Correct Option: C

P-3,Q-5,R-1,S - 2
Solar chimney is a simple passive solar ventilation system which is known since antiquity.
Trombe walls are thermal storage walls, named after the French inventor Felix Trombe. A typical Trombe wall consists of a 20-40cm thick masonry wall painted a dark, heat-absorbing color and faced with a single or double layer of glass. The glass is placed between 2 - 15cm away from the masonry wall to create a small airspace. Heat from sunlight passing through the glass is absorbed by the dark surface, stored in the wall, and conducted slowly inward through the masonry.
Earth Air Tunnels
Although, this technique is essentially used for cooling the air in Hot and dry climates, it can also be used for winter heating. Earth- air tunnels may be considered as special types of wind towers connected to an underground tunnel. The cooling process is based on the fact that the temperature a few meters below the ground is almost constant throughout the year. A wind tower is connected to the underground tunnel, which runs from the bottom of the wind tower to the basement of the building. The wind tower catches the wind which is forced down the tower into the tunnel. The temperature of the tunnel, being lower than that of the ambient temperature, cools the air before it is circulated into the living space. In winter, the temperature of the air tunnel is higher than the ambient temperature and hence warms the air passing through it.
Radiant cooling systems typically use chilled water running in pipes in thermal contact with the surface. The circulating water only needs to b 2-4°C below the desired indoor air temperature.Heat is removed by the water flowing in the hydronic circuit once the heat from different sources in the space is absorbed by the actively cooled surface - ceiling, floor or walls.