* not completed

. How must the hot water storage tank of a thermosyphon solar water heater be sited in relation to the solar panels?

Below the solar panels correct incorrect

Above the solar panels correct incorrect

Level with the solar panels correct incorrect

* not completed

. Why does the UK receive more solar radiation in summer than in winter?

The brightness of the Sun varies over the year correct incorrect

The Earth is closer to the Sun in summer than in winter correct incorrect

The Earth rotates around the Sun with its axis tilted to the plane of rotation correct incorrect

* not completed

. Heat is lost through double glazed windows by three mechanisms: conduction, convection and radiation. Which one can be reduced by the use of low emissivity coatings?

Radiation correct incorrect

Convection correct incorrect

Conduction correct incorrect

* not completed

. The most common type of passive solar heating is Direct Gain. How does this absorb solar energy?

Using rooftop solar panels correct incorrect

With a greenhouse or conservatory correct incorrect

By absorbing sunlight through windows correct incorrect

* not completed

. Unglazed solar panels are most commonly used for which application?

Swimming pool heating correct incorrect

Heating domestic hot water correct incorrect

Crop drying correct incorrect

* not completed

. Passivhaus design is a form of low energy house construction. Why is it described as being 'passive'?

It is very easy to build correct incorrect

It has very big windows correct incorrect

It does not require a conventional large heating system correct incorrect

* not completed

. Figure 3.36 on page 91 shows a sun path diagram for latitude of 56°N. It is June 21st. Roughly for how many hours will the sun's altitude be greater than 20°?

12 hours correct incorrect

10 hours correct incorrect

8 hours correct incorrect

* not completed

. Concentrating solar power (CSP) plants go to considerable lengths to produce high operating temperatures with mirrors. Why not use cheaper flat plate collectors and lower temperatures?

Mirrors are cheaper than flat plate collectors correct incorrect

High temperatures give a high Carnot efficiency correct incorrect

Mirrors last longer than flat plate collectors correct incorrect

* not completed

. What technology is being used with concentrating solar power plants to allow them to produce steam (and electricity) day and night?

Hot water tanks correct incorrect

Batteries correct incorrect

Molten salt thermal energy storage correct incorrect

* not completed

. In 2014 what proportion of the world's installed capacity of solar thermal collectors was in China?

over 70% correct incorrect

about 50% correct incorrect

about 30% correct incorrect