Title: Heat generation quiz

Working principle gas boilers

- Fuel
- Air
- Condensate
- Exhaust gas
- Primary heat exchanger
- Secondary heat exchanger
Q: Exhaut gas
A: Exhaust gas
Q: 1. heat exchanger
A: Primary heat exchanger
Q: 2. heat exchanger
A: Secondary heat exchanger
Q: Fuel
A: Fuel
Q: Air
A: Air
Q: Condensate
A: Condensate

Boilers

On the right, the working principle of a gas boiler is shown. Drag the text fields to the correct positions in the figure.

Image source: User:Kino, CC-by-sa 2.0/de, https://de.wikipedia.org/w/index.php?curid=2798707

Drag and drop - heat pump

- [Image: Compressor]
- [Image: Condenser]
- [Image: Evaporator]
- [Image: Valve]
- [Image: Q_condenser]
- [Image: Q_evaporator]
- [Image: P_el]
Q: Compressor
A: [Image: Compressor]
Q: Evaporator
A: [Image: Evaporator]; [Image: Condenser]
Q: Condenser
A: [Image: Condenser]; [Image: Evaporator]
Q: Valve
A: [Image: Valve]
Q: P_el
A: [Image: Q_condenser]; [Image: P_el]
Q: Q_C
A: [Image: Q_condenser]
Q: Q_E
A: [Image: Q_evaporator]
Q: nothing

Heat pumps

What are the different components of a heat pump? Name them first and then complete the schematic on the right.

1. Compressor

Q: 2. [...]

3. [...]

4. [...]
A: Condenser/condenser; Valve/valve/expansion valve/Expansion valve; Evaporator/evaporator

Heat pumps - Questions

Q: What is the effect of the temperature difference between the heat source and the heating system?
- The higher the source temperature and the lower the flow temperature in the heating system, the higher the performance factor. (correct)
- The lower the source temperature and the higher the flow temperature in the heating system, the higher the performance factor.
- Geothermal heat pumps have the advantage that the ground has a relatively constant temperature throughout the year. (correct)
- The flow temperature of the heating system has no influence on the performance factor of the heat pump.

Heat pumps - Questions

Q: A single-family home has a heating load of 8975W, which is provided by a heat pump. Calculate the COP if the electrical power required by the heat pump is 2.2 kW. Enter your computation rounded off to the second decimal point.   [...]
A: 4.08/4,08

Q: What is the difference between the COP and the seasonal performance factor (SPF)?
- Unlike the COP, the SPF is related to energy quantities, not power. (correct)
- Unlike the COP, the SPF is the ratio of the condenser heat flow to the evaporator heat flow.
- The SPF is the inverse of the COP.

District heating - Questions

Q: What are typical sources for district heating?
- waste incineration plants (correct)
- wood chip furnace (correct)
- sewage treatment plants (correct)
- industrial sites with low-temperature processes
- large lakes (correct)

Industrial heat generation

Working principle gas boilers

- Material outlet
- Material inlet
- Fuel and air
- Combustion
Q: Material inlet
A: Material inlet
Q: Fuel and air
A: Fuel and air
Q: Combustion
A: Combustion
Q: Material outlet
A: Material outlet

Industrial heat generation

On the right, the working principle of a rotary kiln is shown. Rotary kilns are used in the cement production. After the raw materials are prepared and crushed, the raw meal is burned at around 1450 °C in a rotary kiln to produce cement clinker.

Drag the text fields to the correct positions in the figure.

Image source: https://www.sciencedirect.com/science/article/pii/S0196890416300413