6 questions Intermediate

ECADEMY test

5 - High efficiency hydronic systems

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Correct
Q: The indoor climate in a building with hydronic cooling is better than in a building with a forced air system. Why?
A: Because the use of hydronic systems for removing sensible heat loads means that less air is needed, which results in lower air velocities, less draft, and less noise.
Correct
Q: What effect does the introduction of radiant cooling systems have on the chilled water production?
A: With radiant cooling systems it is increasingly feasible to utilise sustainable chilled water sources for free cooling because the chilled water temperature is up to approx. 8 - 10 °C higher than with traditional systems.
Correct
Q: Why is a mixing loop the best way to control a radiant system?
A: Because flow rate and temperature can be adjusted according to the desired performance of the radiant surface
Correct
Q: The heat energy distribution costs of hydronic systems are about 1/10 of the cost of a forced air system. How come?
A: Because forced air systems need much more air volumes to transport the same amount of energy than is the case with water.
Correct
Q: When is zoning an advantage?
A: When a building has different requirements to temperature or when the internal load from occupants is different.
Correct
Q: How does radiant cooling in a room work?
A: A radiant ceiling or floor is a low temperature surface, which receives more heat radiation than it emits and thereby removes sensible heat loads. A radiant ceiling also absorbs heat by convection.