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The SI unit of irradiance is watts per square metre (W/m 2 = Wm −2). The unit of insolation often used in the solar power industry is kilowatt hours per square metre (kWh/m 2). [11] The langley is an alternative unit of insolation. One langley is one thermochemical calorie per square centimetre or 41,840 J/m 2. [12]
The solar constant includes radiation over the entire electromagnetic spectrum. It is measured by satellite as being 1.361 kilo watts per square meter (kW/m 2) at solar minimum (the time in the 11-year solar cycle when the number of sunspots is minimal) and approximately 0.1% greater (roughly 1.362 kW/m 2) at solar maximum. [1]
The Philippines utilizes renewable energy sources including hydropower, geothermal and solar energy, wind power and biomass resources. [citation needed] In 2013, these sources contributed 19,903 GWh of electrical energy, representing 26.44 percent of the country's electricity needs. [1]
Romania is located in an area with a good solar potential of 210 sunny days per year and with an annual solar energy flux between 1,000 kWh/m2/year and 1,300 kWh/m2/year. The most important solar regions of Romania are the Black Sea coast, Dobrogea and Oltenia.
Of the ~340 W/m 2 of solar radiation received by the Earth, an average of ~77 W/m 2 is reflected back to space by clouds and the atmosphere and ~23 W/m 2 is reflected by the surface albedo, leaving ~240 W/m 2 of solar energy input to the Earth's energy budget. This amount is called the absorbed solar radiation (ASR).
watt per square metre, per metre W/m 3: M⋅L −1 ⋅T −3: Radiant exposure: H e: joule per square metre J/m 2: M⋅T −2: Radiant energy received by a surface per unit area, or equivalently irradiance of a surface integrated over time of irradiation. This is sometimes also called "radiant fluence". Spectral exposure: H e,ν [nb 3] joule ...
Solar Energy. In 2015, three solar farms were constructed in the Philippines. The Philippines receives over 7kWh per square meter per day during its peak month of April and lowest at 3kWH per square meter per day during its off-peak month of December as observed by Schadow1 Expeditions in 33 cities of the country. [10]
The langley (Ly) is a unit of heat transmission, especially used to express the rate of solar radiation (or insolation) received by the earth. The unit was proposed by Franz Linke in 1942 [ 1 ] and named after Samuel Langley (1834–1906) in 1947.