Live from Rural Studio Red Barn, it’s the Thermal Mass & Buoyancy Ventilation Research Project Team! The team, though they might come to miss the cat interns and the AC, is so excited to be back on campus. For health safety measures, the team has an entire studio room to themselves which also acts as a convenient hiding place from Andrew Freear. The TMVRP Team is being as safe as possible as they sorely missed Newbern and the Rural Studio staff and faculty. This week the team will cover their pod design process while bombarding you with design iteration images. Enjoy!
Designing an Experimental Building
As the Wood and Concrete Test Box Experiments, formally known as the Chimney Experiments, chug along the TMBVRP team has been designing their test buildings. Like the Mass Timber Breathing Wall team’s nearly completed test buildings, the TMBV test buildings apply their research at a small building scale. After some initial testing, the TMBV test buildings can be used as 3rd-year accommodations. The Studio calls the funky dorm rooms for 3rd-years on Morrisette campus “pods.” In true Rural Studio fashion, the design of these pods is an iterative process, but must always be grounded in what is necessary for the experiment.
Now, science experiments are not only driven by the hard data we might get out of them. Many experiments are experience-based, especially when trying to describe a phenomenon to the public. Think about going to a science museum, touching the electrified ball, and your hair shooting up from your head. Static electricity makes a lot more sense to you when you experience it rather than if you had read data and looked over graphs explaining it. The design of the Thermal Mass & Buoyancy Ventilation pods revolves around both data and experience production.
A main objective of the Thermal Mass & Buoyancy Ventilation Research Project, while being rigorously tested for data currently, is for inhabitants to experience the comfort of the cooling and ventilation effects. Let’s journey through TMBV Pod design as the team tries to focus on both experiment and experience!
When massing the general size of the pods, the team can use the Optimal Tuning Strategy app. From the app the team knows the amount of surface area needed for the thermal mass, the thermal mass thickness, and the size of the ventilation openings based on the information they input which is how much ventilation, temperature change, and height the pods need. General massing schemes are quickly generated from these design parameters. The team is creating massing schemes for two to three pods, one with concrete thermal mass walls and one or two with wood ones. These massing schemes also explore whether to share walls in a multi-unit pod or separate the pods to highlight the material difference within. As long as these massings can fit the app outputs, a 3rd-year, a bed, and the sensors we need for testing that’s all of the design work to be done, right? Nah. While these are sleeping quarters for students, they are also examples to the public of how spaces that utilize thermal mass and buoyancy ventilation can feel.
Introducing the Cooling Porch
To create a peak TMBV experience, the team is elevating the pods! This will allow for a gathering space underneath the pods where anyone can sit and enjoy the cool air being naturally pumped out of the spaces above. The TMBVRP team calls it, the “Cooling Porch.” Here, students, faculty, or clients interested in the system can experience the effects of TMBV without lingering too long in a 3rd-years dwelling. It also highlights one eventual goal of the work; naturally cooled public spaces enjoyed in the Black Belt. The Cooling Porch is located underneath the buildings because the TMBV system operates in downdraft during the day. This means during the day the air is pushed out of the lowest opening as opposed to at night when the air is pushed out of the highest opening. Therefore in a typical building, you would not need to elevate the structure above the ground, you simply need a low and a high ventilation opening. The TMBV Pods’ ventilation “top and bottom” openings are so literal for both the quality of the experiment and the Cooling Porch.
Why the pod is elevated may now be clear, but why do some of these drawings have such tall chimneys? The exaggerated Chimneys are an experiential detail like the elevation of the spaces. They are not necessary for the experiment or the TMBV strategy to work. A typical building would not need tall Chimneys to utilize Thermal Mass and Buoyancy Ventilation, just as they would not need to be elevated. The tall chimneys are specific to the Thermal Mass and Buoyancy Ventilation Research Project Pod as they highlight the ventilation created by the passive strategy. This is another detail, like the cooling porch, that will work as an experiential demonstration of the research. Increasing the overall height of the structure, beyond what surface area is needed, highlights the ventilation aspect of the system.
The elongated chimneys do not increase the amount of air ventilated through the spaces, it does increase the speed of the air as it exits the spaces. The faster the air exits the interior space into the cooling porch, the cooler the porch space will feel. Think of it as the difference between being hot with a fan and without. Moving air always increases the cooling effect and therefore the cooling experience. This increased airspeed will help with explaining how Thermal Mass and Buoyancy Ventilation works as visitors and users will be able to clearly feel the cool air rushing out.
Now, the design is focused on three main outcomes: replicating the experiment so TMBV works effectively at building scale; providing a comfortable and useful space for sleeping and demonstrating; and creating a space below the buildings in which people can gather and experience the strategy working for long periods of time. What comes next is siting and about 1,000 other details.
Siting began by looking at various locations around the Super Shed and the existing pods. The Team began exploring the pods as stand-alone buildings. Next, the team explored how they could utilize the roof and structure of the Super Shed. While investigating stand-alone sites, the team also did some surveying of the Super Shed. Both options have benefits. A stand-alone structure would allow for greater height, not being capped by an existing roof, so a more generous cooling porch space and higher airspeed into that space. The existing roof of the Super Shed, however, would provide constant shade and rain protection making it a very similar environment to the Chimney Experiments in the carport at HomeLab. Both have experiential and experimental benefits that the team is still exploring.
The Thermal Mass and Buoyancy Ventilation Team has a lot of hard work ahead, but nothing makes it better than being back in the Red Barn. Seeing the old and new faces of Newbern, even from a social distance, is exciting and motivating. Thanks for Tuning in!