A 4-ton heat pump is installed. Desired flow rate is 12 USgpm. The runner and header from the Mechanical room is 110 feet in delivery and 110 feet in return. The fluid running in the system is Methanol-20%. The ground loop consists of three parallel vertical loops each 290 feet in length. The ground loop is made of 0.75" HDPE SDR 11 pipes and the runner-header is made of 1.25" HDPE SDR 11 pipes. The heatpump pressure drop is given 5.8 ft of wc for a flow of 6 gpm of water (Correction factor 20% Propylene Glycol:1.36, 20% Methanol: 1.25, 25% Ethanol: 1.32). Q: Calculate the pressure drop in the Runner-Header.
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A 4-ton heat pump is installed. Desired flow rate is 12 USgpm. The runner and header from the
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