Self-test questions: Chapter 02

Self-test questions: Chapter 02

. Page 30 describes the three Laws of Thermodynamics. What does the Second Law say?

. Page 30 describes temperature scales. The size of a degree is the same in the Celsius and Kelvin scales but how is a Kelvin temperature expressed in degrees Celsius?

. The calorific value of a fuel may be given in terms of a higher or lower heating value. What does the higher heating value contain that is not included in the lower heating value?

. Using the data in Table 2.1 on page 32, how much carbon dioxide is released by burning one litre of petrol or gasoline?

. Pages 34 and 35, and Figure 2.2, describe the combustion process in a four stroke internal combustion engine. What happens on the induction stroke?

. Pages 36 to 38 describe the Carnot efficiency of a heat engine and the high efficiency Combined Cycle Gas Turbine (CCGT). If a CCGT has an input temperature of 1030°C and an exhaust temperature of 30°C, what is its maximum possible efficiency, its Carnot efficiency?

. Pages 40 and 41 describe the components of a heat pump and their functions. Which component emits the heat produced?

. Which chemical used as refrigerant has contributed significantly to both global warming and the ozone hole?

. The ability of a shallow ground source heat pump to draw heat from the ground depends on the soil conditions. Looking at the data in Table 2.4 on page 46, which type of soil has the highest specific heat extraction rate?

. In winter the district heating system of the Finnish city of Helsinki uses heat pumps. Where do they draw their heat from?

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