Monday, February 7, 2011

A2–Student Suggestions

Here’s the compilation of your suggestions offered as part of the extra credit.  I’ve put in a few comments.

Jim Mitchell

 

Suggestions for Improving the Assignment

1. This particular assignment gives good exposure to the integrative processes that occur between the owner, programmers, architects, and engineers in building design. In order to improve the effectiveness of this assignment, it is suggested that the architectural designers for a building be encouraged to discuss their concepts and ideas for the building to the engineers during their design process, and not just after the design is complete. This would help the designers to better determine aspects of the building design that are of special interest to the engineers. Also, since many of the buildings assigned require unique and expressive designs in order to meet the owner's intent for the building, as well as the building's overall aesthetics, students should be given a formal review of Revit Architecture and perhaps a short tutorial of other useful techniques that can be used to generate relatively enhanced and/or complex designs using such a program. This would allow for the time spent in trying to adequately exhibit the designers' vision to be used, instead, on focusing on the considerations that should be given to the engineers designing for the building.

JEM – Good suggestions.  I wish we had the time to do so.  It’s always a balance.

 

2. A major aspect of assignment 2 which hampered the assignment as a whole was the inclusion of the fire protection. This segment seemed more at home with the previous assignment, specifically using codes to come up with design restraints for the particular system. Although including it in this assignment does make some sense, as a general building design would have been made, so the specifics of the system can be looked at in more detail and customized specifically for that particular building. Conversely including it with this assignment detracts from its main objective, the architecture. This doesn't occur with any of the other assignments and you could argue its unfair for the architecture to share its segment with something else.
So the overall improvement to this assignment would be to remove the fire protection and place it in assignment 1, possibly splitting that assignment into two or increasing the permissible for assignment 1, and having architecture as its own separate assignment, this could allow for better and more detailed designs to come through, giving the students increased experience with AutoCAD, Google Sketch-Up and/or Revit, possibly, if time permitted, including a class on one or two of the programs to increase the students knowledge.

JEM – This is a valid suggestion.  I’d argue, however, that fire safety is extraordinarily important during design, particularly assuring that occupants can exit safely.  That doesn’t really come into focus until you’re involved in physical design.

 

3. This assignment was an introduction to the first process of a design. Material was chosen and the site was organized due to surrounding environment and sunlight. The problem with this comes from possible assumptions made by the architect that don't in many cases work from a structural standpoint. Maybe if there was a class before presentations where the architectural groups sat down with the structural groups to talk before designs were "finalized" at this point in the project. Another suggestion might be a way of breaking the points assigned to each section up. The design of the building while it doesn't take as much numerical analysis, it does take up a lot of time and covers a large amount of the grading criteria. This section is fairly hard to incorporate every member of the group, making it hard to assure finalized plans were used for the others pieces of the project.

JEM – as with the prior suggestion, integrated design is generally a better process in practice.  It’s what you’ll undertake in Senior Design.  Nonetheless I believe there is much to be learned from seeing the consequences of sequential design.

 

4. The "Comparison to the Program" section of the assignment is very general. While this gives the students a lot of freedom, a little more direction would be helpful.

JEM – I suggest feeling free to ask in class about these kinds of issues.

 

5. This assignment was useful in getting students to collaborate and think about the specifics of architectural layout.  It also helped introduce us to the requirements of fire code and explored the intersection of architectural and engineering requirements. In order to simplify and facilitate the integrated design process, groups should be required to build a model in the same program, such as Revit, in the future.  A common platform for design would give successor groups of engineers a building model to begin with without having to redraw it, or measure dimensions manually and transfer them to their work.  For example, some groups worked in Sketchup or AutoCAD on A2, which means that the structural engineers on that project have more work to do in A3 and their design will not likely match up perfectly to the architectural plans.  Using a common platform would also prepare students for professional work, in which tolerances among architects, structural engineers, and HVAC engineers must be nearly as tight as the tolerances within any of those disciplines.

JEM – Good idea.  My justification for not insisting on it is twofold.  First, we’re not yet really committed to Revit as a program – many people have varied prior experience.  Second, I’m not convinced that in early design (which this is) that Revit is the best tool.

 

6. Although some codes, such as the International Building Code and local zoning ordinances were utilized, there should a greater emphasis on the legal and political restrictions that face building projects.  For instance, if basements are being constructed in urban settings, is underpinning going to be an issue?  What added cost does that bring to the project?  Would it be more efficient to design the building a different way to avoid this type of problem?  The way buildings are designed are rarely just up to the engineer and architect, and often affected by legal and political factors as well, so this should be factored into the design stage.  In addition, more emphasis should be put on local codes.  Boston has different requirements for buildings than Arizona does.  While the IBC covers a general range of issues, other factors such as seismic activity, heavy wind loads, snow loads, and the like should be more integrated into the design stage of the building.
The logistics of mechanical systems in the building should be given greater consideration as well.  When designing the floor plan, totaling the gross area for the building, and determining the cost of construction, these mechanical systems play a major role.  For example with our building, we changed the original program to include a mechanical room on every floor instead of one every five floors.  This made sense to our group from a localized control and efficiency standpoint, but how these systems are put together in such a large building is hard to design for at this point in our careers.  We should be given guidelines such as the amount of space needed for duct work, plumbing, and MEPs.  We estimated that 2ft between the floors would be sufficient, but that was just intuitive.  Like the total square footage of the building was increased by 35% for circulation purposes, similar ratios for mechanical systems would be helpful.
Another tool that would help make this project easier would be a 1-2 day tutorial in the class on how to use Revit or another similar program.  I know there was a short tutorial on it in AE391, but only briefly touched on how to use the program.  Revit is a very useful modeling tool that a lot of companies use, and it would be very helpful to have everyone in the class at least proficient with it.  It helps visualize how the design of the building fits together, increasing awareness of system compatibility and feasibility.

JEM – Again good idea, but I plead time limitations and the issues discussed previously.

 

7. This project was meant for design and codes regarding design. Within the fire protection section, searching for code was a big task. The International Building Code 2009 is a long document that has many tangents to get lost in. To improve the pertinent information needed for egress, occupancy, stairwells and sprinkler systems a firm understanding of terms is needed. In class, it is suggested, that a brief explanation of the IBC would help students get on the right track to finding what information is required. Also going through the table of contents would help the student. A quick overview of the chapters or groups of related chapters can reduce the time spent loking for information and increase time understanding the material within the chapter. The IBC has many useful codes and can help refine and integrate the design to the codes required. For design, the use of AutoDesk Revit is the best program to use. In the cad lab many of the computers had problems with saving the designs created. IRT should be able to install Revit correctly and have this program ready for students to use.

JEM – I apologize for the computer problems in class – IRT is working on it and think it’s nearly addressed.  Also, please feel free to ask in class for guidance on codes.  I’d be glad to provide it.

 

8. The assignment should be geared towards new architectural trend, including some LEED rating analysis, as well as other green technologies. Buildings could be reduced in size so that more detailed analysis and designed can be produced in the short period of time.

JEM – Yet another good idea.  My response is that at this early stage of your engineering design careers I’m not ready to make that kind of restriction, although I certainly encourage that kind of thinking.

A2–Architectural Design–Grader’s Comments

1. Most students did not include quantitative suggestions for future engineers. Even when suggestions were made, they did not cover all major building systems – utility access and possible duct provisions were often left out of the analysis.

2. Most students did not explain the information they used for the fire protection program, or why they came to the conclusions they did. Teams also forgot to call out critical information on plans with regard to fire protection, such as maximum distance to exit and fire separation walls between different occupancy types (if more than one).

3. Many teams forgot the basics of presenting plan sets of drawings. North arrows, dimensions, scales, clear section cuts and elevation views are important! As viewers cannot be expected to extract major information from the model themselves, make sure all relevant information is in the finalized presentation/on the website.

4. A few teams forgot to do an in-depth analysis of critical areas in their buildings

5. The majority of the teams did very well on the extra credit.

6. Most teams were able to provide specific information to validate the changes they made to the building programs, but remember that these changes will also affect other building systems and their effects must also be identified and addressed.

7. Many teams included graphics that were of too low resolution to be of any use to the viewer.

8. Only a few teams remembered to label their graphics and cite references if any external sites or graphics were used.

 

Comments the Graders Made to the Instructors

The average was 96.5 with a median of 97 and a range of 12 - this indicates most teams did well on the assignment and scored within a tight range. Also encouraging was the fact that the median grade for the teamwork part of the assignment was 5, indicating that most students completed and did well on the evaluations.

Still, however, nearly a quarter of the students did not even attempt the teamwork evaluation assignment.

Tuesday, January 18, 2011

A1–Your Comments and Suggestions

The graders gather all your comments and forward them to Professor Dasaro and me.  What follows are my reactions to some of your comments and then the comments themselves.

eQuest

  • Several of you questioned using eQuest because it wasn’t detailed enough.
    • Comment:  knowing the approximate energy usage for a building as well as it’s overall equipment information is a great baseline for later developments.
  • One group advised against using locations outside the US because there aren’t weather files available
    • Comment:  As with the first issue, using a place that is approximately like the chosen one will provide worthwhile information even if it isn’t perfect.  Obviously on a real project you would put some effort into getting better weather information.

Costs

  • There was an excellent suggestion that addressing costs would be worthwhile at a more detailed letter.
    • Comment:  Yes it would.  I have downplayed cost analysis because of the time involved.  You are most welcome to get quite involved in that during senior design.

Spreadsheet

  • We received many excellent, detailed suggestions on improving it. One person suggested, for instance, adding columns so that internal HVAC loads weren’t the only ones addressed in it.  Others made specific suggestions about graphs, scrolling etc. 
    • Comment:  Agreed, All are worthwhile.  This template was intended as a starter with the expectation that you might choose to improve it.  If you want to send me an improved format(s) for the spreadsheet I’ll be happy to update the template and give credit.

Grading

  • One person suggested adjusting the points to reflect even workloads between team members.
    • Comment:  I cannot agree with this one.  The work world often requires that people overlap on certain aspects of a project.  It’s not about even division – it’s about getting the project done.

Jim Mitchell

The compilation of suggestions follow:


Suggestions for Improving the Assignment

1. Remove the Equest portion, unless more information is known about the building's design. I felt that too many assumptions were made regarding construction information for walls, windows, and roofs which may lead to an inaccurate analysis. This was especially true for a temporary structure where it is not a standard design.

Only have sites within the United States and territories. It was sometimes difficult finding the necessary information for the site. Haiti lacks building codes and the IBC only has site information for the United States and US territories. Haiti was also not available as a site location for the Equest analysis. We had to substitute weather data from Miami, FL which is a few hundred miles north of Port-au-Prince.

2. More accurate information and inputs with details on eQuest Stimulation analysis will be helpful in analyzing the loading information especially for HVAC program design.  The 15-20 CMF design of the HVAC program will be higher for the reality.  More comparison of existing similar building structures will be helpful.
The building is designated for graduate students dormitory, therefore the majority of the design will dedicated to the dorm room and common place such kitchen and bathroom.  The dorm room is designed for single person with individual bathroom and sink.  The dimension of 10x10 might be slightly smaller.
Over all, the design can be improved with more in depth analysis along with the consideration of seasonal occupancy and different area/zoning occupancy.

3. In this assignment, more details could be added to each program. For architecture, the overall design and theme of the building could be included. This would allow for a better transition for the next group.
I would also add a power point presentation for the excel spreadsheet. The excel spreadsheet was a great idea but definitely needs more clarity. The notes for each cell were somewhat helpful, but were very unclear in some parts.

4. The Assignment Description did not require to prepare programs neither plumbing nor fire protection. While plumbing is specialized only in some types of buildings and somewhat similar system can be used in most of the buildings, fire protection codes and requirement vary greatly with different types of occupancies and sizes of buildings. Building codes go into great detail in covering all of the fire protection aspects. I strongly recommend including at least fire protection  into the program, and if a class could be added to the assignment, plumbing should be added as well.

There should also be an actually called out Site Programming. Currently site can be covered in both Architectural and Structural Programs, but if there was a separate Site rogram required, the overall program would be more complete and more clear.

The HVAC fields for internal gains proved confusing for a number of groups.  The field asking groups to enter heat loads/SF should be explained.  While the spreadsheet is asking for general estimates based on experience, this is not easily understood, as a number of groups first assumed we must do some Btu/hr calculation rather than simple estimation.  A better explanation of these cells would solve this problem.

5. The assignment is structured very well.  Students are able to begin understanding initial building design and programming using spreadsheet and building information modeling programs to help determine data specific to a project, rather than depend on data from code and assumptions alone.  This is a crucial step in sustainable design.  In this assignment, in the HVAC portion in particular, energy conservation studies can be done quickly using results from the eQuest program output, and high efficiency systems and setups can be conceived using basic engineering and design intuition.
Students in the future should be required to analyze basic costs of the components in each system in order to understand the relative cost of some items to the overall cost of the building design and construction.  They should also incorporate an integrated design mentality even at the programming stage when coming up with values and numbers in the spreadsheet.  In other words, students should be given more time to study the accuracy of the numbers that they input into the table and understand how certain aspects such as cost, area required, weight, cooling load, and maintenance frequency of things in a building affect each system's layout and design.  Knowing how the systems interact in this way can help with the integrated design process.

6. Suggestions for the assignment in the future:

    1. Improve the spreadsheet format so that it's not suggested that HVAC internal loads are the entire loads of the building.  Create formulas to calculate HVAC design loads based on peak information extracted from eQuest.
    2. Perhaps split the assignment into two parts.  The first would be a very short segment that was entirely architectural programming.  Each team could come up with a few different programs that might meet client demands.  At the end, each project would have a set architectural program-- a basic building layout and space allocation.  The second phase would be structural and HVAC design, which could proceed with more clarity and specificity if at least the contours of the building design were already set.  Of course, the process should ideally be collaborative or at least iterative.
  1. One way to improve this project in the future would be to adjust the point breakdown in the grading of the assignment so that depending on the number of group members per group, the points would split up evenly so that nobody felt as though they had to shoulder a majority of the work. This could teamwork within teams knowing that everyone in the group was responsible for the same amount of the project as everyone else.
  1. Remove the Equest portion, unless more information is known about the building's design. I felt that too many assumptions were made regarding construction information for walls, windows, and roofs which may lead to an inaccurate analysis. This was especially true for a temporary structure where it is not a standard design.

Only have sites within the United States and territories. It was sometimes difficult finding the necessary information for the site. Haiti lacks building codes and the IBC only has site information for the United States and US territories. Haiti was also not available as a site location for the Equest analysis. We had to substitute weather data from Miami, FL which is a few hundred miles north of Port-au-Prince. 

Functional Enhancements to the Programming Spreadsheet

1. Columns were added to the structural section for maximum spans and deflections. The plumbing section was modified to have fixtures and fixture units per room with the total fixture units for each room type. All display tabs were filled out using the example format from the Architecture display tab.

2. Overall the spreadsheet was easy to use, and streamlined the process of programming the building. It was well designed and simple. Something that was occasionally confusing was how the scroll bar didn't include the two leftmost columns. However, once I adjusted to this it was actually helpful since it allowed the room title to be on the screen no matter what section of the spreadsheet was being worked on.
One suggestion for improvement that comes to mind is a bar graph or pie chart that continuously updates, and shows the percentages of spacial allocations. The graph would show what percentage of the building is occupied by lab space, office space, bathrooms, etc... Displaying a visual representation of the breakdown of the spaces in the building could help to ensure that the building is designed with the appropriate space for each function.
Another thing to consider is including the site dimensions in the spreadsheet. The pros of this would be that it might create a more realistic assignment, since the site is usually decided upon before programming begins. However, this would make things more difficult and dampen creativity by making the class design around an additional parameter.

3. The spreadsheet was a great tool to use. Inputting data on the spreadsheet in the beginning was very hard. The beginning page was very overwhelming. This could be solved if  the spreadsheet was broken up more. Instead of beginning with a huge data sheet, the different systems could be broken up in the beginning. The final data sheet should use the  "LOOKUP" function from each system data sheet, rather than the other way around

4. Spreadsheet template was created around 2002 (I believe). Some additional information should be included to accommodate the latest trends. There should be a LEED Scorecard included. Also, energy requirement cells should have conditional color coding included to alert programmers when their design is reaching inefficient values.

One example, which my group encountered, was square footage and cost estimate for the parking lot. There should be a Site Program on spreadsheet as well to include site preparation costs, since those costs cannot be estimated within the same range as the building.

5. The spreadsheet is set up very well and includes most of the required building programming information requested by the assignment guidelines.  However, there should be some aesthetic improvements that could also improve the functionality and organization of the spreadsheet.  Each building system studied, for example, should have its own outlined box or border so that the dividing line between each major section can be more easily discerned.  Also, changing the totals row location from atop all of the data to the bottom of the data would contribute to a more organized and smooth-flowing document.  In addition, the cells that are not to be edited by the students should be locked so that no calculated values can be deleted by accident as the spreadsheet is edited.  Lastly, there should be a large text box above all of the systems for notes that may come up during the assignment that some students would like to share with the others.  They would act as small pin boards for organizational purposes.

6. The program excel sheet seemed a little plain. When assuming room type and additional cost per room the values were picked to a random extent, if we were given a normal additional cost for each room type i think the values would have been a little more realistic. When choosing additional prices, we assumed a certain amount and type of equipment within the designated room and then assigned a price to it, other rooms were based off the first assumed additional price. I feel as though our background with this type of estimation is a little shallow and a more generic choice might help, or if we at least knew what the 50,000$ that was thrown into the original program sheet was assumed for.
As can see from structural section the live loading we found was considerably less than that of the supplied program. This difference helps explain our confusion on where some of the input values came from.

7. Improvements to spreadsheet:

    1. Throughout, improved layout, adjusted column widths, readability.
    2. General tab, added places for coil leaving air temperature (LAT) for heating and cooling seasons.
    3. Program Input tab, electrical section.  Changed W/SF to "Target W/SF" then created extra column to use the lumen method to calculate the number of fixtures needed based on three-lamp (9000 Lu) fluorescent fixtures.  Added extra column to calculate true FC that would be provided by this many fixtures, and extra column to calculate true energy consumption per SF if this many fixtures were employed.  Even though actual consumption per SF was less than the target, target was still used for calculating demand as a safety factor.
    4. Program Input, HVAC tab.  Changed all load titles to be explicitly labeled "Internal" loads, since the spreadsheet as set up seemed to imply these were total loads, which is very definitely not the case.  For a building of this size in Chicago the primary loadings will be external in both winter and summer.  Changed "Total CFM" to "Total Ventilation CFM," since the CFM calculated thus only meets ventilation requirements; in fact the CFM needed to keep the space sufficiently warm is based on expected load and the LAT of the system.  This value was calculated based on the peak demand output of SAP runs.
    5. Architecture Display tab.  Added pie chart for percentage gross area allocated to each space.  Added extensive comments describing program of each room.
    6. HVAC Display.  Added system type, heating capacity, cooling capacity, fan size, expected distribution system, and estimated annual heating and cooling energy use.  Also added chart for internal loads as a percentage of total loads, by room.
    7. Electrical Display.  Added true illuminance and fixture number calculations as described above.
  1. Columns were added to the structural section for maximum spans and deflections. The plumbing section was modified to have fixtures and fixture units per room with the total fixture units for each room type. All display tabs were filled out using the example format from the Architecture display tab.

A1–Grader’s Comments

1. Most students did not include total kVA requirements and had limited discussions about emergency power requirements.

2. Most students attempted the extra credit section

3. For many teams, more detail was needed on vehicular circulation, exits and entrances.

4. Many assumptions were left unjustified – when code-specified minimum requirements are used, the justification would be that the client did not want to adjust these criteria or have special requirements of their building.

5. Most teams uploaded the building program spreadsheet and presented information that was relevant to their successors.

6. Some teams took the initiative to create a rough layout showing adjacencies, even though this was not an explicit requirement. However, some teams did not include the adjacency at all.

7. A few teams did not prioritize integration goals and/or quanitify them.

8. Most teams forgot about the electrical program in the integration section.

Thursday, January 6, 2011

Ventilation Rates

Question

On the spreadsheet, ProgramInput tab, column AE is CFM/SF.  What is this column?  I can see two possibilities:  1) you're using the more recent ASHRAE 62 where the ventilation is a combination of CFM/SF and CFM/Occ.  or, 2) this column is supposed to capture thermal load.  But the latter would require much more detailed calculations, involving the U-values of building assembly, solar insolation, storage effects, and different procedures for summer and winter.  In other words, more than one column to calculate, and also some functional dependence on the sensible and latent loads (not a totally independent user-input).
Basically I'm wondering what the CFM/SF column is supposed to capture.  And if it's not for thermal load, is there any way to capture thermal load on the spreadsheet? 

Response

When I set the spreadsheet up I was thinking of CFM/Occ, but wanting to in some way turn that into a xx/SF. I guess the result was somewhat of a “half-way-to-somewhere”. The right thing is, of course, two columns, one being CFM/SF and one being CFM/Occ with the user choosing whichever is appropriate – both are used in practice.

Thermal load from interior sources could certainly be estimated as the sum of occupant load, lighting and equipment. The latter two have their own columns in the electrical portion I believe and could be converted to BTUs.

Friday, December 31, 2010

Welcome to the AE-391 Blog

I’ve set up this blog to allow me to post things of interest to all students in the class, and allow them (and others) to comment on them.  This does not replace what shut away behind VistaBB’s walls, but is here in public because I suspect that individuals not in the course may be interested as well.