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Heat Pumps for Heating and Cooling 3.13. Installation Costs Installation costs vary according to site conditions, ground structure, size of heat exchanger and appointed contractor. As a rule of thumb, the following unit rates are suitable for preliminary costing purposes. Drilling, piping and grouting for vertical bore holes is in the order of $22–$25 per vertical meter. Allow $80–$90 per bore hole for the horizontal header pipework and $50–$65 per meter of pipe for the horizontal trenching from the building line to the ground heat exchanger field. 3.14. Commissioning In the commissioning process, the function of all components should be checked and confirmed as fully operational. The ground loop, if correctly designed and constructed, will not require flow balancing. The fitting of balancing valves and other similar devices should only be installed where they are necessary because of the type of system being installed, as dictated by site and installed equipment characteristics or constraints. The system owner should be instructed in the use and maintenance of the system and who to contact for post-installation support and advice. The location of all buried pipes should be recorded and mapped in order to prevent future works disrupting or damaging the ground loop. 3.15. Decommissioning A standard ground loop installation is expected to have an operational life of over 50 years and potentially more than 100 years. In the event that a particular system is being retired from active use, it is important that the system is appropriately decommissioned. An unused and un-drained ground loop will eventually deteriorate and could leak antifreeze, or in the case of a DX system, refrigerant. There is also potential for future construction works to rupture an inactive loop if records of the location of the loops are not available. Leakage poses a potential threat to the environment, especially to groundwater resources. All fluid in the ground loop should be displaced, removed and appropriately disposed of at the end of active service. For vertical loops, following removal of the working fluid, a hole should be excavated at least 1.5m below the ground surface around the pipe, and this section of pipe 46PDF Image | Heat Pumps for Heating and Cooling
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