And if the last four are in a “typical” range for a commercial office setting — roughly, little to no air speed, RH between 25% and 55%, people seated at their desks (so having a low metabolic rate and dressed for work) — we can characterize thermal comfort just by measuring air and mean radiant temperature, adding them together and dividing by two. My questions are: - How to estimate the hourly radiant temperature of each part of the square and the surrounding buildings? I lined up the three MRT globe devices and then placed the fully energized radiant panel (Image #8) just behind the devices and recorded how well they tracked each other and if they responded within the same time frame. In a high-performance building, such as a Passive House, the MRT will be higher. Humphreys: The required parts include a ping-pong ball and a mercury thermometer. (The final report was titled I really knew next to nothing about the science of thermal comfort. (Eq. But because there are…Author’s Note: I can’t even start this blog before thanking Lew Harriman of Mason-Grant Consulting. If solar radiation is present in a room that would certainly contribute to the MRT. Radiant temperature The temperature of a persons surroundings (including surfaces, heat generating equipment , the sun and the sky). Their triple-glazed windows will ensure the interior pane of glass is warm, so you’ll be comfortable next to them even on a cold day. It, along with the ambient dry air temperature, determines how thermally comfortable a space is. The mean radiant temperature (MRT) is considered the most problematic variable to estimate in the assessment of human biometeorological comfort (Kántor and Unger2011). This is called the “operative temperature.”A thermal comfort measuring station is pictured in Image #2 (below).
And as a heat stress device, the Extech HT200 gets used outdoors quite a bit. I figured that if either or both of the do-it-yourself MRT globes were even close to the Extech HT200, that would be terrific.Image #9 shows how I tracked the background air temperature as I tracked the devices being closely exposed to the heating panel.Before being exposed to the radiant heating panel, the Extech HT200 and Goudey’s MRT globe were reading within about a degree and a half of each other (see Images #10 and #11).
Is there an easier — and more affordable — way to measure MRT, which is so critical to assessing thermal comfort?My colleague and friend Brian Just from Efficiency Vermont let me borrow his Extech HT200 so I could compare a couple of “homemade” globes and see how they did.Image #4 (below) shows an MRT globe built by my good friend Howdy Goudey from the Lawrence Berkeley National Laboratory. It's worth noting that ALL of the MRT globes I saw when researching them were matte black. This leads to other benefits – for example, because the heating system doesn’t have to counteract the cold glass effect, the conditioned air can be delivered to the living spaces on the inboard side of the rooms, rather than at the exterior walls. I've never seen such a device in a home but apparently they are available commercially. One point I'd like to make about the short vs. mid and long wave IR. Howdy has a reputation as an engineer who can build just about anything; Howdy let me borrow his do-it-yourself MRT globe to test it against the Extech HT200.But I wanted to go even lower tech, so Howdy referred me to a 1977 research paper by M.A. It consists of three air temperature sensors (located at different heights) and a mean radiant temperature (MRT) globe positioned at about the height of a seated person. A thermal comfort measuring station is pictured in Image #2 (below). Inside buildings, only lower energy, long-wave IR is generated, and color does not matter.My little test suggests that a do-it-yourself MRT globe built out of a spirit-filled thermometer, a ping-pong ball, and some matte or flat spray paint will do just fine.I bet Fanger would be proud. • The mean radiant temperature [°C], which is a weighted average of the temperature of the different surfaces (walls, ceiling, floor and windows) in a room seen from the position of the occupant • The air temperature [°C] in the room • The relative humidity in the room
That’s because the cold interior pane of glass in that window is literally sucking warmth away from us, or, to put it more accurately, our bodies are emitting heat to that cold surface, which causes us to feel cold. And in terms of speed of response, the Extech HT200 and my do-it-yourself device responded pretty much equally fast to the radiant heating panel, with Goudey’s MRT globe taking up to 2 minutes longer to “catch up” with the other two.The Goudey MRT is the largest of the three devices, and that may explain its slower response time. It’s hard these days to come by mercury thermometers, so I thought I would try a “spirit-filled” thermometer which cost about $7 at a local hardware store (see Image #6).Image #7 is a photo of a test I performed. - What temperature should I consider for the sky?
It consists of three air temperature sensors (located at different heights) and a mean radiant temperature (MRT) globe positioned at about the height of a seated person.
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