Franz Schreier at 17:00, 28 December 2014

2014-12-28T17:00:19Z

Axel Heinemann: 1 revision

2014-11-08T16:51:29Z

1 revision

Benjamin Rebenich at 07:50, 24 October 2014

2014-10-24T07:50:57Z

New page

{{Powering Agriculture Technology Database
|PAT quality check=Yes
|PAT Name=Night Radiative Cooling
|PAT Type RE=Renewable Energy
|PAT Type Alternative=Alternative Methodology
|PAT Description=All objects constantly emit and absorb radiant energy. At night, the long-wave radiation from the clear sky is less than the long-wave infrared radiation emitted from a building, thus there is a net flow to the sky. Since the roof provides the greatest surface visible to the night sky, designing the roof to act as a radiator is an effective strategy.

There are two types of radiative cooling strategies that utilize the roof surface: direct and indirect.

Direct radiant cooling - In a building designed to optimize direct radiation cooling, the building roof acts as a heat sink to absorb the daily internal loads. The roof acts as the best heat sink because it is the greatest surface exposed to the night sky. Radiate heat transfer with the night sky will remove heat from the building roof, thus cooling the building structure. Roof ponds are an example of this strategy. The roof pond design became popular with the development of the Sky thermal system designed by Harold Hay in 1977. There are various designs and configurations for the roof pond system but the concept is the same for all designs. The roof uses water, either plastic bags filled with water or an open pond, as the heat sink while a system of movable insulation panels regulate the mode of heating or cooling. During daytime in the summer, the water on the roof is protected from the solar radiation and ambient air temperature by movable insulation, which allows it to serve as a heat sink and absorb, though the ceiling, the heat generated inside. At night, the panels are retracted to allow nocturnal radiation between the roof pond and the night sky, thus removing the stored heat from the day’s internal loads. In winter, the process is reversed so that the roof pond is allowed to absorb solar radiation during the day and release it during the night into the space below.

Indirect radiant cooling - A heat transfer fluid removes heat from the building structure through radiate heat transfer with the night sky. A common design for this strategy involves a plenum between the building roof and the radiator surface. Air is drawn into the building through the plenum, cooled from the radiator, and cools the mass of the building structure. During the day, the building mass acts as a heat sink.

(Source:http://en.wikipedia.org/wiki/Passive_cooling#Radiative_cooling)
|PAT Technology Application Other=Natural Cooling
|PAT Value Processing=Processing
|PAT Actions Drying=Drying
|PAT Actions Cooling=Cooling
|PAT Actions Venting=Venting
|PAT Commodity Other=All commodity groups with cooling requirements
|PAT Dev Region Worldwide=None
|PAT Dev Region South Asia=
|PAT Dev Country South Asia=
|PAT Dev Region Africa=
|PAT Dev Country Africa=
|PAT Dev Region East Asia=
|PAT Dev Country East Asia=
|PAT Dev Region Europe=
|PAT Dev Country Europe=
|PAT Dev Region Latin America=
|PAT Dev Country Latin America=
|PAT Dev Region Middle East=
|PAT Dev Country Middle East=
|PAT Dev Region North America=
|PAT Dev Country North America=
|PAT Dep Region Worldwide=Worldwide
|PAT Dep Region South Asia=
|PAT Dep Country South Asia=
|PAT Dep Region Africa=
|PAT Dep Country Africa=
|PAT Dep Region East Asia=
|PAT Dep Country East Asia=
|PAT Dep Region Europe=
|PAT Dep Country Europe=
|PAT Dep Region Latin America=
|PAT Dep Country Latin America=
|PAT Dep Region Middle East=
|PAT Dep Country Middle East=
|PAT Dep Region North America=
|PAT Dep Country North America=
|PAT Dep Pot Region Worldwide=Worldwide
|PAT Dep Pot Region South Asia=
|PAT Dep Pot Country South Asia=
|PAT Dep Pot Region Africa=
|PAT Dep Pot Country Africa=
|PAT Dep Pot Region East Asia=
|PAT Dep Pot Country East Asia=
|PAT Dep Pot Region Europe=
|PAT Dep Pot Country Europe=
|PAT Dep Pot Region Latin America=
|PAT Dep Pot Country Latin America=
|PAT Dep Pot Region Middle East=
|PAT Dep Pot Country Middle East=
|PAT Dep Pot Region North America=
|PAT Dep Pot Country North America=
|PAT Manufacturers=Different activities and basic technologies, see links below;
|PAT Economics=Uses natural cooling potentials, in some cases only a few electricity (for small pumps) and no fuels necessary;
|PAT Technology Development Level=Research and development and first pilot installations;
|PAT Maintenance=Basic: Technology can be maintained through its life cycle with common tools and a universally understood maintenance manual;
|PAT Infrastructure=Low: Technology can be developed with less common tools, low development level supporting technologies and moderately trained personnel;
|PAT Required Resources Manufacture=Metal, plastics, glass, films, depending on type and developed production facility
|PAT Required Resources Operation=In some cases electricity;
|PAT Deployment Level=Research and development and Prototype testing;
|PAT Deployment Capability=High: The technology can be widely deployed limited only by education
|PAT Requirements for Deployment=Independent: Fully autonomous and self-supportingelectricity supply
|PAT Relevance Autonomy=Independent: Fully autonomous and self-supporting;
|PAT Environment Impacts=Low: no direct emissions but indirect emissions;
|PAT Bio-Cybernetic=high
|PAT Links=http://en.wikipedia.org/wiki/Passive_cooling#Radiative_cooling

http://en.wikipedia.org/wiki/Radiative_cooling

http://www.asterism.org/tutorials/tut37%20Radiative%20Cooling.pdf

http://www.youtube.com/watch?v=544jTj0gpqY

http://cedarmountainsolar.com/nightskyradiantcooling.php?PageID=5_TrueID%3D5

http://solarwall.com/en/products/nightsolar-air-cooling.php

http://www.builditsolar.com/Experimental/RadiationCool/EvaproRad.htm

http://www.understandingnano.com/nanophotonic-radiative-cooling.html

http://misfitsarchitecture.com/2013/03/01/its-not-rocket-science-5-night-sky-radiant-cooling/

http://storage5.net/r/radiative-cooling-pdf.pdf

http://www.nhbs.com/title/view/175686
|PAT Category=Cooling
|PAT Pumping=
|PAT Ventilation=
|PAT Lighting=
|PAT Heating=
|PAT Cooling=Free Cooling
|PAT Food Conservation=
|PAT Power Sources=
|PAT Wind=
|PAT Hydro Power=
|PAT Humans and Animals=
|PAT Soil Amendments=
|PAT Growing Environment=
|PAT Combustion Dryers=
|PAT Water Powered Pumps=
|PAT Heat Powered Pumps=
|PAT Motorized Pumps=
|PAT Forced Ventilation=
|PAT Room Lighting=
|PAT Fossil Fuel Based Heating Systems=
|PAT Solar Based Heating Systems=
|PAT Storage Systems=
|PAT Cooling Equipment=
|PAT Solar Cooling=
|PAT Solar Dryers=
|PAT Food Conservation Others=
|PAT Drip Irrigation=
|PAT Mobile Power Units=
|PAT Solar Thermal=
|PAT Solar Mobility Vehicles=
|PAT Solar Energy Others=
|PAT Small Wind Turbines=
|PAT Biomass=
|PAT Biofuel=
|PAT Biogas=
|PAT Micro Hydro=
|PAT Humans=
|PAT Animals=
|PAT Soil Cultures=
|PAT Cultivation Systems Others=
|PAT Biochar=
|PAT Composte=
|PAT Insects=
|PAT Plants=
|PAT Others=
|PAT Small and Mid Size Greenhouses=
|PAT Implements=
|PAT Value Storage=Storage
|PAT Commodity Fruits=Fruits
|PAT Commodity Berries=Berries
|PAT Commodity Animal Products=Animal Products
|PAT Commodity Vegetables=Vegetables
}}

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 {{Powering Agriculture Technology Database
 |PAT Name=Night Radiative Cooling
 |PAT Type RE=Renewable Energy
 |PAT Type Alternative=Alternative Methodology
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 |PAT Dev Region North America=
 |PAT Dev Country North America=
 |PAT Dep Region Worldwide=Worldwide
 |PAT Dep Region South Asia=
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 |PAT Dep Region North America=
 |PAT Dep Country North America=
 |PAT Dep Pot Region Worldwide=Worldwide
 |PAT Dep Pot Region South Asia=
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 |PAT Dep Pot Region North America=
 |PAT Dep Pot Country North America=
 |PAT Manufacturers=Different activities and basic technologies, see links below;
 |PAT Economics=Uses natural cooling potentials, in some cases only a few electricity (for small pumps) and no fuels necessary;
@@ Line 98: / Line 101: @@
 http://www.nhbs.com/title/view/175686
 |PAT Category=Cooling
 |PAT Pumping=

← Older revision	Revision as of 16:51, 8 November 2014
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Night Radiative Cooling (PA Technology) - Revision history

Franz Schreier at 17:00, 28 December 2014

Axel Heinemann: 1 revision

Benjamin Rebenich at 07:50, 24 October 2014