CPD PROGRAMME Module 40 May 2012
1. What normal daily irradiance could be expected in April in Belfast?
A 1 kWh·m-2 B 2 kWh·m-2 C 3 kWh·m-2 D 4 kWh·m-2 E 5 kWh·m-2
2. Which of these is likely to be true of solar thermal systems?
A They last less than 20 years but pay back financially in that time
B They have a lifetime expectancy of more than 20 years and will provide a carbon payback of less than that time
C They have a lifetime expectancy of more than 20 years but will not provide a carbon payback although, without subsidy, will pay back financially
D They last more than 20 years but are only carbon beneficial when replacing electric hot water heating
E Some academic studies of solar thermal may use over- optimistic data and, as a result, the carbon payback is a fallacy
3. What is the maximum size of commercial ground-mounted solar collector allowable under PDRs in England?
A 1m2 B 3m2 C 5m2 D 7m2 E 9m2
4. In the EST survey of existing solar thermal installations, what simple energy saving measure was specifically seen as lacking in many systems?
A DTC control B Poor-quality collectors C Adequate insulation around pipework D Cleanliness of panel surfaces E Appropriate storage
5. For a collector with characteristics η0 the surrounding air is 25C?
A 10% B 30% C 50% D 70% E 90%
58 CIBSE Journal May 2012
0.0135, what is its likely efficiency when the solar irradiance on the panel is 500 W·m-2
= 0.779, a1 = 1.07 and a2 = when the mean collector temperature is 95C and
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