Module 4 Unit 2 Quiz

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Question 1 of 12

1. Question
Which statement best describes the role of a building substation?
- A data‑collection unit that monitors temperatures and flows but does not interact with the thermal system.
- It transfers and controls thermal energy at the building boundary and may provide separation, protection, metering and communication functions.
- A backup heat source that activates when the district‑heating network cannot meet building demand.
- A device that increases network pressure so that heat can reach upper floors in multi‑storey buildings.
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Question 2 of 12

2. Question
What is the defining feature of an indirect building connection?
- District-network water flows directly through the building heating circuit.
- Defined by having a variable‑speed circulation pump on the district‑heating side to regulate flow into the building.
- Building uses its own boiler or heat pump to adjust the district‑heating temperature before distributing it indoors.
- A heat exchanger separates the district-network circuit from the building circuit.
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Question 3 of 12

3. Question
Which statement about a direct connection is correct?
- Network water enters all or part of the connected building heating circuit.
- The primary and secondary circuits are always separated by two plate heat exchangers.
- Building uses a heat exchanger with very low approach temperature so network water and building water behave almost identically.
- Building receives pre‑mixed supply and return water from the network to simplify temperature control.
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Question 4 of 12

4. Question
What is the main purpose of a differential-pressure controller?
- Ensures that the supply temperature remains constant regardless of changes in building demand.
- To increase pump efficiency by matching pump speed to the building’s instantaneous heat demand.
- To maintain a selected differential pressure across a defined part of the circuit.
- To guarantee the design ΔT under every operating condition.
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Question 5 of 12

5. Question
In a direct space-heating HIU with local instantaneous DHW preparation, which description is correct?
- Communal heating water never enters the dwelling; both space heating and DHW are prepared through separate plate heat exchangers inside the HIU.
- Communal heating water may flow through the dwelling heating circuit, while DHW is heated through a plate heat exchanger.
- Communal heating water is used only for DHW production, while the dwelling’s space‑heating circuit is always hydraulically separated by a heat exchanger.
- Communal heating water circulates through both the dwelling’s heating circuit and the DHW taps, providing hot water directly without any heat exchanger.
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Question 6 of 12

6. Question
Which dwelling arrangement commonly uses one heat exchanger for space-heating separation and a second heat exchanger for instantaneous DHW?
- A direct HIU with instantaneous DHW.
- A combi‑boiler replacement HIU.
- An indirect twin-plate HIU.
- A single‑plate HIU with DHW priority.
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Question 7 of 12

7. Question
Which set of elements is required for a thermal energy meter to determine transferred heat?
- Only a temperature sensor on the supply pipe, because modern algorithms can estimate return temperature and flow.
- A pressure sensor, a flow‑balancing valve and a network‑side temperature probe to determine transferred heat.
- A thermal meter works by measuring pump electricity consumption and correlating it with expected heat output from the circuit.
- Flow measurement, a matched supply/return temperature-sensor pair and a calculator/integrator.
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Question 8 of 12

8. Question
What does a heat meter installed at the building substation boundary normally measure?
- Heat delivered to the building or block across that measurement boundary.
- the building’s internal space‑heating consumption room by room.
- Electricity used by the district-heating pumps.
- Only domestic hot‑water energy because space‑heating flows are too variable to meter accurately at the boundary.
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Question 9 of 12

9. Question
A meter shows supply temperature 62°C, return temperature 58°C and flow 420 L/h. What are the approximate ΔT and heating power?
- ΔT = 120 K and power ≈ 2.0 kW.
- ΔT = 4 K and power ≈ 19.5 kW.
- ΔT = 4 K and power ≈ 2.0 kW.
- ΔT = 20 K and power ≈ 9.8 kW.
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Question 10 of 12

10. Question
During confirmed heating demand, the meter shows high flow and a small ΔT. What is the best interpretation?
- High flow with a small ΔT during heating demand always indicates excellent heat transfer and perfectly tuned control settings.
- It is a warning sign that may indicate excessive flow, bypass/keep-warm operation, poor heat extraction, control problems or a measurement error.
- The situation proves that the building has oversized emitters, so no further investigation of the heating system is necessary.
- It is irrelevant because ΔT does not affect network performance.
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Question 11 of 12

11. Question
Which action is appropriate during a routine site acceptance check of a billing heat meter?
- Recalibrate the certified meter on site.
- Verify the meter ID, flow direction, sensor locations, seals, units, communication and plausibility of readings.
- Check only the meter’s display to confirm that the energy value increases during flow, since internal wiring and sensors are factory‑calibrated and never require inspection.
- Reset the meter to factory settings to ensure all previous data is cleared before billing begins.
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Question 12 of 12

12. Question
The interface appears to provide heat, but the installed arrangement differs from the approved schematic and no commissioning record is available. What should happen?
- Accept the installation as long as heat is being delivered, because functional performance is more important than matching the approved schematic.
- Ignore the schematic and use the current meter reading as the only evidence.
- Record and escalate the discrepancy, request the required evidence and close defects before acceptance.
- Remove the heat meter to simplify the installation.
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