News tagged with greenhouse
A 'B12 shot' for marine algae? Scientists find key protein for algae growth in the ocean
Scientists have revealed a key cog in the biochemical machinery that allows marine algae at the base of the oceanic food chain to thrive. They have discovered a previously unknown protein in algae that grabs an essential ...
9 hours ago |
5 / 5 (2) |
3
|
Computer model used to pinpoint prime materials for efficient carbon capture
When power plants begin capturing their carbon emissions to reduce greenhouse gases – and to most in the electric power industry, it's a question of when, not if – it will be an expensive undertaking.
May 27, 2012 |
5 / 5 (1) |
2
|
Development of nonvolatile white light-emitting liquid that is coatable on diverse range of materials
A Japanese research team headed by Dr. Takashi Nakanishi of the National Institute for Materials Science developed a nonvolatile liquid material which emits white light at room temperature.
May 30, 2012 |
5 / 5 (4) |
0
Study takes novel 'back-casting' approach to transform cities for healthier lives
Researchers at four of the country's leading universities are embarking on a low carbon engineering project that could transform the way cities are built, as well as the way we live in them, by taking a novel 'back-casting' ...
May 29, 2012 |
5 / 5 (4) |
0
Recovering water from tailings ponds
(Phys.org) -- As Alberta faces increasing pressure to make the oil industry more sustainable, one University of Alberta researcher may have found a natural solution to a problem that has been plaguing oil companies for years.
May 29, 2012 |
5 / 5 (2) |
0
New CO2-removing catalyst can take the heat
(Phys.org) -- The current method of removing the greenhouse gas carbon dioxide (CO2) from the flues of coal-fired power plants uses so much energy that no one bothers to use it. So says Roger Aines, principal ...
May 24, 2012 |
5 / 5 (9) |
19
|
From lemons to lemonade: Reaction uses carbon dioxide to make carbon-based semiconductor
(Phys.org) -- A materials scientist at Michigan Technological University has discovered a chemical reaction that not only eats up the greenhouse gas carbon dioxide, it also creates something useful. And, by ...
May 21, 2012 |
4.7 / 5 (89) |
33
|
New research may improve the efficiency of the biofuel production cycle
(Phys.org) -- Using new experimental methods and computational analysis, a team of scientists from the Joint BioEnergy Institute (JBEI), led by Lawrence Livermore's Michael Thelen, discovered how certain bacteria ...
May 14, 2012 |
5 / 5 (4) |
6
|
Environmental group measures methane seeps in the Arctic
(Phys.org) -- A team of researchers, led by Katey Walter Anthony, of the University of Alaska, has been studying and mapping so-called seeps, holes in lake ice near the edges of glaciers where methane is bubbling ...
Space & Earth / Earth Sciences
May 21, 2012 |
5 / 5 (4) |
2
|
China hits back at claims it is blocking climate talks
China hit back Thursday at claims it was holding up global climate talks in Germany, saying the United States, Europe and other rich states were the ones applying the brakes.
May 24, 2012 |
not rated yet |
0
Research: Negative leakage could be key to reducing carbon emissions
(Phys.org) -- The unilateral efforts of a single country or region to reduce the emissions of greenhouse gases could reduce exports, increase imports and lead to higher emissions elsewhere – what economists call “leakage.” ...
May 25, 2012 |
5 / 5 (3) |
1
Solar thermal process produces cement with no carbon dioxide emissions
(Phys.org) -- While the largest contributor to anthropogenic greenhouse gas emissions is the power industry, the second largest is the more often overlooked cement industry, which accounts for 5-6% of all ...
Apr 10, 2012 |
4.6 / 5 (25) |
22
|
Black carbon, tropospheric ozone most likely driving Earth's tropical belt expansion
Black carbon aerosols and tropospheric ozone, both manmade pollutants emitted predominantly in the Northern Hemisphere's low- to mid-latitudes, are most likely pushing the boundary of the tropics further polew ...
Space & Earth / Earth Sciences
May 16, 2012 |
5 / 5 (5) |
7
|
Oxygen-separation membranes could aid in CO2 reduction
It may seem counterintuitive, but one way to reduce carbon dioxide emissions to the atmosphere may be to produce pure carbon dioxide in powerplants that burn fossil fuels. In this way, greenhouse gases — once isolated ...
May 15, 2012 |
5 / 5 (2) |
0
|
Americans support national clean-energy standard: study
The average U.S. citizen is willing to pay 13 percent more for electricity in support of a national clean-energy standard (NCES), according to Yale and Harvard researchers in Nature Climate Change.
Technology / Energy & Green Tech
May 13, 2012 |
3.2 / 5 (9) |
34
|
Greenhouse
A greenhouse (also called a glasshouse) is a building in which plants are grown. These structures range in size from small sheds to very large buildings. A miniature greenhouse is known as a cold frame.
A greenhouse is a structure with different types of covering materials, such as a glass or plastic roof and frequently glass or plastic walls; it heats up because incoming visible solar radiation (for which the glass is transparent) from the sun is absorbed by plants, soil, and other things inside the building. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall. In addition, the warmed structures and plants inside the greenhouse re-radiate some of their thermal energy in the infra-red, to which glass is partly opaque, so some of this energy is also trapped inside the glasshouse. However, this latter process is a minor player compared with the former (convective) process. Thus, the primary heating mechanism of a greenhouse is convection. This can be demonstrated by opening a small window near the roof of a greenhouse: the temperature drops considerably. This principle is the basis of the autovent automatic cooling system. Thus, the glass used for a greenhouse works as a barrier to air flow, and its effect is to trap energy within the greenhouse. The air that is warmed near the ground is prevented from rising indefinitely and flowing away.
Although there is some heat loss due to thermal conduction through the glass and other building materials, there is a net increase in energy (and therefore temperature) inside the greenhouse.
Greenhouses can be divided into glass greenhouses and plastic greenhouses. Plastics mostly used are PEfilm and multiwall sheet in PC or PMMA. Commercial glass greenhouses are often high tech production facilities for vegetables or flowers. The glass greenhouses are filled with equipment like screening installations, heating, cooling, lighting and may be automatically controlled by a computer.
For more information about Greenhouse, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
