Full mechanical heat recovery ventilation (HRU) would need to be employed if higher grade air filtration is used while still aimingto achieve BB101’s low energy requirements for ventilation equipment. Areas with high air pollution from traffic may want to consider local road closures or diversions adjacent to school so other forms of unfiltered air ventilation, including natural ventilation, can be used.
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Microelectromechanical systems, or MEMS for short, are a combination of electronic and mechanical hardware. Every MEMS sensor consists of tiny silicon structures that are machined into a silicon wafer with a special type of etching process. For example, under a microscope, an acceleration sensor’s structures look like gossamer combs arranged in opposing and interlocking patterns. Some of these fine comb-like structures measure a mere four micrometers across – that is just a tenth the size of an ant’s leg. The force of a car accelerating or braking squeezes these combs. This changes the electrical voltage between the individual teeth, transforming a mechanical force into an electrical signal. A control unit interprets this signal and processes it further as a digital value. Bosch developed the manufacturing process behind MEMS technology nearly 25 years ago. It still forms the basis of today’s production runs, which take up to 14 weeks and entail several hundred steps. These tiny sensors are manufactured under exacting cleanroom conditions, as even the smallest airborne particles would disrupt their production. One cubic foot of air – that is about 30 liters – may contain no more than one particle weighing half a microgram. To put this into perspective, that equates to a cherry pit in Lake Constance – or 360 million bathtubs.
In Maharashtra, it appears the rural jobs scheme is being implemented on paper alone. Contractors, government …
The dimensions are 60cm x 24cm x 43cm, so technically it’s not suitable as carry-on hand luggage, but it should squeeze into a boot of a car or may fit on the luggage shelf on a train.
The HVAC contractor explained to me that there was a leak somewhere in my heating system, which slowly bled off pressure into the attic-heating hot-water circuit. Due to the amount of air in the hot-water pipe, the circulator pump simply couldn
Read on for new holiday-friendly pushchair launches and updates for 2019, or head straight to our pushchair reviews to help you pick a lightweight pushchair that’s also a Best Buy.
What’s the benefit of living in this type of green residence? “The residents of Sol Lux Alpha can live in a sublime luxury and comfort, with the peace of mind that their lifestyles are part of the solution to climate change,” John Sarter, the developer of Sol Lux Alpha told Haute Living. “The energy system ‘brain’ of the building generates approximately twice the energy required for all living systems, enabling up to 30 thousand miles of emission-free EV driving per year for each home. The indoor air quality afforded by Passive House certification and the energy recovery ventilation—the lungs of the home—adds to the owner’s quality of life potentially even extending their life by this superior air quality. Practically airtight construction, excellent insulation, and thermal modeling create an ultra-quiet interior contributing to an exceptionally relaxing living experience in the urban context.”
The 10l/s per person rate is significant because many studies have found buildings with ventilation rates lower than this figure are prone to “sick building syndrome”. This is a group of symptoms that include headaches, poor concentration and fatigue, and is attributed to a poor-quality indoor environment. However, studies have shown that there are minimal or difficult-to-quantify additional benefits to increasing the ventilation rate significantly beyond the 10l/s guideline.
At these airflow rates, systems are typically rated with 90 Pa available external static pressure, but they are also quite capable of providing up to 275 Pa of pressure with an airflow of 1,200m³ per hour on the larger units. Note that a pascal is deemed to be equivalent to one newton per square metre.
Monitoring for Sound, Ultrasonics, and Vibration There are many ways to detect and monitor levels of ultrasonic sound and/or low frequency vibrations. As discussed above, we as humans cannot detect very low frequency vibrations or any levels of ultrasonic sound, which is why conformance monitoring in labs is highly useful.
I kept taking long silly photos of this Fresh-R unit because they ran a steamroller over an HRV and squished it down so that it fits in an 18cm (7") wall. It is an incredible bit of engineering that would be terrific for small apartments. In the condo biz, every square foot of usable space matters, so this really pays for itself.
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