(e)
(f)
22.6
(a)
(b)
(c)
(d)
22.7
(a)
(b)
(c)
(d)
22.8
(a)
(b)
Mr Smith has read a newspaper article in which it was claimed that at the moment it is more expensive
to install a solar thermal system for water heating than to use the PV electricity to heat up the water
directly. He wants to assess whether this is true. The price of a PV panel is € 1/W p , the external costs
are € 400, and the efficiency of converting electricity to heat is assumed to be 85%. How much will it
cost to generate the same amount of energy with PV technology?
Assume that the lifetime of both systems is 20 years and the maintenance costs are equal for both cases.
Which will be the better choice for water heating?
Which one of the following methods cannot be used as a cooling method using solar thermal techniques?
Solar desiccant.
Heat pump.
Solar absorption.
Phase change materials (PCM).
What are the main advantages of a solar tower power plant? (More then one correct answer possible.)
Easy storage of energy.
High temperature fluid, which results in higher efficiencies.
Compact and modular.
Low investment costs.
The world electricity consumption is roughly 20,300 TWh per year. We want to cover the total electricity
demand of the world by installing solar thermal power in the Sahara desert, where the average daily solar
insolation is 6.3 kWh/m 2 . The Sahara has an area of 9,400,000 km 2 .
Assuming that the overall efficiency of a solar thermal power plant is 20%, how much area will be
needed to cover the world electricity demand?
What percentage of the area of the Sahara would be covered?
(f)
22.6
(a)
(b)
(c)
(d)
22.7
(a)
(b)
(c)
(d)
22.8
(a)
(b)
Mr Smith has read a newspaper article in which it was claimed that at the moment it is more expensive
to install a solar thermal system for water heating than to use the PV electricity to heat up the water
directly. He wants to assess whether this is true. The price of a PV panel is € 1/W p , the external costs
are € 400, and the efficiency of converting electricity to heat is assumed to be 85%. How much will it
cost to generate the same amount of energy with PV technology?
Assume that the lifetime of both systems is 20 years and the maintenance costs are equal for both cases.
Which will be the better choice for water heating?
Which one of the following methods cannot be used as a cooling method using solar thermal techniques?
Solar desiccant.
Heat pump.
Solar absorption.
Phase change materials (PCM).
What are the main advantages of a solar tower power plant? (More then one correct answer possible.)
Easy storage of energy.
High temperature fluid, which results in higher efficiencies.
Compact and modular.
Low investment costs.
The world electricity consumption is roughly 20,300 TWh per year. We want to cover the total electricity
demand of the world by installing solar thermal power in the Sahara desert, where the average daily solar
insolation is 6.3 kWh/m 2 . The Sahara has an area of 9,400,000 km 2 .
Assuming that the overall efficiency of a solar thermal power plant is 20%, how much area will be
needed to cover the world electricity demand?
What percentage of the area of the Sahara would be covered?