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1.

Gas detection- Applications of Thermoelectric Infrared Sensors

 

From the “greenhouse effect”, which is due to the constant supply of carbon dioxide (CO2) and other gases into the atmosphere we are aware that heat (which is indeed infrared radiation) can be absorbed by gases. In fact, most gases are able to absorb infrared (IR) light. These are gases consisting of two different kinds of atoms, such as the mentioned CO2, but also CO, NOx and all carbon hydrogens (HC) such as methane, propane or other natural gases employed for heating.
The IR light is capable to excite higher energy levels (excited states) of the molecules (rotational or vibrational excitations) by coupling to the dipole moment of the heteroatomic assembly. Heat energy from the IR light is therefore transferred into the gas – it heats up. Concomitantly, the intensity of a beam of IR light, which passes through a gas volume, diminishes. The intensity loss is a function of the number of active gas molecules in the volume, which means a function of the gas concentration.

 

APPLICATIONS OF THERMOELECTRIC INFRARED SENSORS (THERMOPILES): GAS DETECTION BY INFRARED ABSORPTION; NDIR Jürgen Schilz PhD
PerkinElmer Optoelectronics GmbH, P.O. Box 3007, D-65020 Wiesbaden, Germany
Tel: +49-611-492493; Fax: +49-611-492199; e-mail: juergen.schilz@perkinelmer.com

2.

Grow Your Own Fresh Air with this 3 Plants solution

  A study made by Paharpur Business Centre and Software Technology Incubator Park (PBC™ – STIP) in New Delhi, India, on plants that can improve air quality indoors has concluded that only 3 plants are enough to induce a healthy change.
  In 15 years of trials, Areca Palm (Chrysalidocarpus lutescens), Mother-in-law’s Tongue (Sansevieria trifasciata) and Money Plant (Epipremnum aureum) proved a 42% probability of increasing blood oxygen by 1% if one is inside the building for 10 hours, the incidence of eye irritation reduced by 52%, lower respiratory symptoms by 34%, headaches by 24%, upper respiratory symptoms by 20%, lung impairment by 10-12% and Asthma by 9%.
 

Deserving mentioning is that Mother-in-law’s Tongue Converts CO2 into O2 at night, making it a best fit for bedrooms, where we’ve been told that no plants should be kept there, and that Money Plant is excellent for removing Formaldehyde and other VOC’s.

 

Another experiment was sealing all fresh air and exhaust from the building for 6 weeks and the results were a higher indoors air quality than the outdoors one. Energy costs were down 15% as air less venting was needed to compensate the energy loss in the exchanged air.

Anyways most of us have plants inside our appartments, so there won’t be any problem getting these plants, and it’ll complement (if at all necessary) installing an air to air heat exchanger I covered earlier in my blog. Also consider having a look on this post that presented another option that would be a complementary addition to this one. As quantity, four shoulder high Areca Palms per person will be needed and six to eight Mother-in-Law’s Tongues that are waist high per person. So, you’re creating you air purifying forest…

In a separate study, NASA have concluded that plants can improve the quality of the air on the space station, removing common pollutants. NASA’s research focused on benzene, formaldehyde and trichloroethylene. Although the plants were the main subjects of the study, the potting soil, and microorganisms in the potting soil, also play a role in removing pollutants from the air.

 

Resource:http://perfectcube.wordpress.com/2009/02/06/grow-your-own-fresh-air-with-this-3-plants-solution/

3. Improve Indoor Environment with New Technology
 

The Benefit of Improve Indoor Environment:
IAQ impacts occupants’ comfort, health and performance

Reference:
Improve Indoor Environment with New Technology Andy Drysdale
Danish Technological Institute

4. Indoor Air Quality Curriculum Results in Real-Life Classroom Improvements
 

Poor indoor air quality can impact the comfort and health of students and staff, which, in turn, can affect student concentration, attendance and performance. In addition, if schools fail to respond promptly to poor IAQ, students and staff are at an increase risk of short-term health problems.

Reference:
Washington State University
Indoor Air Quality in Northwest Schools 
“The students learned that sometimes IAQ problems can be easy to fix. Sometimes it just takes making sure the HVAC system is on and working.”
Kaye Martin
Gateways Learning Center Springfield School District Oregon


5.

Recently issues on Indoor air quality in Korea

 

Now days, the air quality in the indoor environment has a significant impact on human health and comfort. Because most people spend most of their time in indoor, poor indoor air quality can lea d to discomfort, ill health, absenteeism, and low productivity. Good indoor air quality safeguards the health of indoor occupants and contributes to their comfort and well-being.

Reference:
Recently issues on Indoor air quality in Korea
Jee Yeon Jeong, PhD, P.E
Department of Occupational and Environment Health Yongin University

6. 二氧化碳是人類健康殺手
  最新研究表明二氧化碳是“人類健康殺手”
根據加州斯坦福大學一項電腦模型的研究成果,二氧化碳使氣溫每升高一攝氏度,全世界就將有約21,000人因此喪生。
這項即將發佈於《地球物理學研究雜誌》的報告還指出:在美國,因空氣污染引發的非癌症性疾病將導致1,000餘人喪生,另外還將有20-30起癌症引發的死亡。
斯坦福大學工程學教授馬克·雅各森(Mark Jacobson)稱,氣候變化對健康產生的影響將使重污染區域深受其害。雅各森作為該模型的開發者,參與了報告的撰寫。
他說:“基本上,由於二氧化碳引起的氣候變化,人們吸入了大量有害化學物質,兩者間的關聯是確定的。因此下一步要做的就是減少二氧化碳排放。”
二氧化碳使氣溫比地表溫度上升的更快。研究發現,污染物趨向於在原地停留,並且不易擴散。空氣中二氧化碳含量的增加還將導致臭氧含量上升。臭氧可引發呼吸及心血管類疾病。
雅各森稱:“二氧化碳是一種腐蝕性氣體,它可腐蝕橡膠和雕塑,還可使輪胎爆裂。可想而知,高濃度的二氧化碳將對人類的肺產生怎樣的傷害。”
為控制大氣中的二氧化碳,加州、紐約及其他一些州都採取了新的車輛排放法規。但是這一法規被聯邦環保局否決了,聯邦環保局認為,布希總統簽訂了一項新的能源法案,該法案通過新的車輛里程能耗標準減少溫室氣體排放。
加州的標準比布希議案更加嚴格。因此,最近加州以及其他一些州針對聯邦環保局的裁決提出了訴訟。
雅各森的研究增強了加州控制其空氣污染的決心和信心。雅各森稱:“美國10個污染最嚴重的城市中有6個都在加州,這讓我們所處的環境尤為特殊。”
雅各森開發的電腦模型用來研究大氣中污染物的增加與氣候變化帶來的影響。該模型研究的變數包括日照量、雨,風和雲的影響,以及大氣中污染物的形成、轉移及變化。
 

Reference:
http://www.861718.com
時間:2008-1-23 作者:admin