Sayash Kapoor and (right) Vaibhav Agarwal at the science exhibition in Ranchi. Telegraph picture

Patna, Aug. 8: Two Delhi Public School, Patna, students have qualified for the national round of Central Board of Secondary Education (CBSE) Science Exhibition.

The topic of the exhibition is ‘Science, Society and Environment’. There are a total of six sub-themes — agriculture and food security, energy resources and conservation, health, environment issues and concerns, mathematics and everyday life and disaster management.

Sayash Kapoor and Vaibhav Agarwal, students of Class X and IX respectively, were chosen for the meet in October. They were selected from the regional-level competition held in Ranchi on August 6 and 7.

The two students would represent the state at the national-level exhibition to be held in September-October in Delhi and would compete with students from across the country. DPS, Patna, was the only school from the state capital to take part in the regional-level competition. Ten schools had participated from Jharkhand and Bihar.

Sayash, 15, told The Telegraph: “We tried to create a zero-energy city. First, we need to minimise the amount of energy we are using and then the rest can be produced from sunrays or wind. Three years back, I had made a model titled ‘Energy audit of the school building’ and the working project which we have made for the exhibition is an extension of that.”

He added: “The previous model dealt with improvement of energy efficiency of the school building, while this one is about how to create a zero energy city.” Explaining the concept, Sayash said: “A zero energy city is basically one that does not require any source of power and is completely self-sufficient. It does not depend on any source of energy except for renewable sources like solar energy. Three years back, when I made the project, it was on a small scale. So, I along with my friend Vaibhav decided to make it on a larger level through the CBSE Science Exhibition.”

Fourteen-year-old Vaibhav said: “Our project focussed on the conservation of energy and then producing the left-over energy by non-conventional sources. We have brought upon ancient Indian techniques. They were lost in history books. We used simple methods to replace refrigerators and air-conditioners.”

He added: “There were many projects from all fields of science. It was a learning experience and we got an opportunity to compete with students of 52 other groups.”