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Component B1b – Semester 1 Coursework –Part 2 CW 1b – Heat Balance (25 marks) For this coursework you are given a space in either Q or R block the number of which is dependent on the last digit of your UWE ID number: NB: These rooms are all teaching spaces and you must not enter while they are being used as such. If they are being used by other students you must ask politely if you can study the room alongside these students and respect their decision. Part-time students are advised to examine their rooms as early as possible to avoid last minute rushes to complete the work. You must write a short report on this space addressing the issues listed below. You should provide a sketch of the space and illustrate your report with low resolution photographs. Drawings and construction details for Q and R block can be found on the S-drive accessible from non-Mac PCs on campus (T:\fet\CP\Case Study Buildings). Heat Balance Calculation – Undertake a heat balance evaluation of your space using the following information. This calculation should be provided neatly, clearly laid out in the order dictated in the brief, with all your workings and with no commentary (other than reference to the sources from which you took relevant data). • You will need to estimate the dimensions of the space, its volume and the areas of the different surfaces which will have a significant temperature difference across them over the course of the heating season. (typically external walls and windows) • Calculate the U-value of the wall and windows, estimating the type and thickness of materials for the information available. You can make reasonable assumptions based on the years the blocks were build where information is not available. • If applicable, assume a U-value for the roof construction of 0.16 W/m2K and for the ground floor construction of 0.25W/m2K, calculate the conductive fabric heat loss coefficient for the room. (If the space on the other side of the wall/floor/ceiling construction is another heated space then ignore them, as there will be minimal heat loss between these spaces, through this construction element.) • Make an allowance for thermal bridging in terms of W/K. • If the room required a ventilation rate of 8 l/s/person for the maximum expected occupancy calculate the required air change per hour. Calculate the expected heat loss (in W/K) for such a ventilation rate. • Climate data for the area indicates that the average solar energy available per square meter in the different directions is: South: 36W/m2; East/west: 24W/m2; North: 21W/m2. Estimate the thermal transmission factor for the glazing in the room and calculate the solar heat gain that can be expected. • Provide reasonable values for heat gain from occupiers, (Qo) and heat gain from lighting end electrical equipment (Qi). CIBSE guide A should be of help. • Write the heat balance equation for the space in its simplest form. • Determine the average heating power required for the space and the estimated energy used for heating in a season assuming an average external temperature of 7°C. • You can assume the price of gas for UWE is £0.08 per kWh. 0 – 2R018 1–3Q22 2 – 2R022 3–4Q68 4–4Q50 5–1R21 6–2R04 7–4Q69 8–2Q48 9–4Q05 1. Clearly work out the heat balance equation for the space you are assigned. Show your workings. I direct you to the ‘Worked Example’ given to you on blackboard as a key document in helping you through the process. Using excel is a good way of ensuring the accuracy of your calculations and easily fixing mistakes, but remember you need to show the workings so you still may need to do some long-hand. Calculations should have no commentary (other than reference to the sources from which you took relevant data) and be presented under the following headings in the order given below: Room plan and External wall construction Wall u-value calculation Fabric heat loss calculation Ventilation heat loss calculation Thermal bridging heat loss calculation Solar heat gain calculation Occupant heat gain calculation Incidental heat gain calculation Electrical heat gain calculation Heat balance equation in its simplest form determining heating requirement Heating cost calculation Disjointed and patchy Complete and high quality 3 6 9 12 15 18 21 24 27 30 2. Being able to work your way through the equations shows neatness and concentration as it’s a long process not a complex one, only requiring basic BODMAS. However, just as powerful is being able to comment on the results with meaning. Write a 300 word (one page) commentary on the heat balance in question 1. Why should energy efficiency measures affect the equation? Give an example of upgrading the glazing to high performance triple glazing. Some of you might even estimate the money saved per year and payback time as in the worked example. Comment on the weakness of the equation and why it is just an estimate under ideal conditions. (Hint: it means understanding thermal mass and dynamic calculations) Disjointed and patchy Complete and high quality 3 5 8 10 13 15 3. Study Skills bonus – The brief for this final marks will be given closer to the submission date. The bonus marks are designed to help steer students into developing specific study skills. The study skills students will need will vary from group to group and year to year. As such this Study Skills Bonus section will vary in its content to concentrate on the skills that will most benefit this year’s students. Poor Good 12345