Solar panels keep buildings cool

Those solar panels on top of your roof aren’t just providing clean power; they are cooling your house, or your workplace, too, according to a team of researchers led by Jan Kleissl, a professor of environmental engineering at the UC San Diego Jacobs School of Engineering.

In a study in an upcoming issue of the journal Solar Energy, Kleissl and his team published what they believe are the first peer-reviewed measurements of the cooling benefits provided by solar photovoltaic panels. Using thermal imaging, researchers determined that during the day, a building’s ceiling was 5 degrees Fahrenheit cooler under solar panels than under an exposed roof. At night, the panels help hold heat in, reducing heating costs in the winter.

(more…)

Share

A typical solar thermal installation by Thermax Limited.

The Indian Minister of New & Renewable Energy, Dr. Farooq Abdullah, on July 1st, 2011 inaugurated a solar thermal cooling system at the Solar Energy Centre in Gurgaon in Haryana. Minister of Power, Shri Sushilkumar Shinde, was also present at inauguration of the solar cooling system for which India claims the world’s highest efficiency.


A typical solar thermal installation by Thermax Limited.

Triple effect absorption cooling technology

The new 100 kw Solar Air-Conditioning System due to the ministers works at 30% higher efficiency than the current available systems and has several unique features. It is based on the new triple effect absorption cooling technology. The system has indigenously built medium temperature high efficiency parabolic troughs for collection of solar energy and effective solar thermal energy storage in the form of Phase Change Materials.

 

Vapor absorption machine generates 7 °C chilled water

The present system will cater to air-conditioning needs of 13 rooms of Solar Energy Centre. To achieve this, 288 square meters of Solar Collector area has been installed which generates nearly 60 kW of
210 °C pressurized hot water. This heat is used in a vapor absorption machine to generate 7 °C chilled water which in turn circulates through the fan coil unit installed in the thirteen rooms. The major attraction of this system is that the hottest days have the greatest need for cooling and simultaneously, offer the maximum possible solar energy gain.
The system has been developed in joint collaboration by Solar Energy Centre with M/s Thermax Limited, Pune and is expected to meet the growing demand for air-conditioning in India in a highly efficient and cost effective way through use of direct solar energy.

Source: solarserver

 

Share