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Heat Pumps for Heating and Cooling • The pressure rating of this pipe is determined by its diameter ratio (DR), which is the ratio of the outside diameter divided by the wall thickness. Common DRs for HDPE tubing are 7, 9, 11, 13.5, 15.5, and 17.5. • A diameter ratio (DR) of 11 or lower is suggested for buried portions of earth loops. DR-11 PE3608 piping has a pressure rating of 160 psi. The pressure ratings of DR-9 PE3608 tubing is 200 psi. Keep in mind that lower DRs imply greater wall thickness, and greater wall thickness creates greater thermal resistance across the pipe wall. The latter is undesirable from the standpoint of heat transfer. • All external pipework should be insulated and sleeved. When the GSHP is delivering heat, the ground loop circuit will normally be operating below the building interior’s dew point temperature. Good quality insulation and vapor sealing of internal pipework and fittings in this circuit is therefore essential to minimize condensation risks. The pipework should be configured to avoid damage if any condensation does occur. • Pipe diameters between 20mm and 40mm are usual for closed loop systems. The pipe diameter should preferably be large enough to keep the pumping power requirement small, yet small enough to cause turbulent flow to ensure good heat transfer. • Cross linked polyethylene tubing (a.k.a. PEX-A) can also be used for buried earth loops. In North America, the use of PEX tubing for earth loops is relatively new in comparison to non-cross linked PE3608 tubing. Being a thermoset polymer, PEX tubing cannot be joined by heat fusion (as with HDPE) and use mechanical couplings. The leakage is a potential concern. 3.9. Ground Loop Sizing A geothermal heat pump’s earth loop installation is not just a matter of burying some pipes and hooking these pipes to your geothermal heat pump. Your earth loop must be matched to the heat gain or heat loss of the building and the geothermal heat pump that it is coupled to. Step #1 First step in sizing an earth loop is having a correct heat loss/gain calculation done. This is important to know how many BTUHs the earth loop needs to supply to the geothermal heat pump, so it can heat the building correctly. This also tells us what the flow rate through your earth loop will have to be. 40PDF Image | Heat Pumps for Heating and Cooling
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