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Questions tagged [building-physics]

The physics of buildings, specifically thermal conduction, convection, & radiation; heating and cooling; ventilation; transmission and management of water vapour & pollutants

2
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1answer
60 views

Cooling tower for nuclear power plants

Cooling towers for nuclear power plants often have the shape of a hyperboloid. At first glance, I thought that an obvious reason for this would be the smaller sectional area, meaning the tower would ...
4
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0answers
38 views

What approaches are there for demolishing a structure and how is an approach chosen?

From my office on the 21st floor of a building in Vancouver, BC two parking garages in the process of being demolished are visible. A third is just out of view a few more blocks away. One of these ...
2
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0answers
16 views

Looking for something to reflect ultraviolet light at extremely low wavelengths

I have been working on a product that involves the reflection of low wavelengths of UV light (200-250nm). However, I have not come across many materials that are able to do so and the high-...
1
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0answers
21 views

Heat storage mass vs. AIR in an ICF house

If we would want to build a family house (ICF) regarding operational costs, should we leave the insulation on the inside, or should we remove it from the inside? If we would remove it, the walls ...
1
vote
1answer
76 views

how would one calculate the % of heat not absorbed by a heat sink?

I'm planning on building a plant growth chamber inside a sealed/insulated 55 g rain barrel, and I'm trying to figure out how much of the heat from my lights will enter the chamber, and how much ...
1
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0answers
25 views

How to ensure natural ventilation through a shaft?

I have a small shaft, 2.5m wide by 4m deep, sunk into the ground. Due to explosion protection I should ensure "natural ventilation" - this is the termgiven in the relevant ordinance, no air flow ...
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2answers
69 views

What are the limits on building very high buildings using certain materials and architectural style?

I played some video games with beautiful environments filled with buildings which can't be found in the real world. And so I'm wondering, would such buildings be even realistically possible to exist ...
0
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1answer
40 views

How to maintain a static negative pressure in a valve?

My target is to create a valve with multiple inlet capillaries. And my output is a pipe of a larger diameter. I do not want to use any electrical systems, and at the same time, I want to maintain ...
0
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3answers
47 views

Ventilation setup high sleeper night cooling

I have a high sleeper in my room (width 3,70m, length 4,50m, height 3,30m) consisting of one large plane (yellow) and one window (darker grey). The plance leaves about 80cm space to sleep. The door (...
0
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2answers
70 views

How do I measure max oscillation of building using accelerometer?

For my school project, I am trying to measure the effect of a mass damper by changing the length of the string (that carries the mass), my setup is similar to the following video: https://youtu.be/...
2
votes
1answer
230 views

Can a neutrally bouyant helium balloon be suspended in air using magnet entrapment?

The above picture is a basic concept of how a levitron toy works. Could the top floating peace stay entrapped in the magnetic field without having to spin if the edges of the balloon keep the top ...
6
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7answers
180 views

How would you move a sail boat with no wind or paddles

If I stood on a sailing ship and had a very strong pair of lungs (possibly motorized) then if I blew the sail would I be able to move the ship forwards?
2
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3answers
97 views

Building a machine from an ideal physics problem

I have a physics professor for whom I'd like to build a machine. Featured in a problem he is notorious for assigning students, originally from Kleppner and Kolenkow's "Mechanics," the machine causes ...
0
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2answers
63 views

Place a greenhouse: how to orient it for the best effect?

I'm looking for the best orientation (North-East-South-West) of a greenhouse (simplifiable as a rectangular solid). My question is more specifically about the sun position effects (over the times of ...
0
votes
1answer
50 views

How do we define the durability as per density?

We define the durability with the equation as seen below. $$x\propto \frac{\text{Cross-Sectional Area}}{\text{Cross-Sectional Area}\times \text{Length} }$$ Hence $$\therefore x\propto \text{Length}...
0
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2answers
82 views

What does this equation mean?

$$\propto \dfrac {\text {Cross-Sectional Area}}{\text {Volume}} $$ I've seen this equation on my textbook (physics). Let us imagine that there are two pen with $7$ and $3$ lenght. Which is harder ...
0
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1answer
39 views

When does window insulation have more impact than attic?

Is there any way to determine either empirically or by convention a rule-of-thumb when one should spend money on insulating windows rather than insulating the attic of a house or building to keep it ...
1
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2answers
90 views

Does attic insulation help cool a building?

Given that hot air rises, it's easy to understand how attic insulation can help keep a building warm; say, in the winter, for example. But when winter changes to summer, does the attic insulation help ...
3
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1answer
73 views

Where to start when studying Architectural Engineering by myself? [closed]

I have this idea of creating my own curriculum for studying Architectural Engineering. I aim at talking with actual architectural engineers in my surroundings and ask them for advice on the topics I ...
2
votes
1answer
91 views

Controlled demolition of a sky scraper?

Sky scrapers are often found in dense urban environments. Is there a known method to controllably demolish a sky scraper with minimal collateral damage?
0
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2answers
53 views

Windproof open doors room design

I live somewhere where it's relatively warm the entire year (around 10ºC is the coldest you'll get in some days during a normal winter). I am dreaming of a house design that I intend to build in the ...
1
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0answers
109 views

equivalent full hours of heating equipment

I would like to know if there is a standard way of calculating the equivalent to a capacity factor but for heating equipment. That is the ratio between the amount of heat delivered during one year ...
0
votes
1answer
351 views

What is the most efficient way to ionize air?

I have a project to convert wind energy directly to electrical energy with no moving parts. The wind will enter a reducing tunnel for concentration, then go through an unobstructing de-humidifier, ...
0
votes
1answer
43 views

Has anyone achieved significant energy savings by increasing the cooling setpoints in retrofit office buildings, in practice?

I have a simulation based research vs. practical experience type question: There are a number of academic research papers available which claim 20% to 40% cooling energy savings by increasing the ...
1
vote
1answer
288 views

Reaction forces in a structure

I have the following structure, in which I am failing to calculate the two reactions: Cz (apparently vertical) and Dz, in the roller support of the beam. The beam length is 7.5 m, the reactions Az, Cx,...
1
vote
1answer
153 views

Rubber band Powered Free Flight Helicopter [closed]

I am building a free flight helicopter for a Science Olympiad competition, and the general rules are as such: https://www.soinc.org/sites/default/files/uploaded_files/Helicopters_2017_Diagram.pdf ...
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0answers
34 views

How to estimate the physical parameters of 40% Cu + 60% Mo alloy?

I need to know, or estimate the physical characteristics of the alloy which consists 40% copper and 60% molybdenum. I know only: Density: $9.62 \frac{g}{cm^3}$ Thermal conductivity: $223 \frac{W}{m·K}...
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2answers
1k views

How to make a pulley system with a mechanical advantage of 0.5 [closed]

Problem Hi I was working for an engineering club and we needed to do this as soon as possible: We wanted to make a pulley system with a mechanical advantage of 0.5 I know that we have to do ...
1
vote
1answer
86 views

Dimensionless Thickness

I have encounter this notion: "Dimensionless Thickness". Does anyone have any idea how to interpret this? One can find such a term here. My interpretation is that the name comes from the fact that ...
3
votes
1answer
100 views

Recreating Focaults Pendulum

I am having issues building a recreation of Focaults Pendulum (basic, inexpensive, undergrad project). At this point, I am going to purchase aircraft cable or suspension cable unless someone can ...
1
vote
0answers
347 views

Why can't current tennis sensors measure actual spin in RPM? [closed]

I'm just curious if anyone thinks this can be done. I assume if it was possible somebody would have done it by now. From what I understand, Hawkeye is the only device that can measure RPM. At present, ...
2
votes
0answers
47 views

Mathematic modeling of an overshot water wheel [closed]

We're working on a project that require some mechanical engineering and electronics engineering. In this project we've to model this overshot water wheel (so the water comes from the left top side and ...
3
votes
3answers
519 views

Tower crane with a cabin on ground level

Pardon me for kind of a stupid question, but I keep wondering. Traditionally, tower cranes' cabins are located at the top of the tower. I can understand why it have been necessary up to ~1990s, when ...
2
votes
1answer
771 views

Why don't we make bricks out of coffee grounds?

Okay, so I've noticed that a lot of people grind coffee, and a lot of companies grind it on an industrial scale. Having produced some of the drink we called coffee, a huge proportion of the mass of ...
0
votes
1answer
900 views

Rubber Band for Belt in Belt Drive system

Looking to drive a series of belts for lateral translation using a series of pallet bands (92" rubber bands about 1" wide). Approximately 16 bands would be driven by a singular band as illustrated (...
5
votes
2answers
121 views

Recoil of hydraulic lift/elevator

I noticed that when a group of people enter in an hydraulic lift/elevator often when the last person steps in the lift/elevator has a small but noticeable recoil: the lift goes down a few mm then it ...
2
votes
1answer
364 views

What's the purpose of these small closet-like-rooms-without-a-door?

I was recently on the UCLA campus (University of California Los Angeles) and I saw the Bunche Hall. I love the design and the architecture of the building. However I saw a little (what I would call) a ...
31
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2answers
11k views

What is the purpose of these diversions in a natural gas line?

The campus where I work has a long covered walkway (~.5 mile) which has several labeled pipes running under the roof (chilled water, fuel oil, air...). All of the pipes run dead straight except for ...
0
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2answers
126 views

Is making a toilet flush backwards problematic? [closed]

The Coriolis effect impacts the way water tends to circle before going down the drain. Many (most, all?) toilets are designed to work with the Coriolis effect. I am considering a line of toilets ...
5
votes
1answer
82 views

Where to insulate Underfloor air distribution system in a temperate climate

I have a proposed underfloor air distribution system (UFAD) for a one level office in a temperate climate. Typically the demand for heating and cooling in this climate is about even for offices. ...
17
votes
3answers
6k views

What is the most efficient means of warming a building with a high ceiling?

Consider a large auditorium, a church, or some other very large, essentially one roomed building with a high ceiling. Suppose that the building has many entrances which enable cold air in/hot air out ...