In recent years, the power needed to heat or cool buildings has fallen dramatically with the focus on reducing energy consumption and minimizing the environmental impact of HVAC installations. The flow rates in our installations are much lower now than in the past, especially if we use modulating controls on the terminal units. Here, IMI Hydronic Engineering explains the issues around low flow rates in boilers, cooling units, and pumps; solutions to guarantee the minimum flow rate; and effective ways to control low flow rates.
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