6 questions Intermediate


5 - High efficiency hydronic systems

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Q: When is zoning an advantage?
A: When a building has different requirements to temperature or when the internal load from occupants is different.
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.
Q: What influence does the introduction of radiant cooling systems have on other building services?
A: Air volumes, air handlers and air ducts can be reduced in size because radiant cooling systems take care of the sensible heat loads and a dedicated outdoor air systems can be introduced (DOAS).
Q: What is the difference between sensible cooling and latent cooling?
A: Sensible cooling involves reduction in temperature while latent cooling involves removal of humidity from the air
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.
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