory. Measuring Temperature And Power ENGINEERING EDUCATION SCHEME 2009/10
Thermal Insulation Test BY Matthew Akerman, Laura Barton, Elle Burrill and Rebecca Urie of CRGS in association with Ultraframe To measure the temperature, it is important to take into account thermal physics. As such, the team needed a device which could take an average of the temperature of a large area of space. The simplest option would be to use a digital thermometer to take a temperature inside the conservatory and one to take a temperature outside the conservatory. This is highly ineffective, however. A thermostat could be used to measure the temperature inside the conservatory and automate a heated output to maintain one particular temperature. This wouldn't take an average and would assume a constant external temperature. They can also take a lot of time to react to situations. Thermocouples are accurate devices which can be used as 'probes' to measure temperature. These can read individual temperatures, like a multimeter, or can be used as part of a datalogger. The team researched a datalogger by a company called Pico and decided to use it. It can take upto 8 inputs through a thermocouple, feed values into a computer and produce averages and graphical outputs of the values obtained. This is useful and would be used with a manually controlled heating system. To measure the power taken by a heater, the team researched several options. The first option was suggested by Laura; it was an E-on device which wirelessly measured the current, voltage and power taken by a mains device. However, upon testing this device the team found it was not what they required and didn't feel it worked well. The team considered using a multimeter, possibly with an output to a computer, to measure the power. However, this would be highly ineffective and it could prove difficult to connect everything up. Finally, upon further research, the team discovered a plug based device which would easily suffice - it would measure the average power, the cumulative power taken and had low tolerances when measuring current and voltage. Heating The team found that there are many different types of heater. Each has unique properties and as such is suited to a different task. The team estimated that a 400W heater would be appropriate for the final model, although it could be more powerful than needed. Convectional heaters work by creating a convectional current and as such spread heat around the room. They are quite appropriate for the project. Radiation heaters work by using infrared waves. Instead of heating by giving kinetic energy to air particles like convectional heaters, they work by sending a wave of heat. Radiant heaters have many practical applications but the team felt they wouldn't be suitable for this one. Fan heaters work by heating air and then circulating this around. The heat flow is not very constant and the temperature really would fluctuate around the whole conservatory. Oil filled heaters are another type of heater but it is much more difficult to measure the power consumed - especially bearing in mind that the team had agreed on a plug socket based device Convection heaters were seen to be the best choice. A small profile one would be needed and the team found that underfloor mat heaters, commonly used in conservatories, would be most suitable. THREE DAY WORKSHOP Using the datalogger, the team began to test the hotbox. Rebecca and Matt stayed to conduct some tests while Laura and Elle began to make headway on the report. A presentation was given to the other teams about the work undertaken during the workshop at Lancaster University. This short 5 minute presentation gave a good grounding for CAD and helped the team to use the advice given to them about how to make a presentation. All teams were welcomed to Lancaster University and given an introductory session explaining the purpose of the workshop and reminding them about certain aims of the EES scheme. Second Day The team continued to experiment with different methods throughout the morning before finally concluding that it would be best to switch the heater on and off 30 seconds after the differential was achieved/lost. Whilst other teams then proceeded to begin or indeed continue their projects, the CRGS team were given brief versions of the Launch Day presentations. Third Day While the team waited for glue to set they set about asking the engineers about methods of heating the conservatory and methods of measuring the temperature in the absence of a thermometor and having been unable to obtain a heater. The team set about manufacturing the hotbox. FIRST DAY WELCOME
PRESENTATIONS The team used the second day to finish off the model. They constructed a steel frame for the base and cut a hole in the hotbox to allow a tube to pass through which a hot air gun would heat. This design was for the purpose of testing only. Some of the report was also completed according the the recommendations and guidelines given by Mr Bayliss at the presentation on Monday. The datalogger worked by taking an average of the temperature inside from 4 different places and an average outside from 2 places. A graph of the results was produced making it easy to see the temperature difference. First Day - Manufacture Different methods were used to try to find the best method to conduct the experiment. Tests were not always conducted over a full hour due to time constraints but methods were varied. Analysis of the results comes later. The team were told they could use a hot air gun to heat the hot box. The team were given thermocouples and multimeters capable of reading temperature to experiment with and test. That evening, their engineer delivered a datalogger to the hotel. Project Management The team divided responsibilities according to each individual's skills. Responsibilities Matt was assigned the task of compiling the report and managing its progress and a lot of physics related research. Laura, Eleanor and Rebecca were assigned various sections of the report to complete as appropriate and according to their strengths and weaknesses, whilst also being tasked with various sections of research. All artistic jobs were completed by them and the majority of construction was completed by them too. The Gantt Chart allowed the team to track progress of tasks to ensure that all tasks would be completed on time by using a progress bar and dates at the top. The Gantt Chart helped to remind the team of various remaining tasks which could otherwise have been forgotten about and was a useful tool throughout the project. Gantt Chart Eleanor and Laura finalised the design of the Gantt chart at the 3 day workshop according to the advice given by Mr Bayliss and proceeded to update it regularly. Minutes helped the team to track who was present at meetings and who was absent, thus also allowing the team to track which people knew what information. Detailed minutes of meetings were kept to ensure that the team knew what the objectives and tasks to be achieved by the next meeting were and who would complete these tasks. Minutes of Meetings Minutes also allowed the team to keep track of what had been completed and to document what happened in each meeting. Minutes helped the team to remember everything that happened as it is easy to forget after a week long gap between meetings. As such, the report was kept online for most of the project using Google Documents. This allowed all the team members to have instantaneous access to the latest version of the report remotely and allowed multiple users to edit at once by sharing the file with members' individual google accounts. An email account was set up by the team to allow easy communication.By choosing a Googlemail account, the team were also able to share files online. Emails could be send and received from the account easily and communications allowed messages to be transmitted quickly. Minutes could be sent easily and questions could be answered quickly. Communication Overview The plug device will measure the cumulative power taken (KWh). The heater will be turned off after one minute when the differential is achieved and turned on 30 seconds after the differential drops to 18 degrees. Based closely on the original testing rig.

3000mm x 3000mm box made from XtraTherm foam. Final Product The tests will be conducted outside and the test will begin when the hotbox is the same temperature as the external temperature. Pico Datalogger used to record temperature Method Heater controlled manually. The test will be conducted for an hour each time and while graphs will help to compare outputs, the main comparison between roofing systems will be the power taken to maintain the temperature difference. The opportunity allowed the team to see engineering in a different light - very different to the stereotypical mechanical engineer which is vastly different to what the team experienced. By solving a real life problem in Engineering, the team realised how big the role of Engineers in society is - almost everything around us is the result of a problem solved by an Engineer of some description and/or speciality. Eye Opening Skills These skills will all be relevant in the future and were well practiced through the duration of the scheme. Involvement with EES The importance of meeting deadlines really hit home through completing the project. Members of the team are considering Engineering as a degree to be taken at University and as a future career, or certainly courses and careers in closely related disciplines. Through the EES, the team all developed important skills in communication, project management, independent learning and writing a report. The team used a themral imaging camera to see where heat was being lost from the conservatory. Whilst interesting, Ultraframe did not wish for the team to pursue this concept any further.
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