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Heat Pumps for Heating and Cooling allow air-venting devices in systems containing propylene glycol to discharge directly into mechanical rooms. 3.11. Suitability of Site Site suitability is a function of many variables and extends to include: • Thermal conductivity (ability to diffuse heat) of the soil and rock. • Allowable area of field (existing/future structures) including space for future capacity. • Drilling conditions (slope of site, trees). • Species of flora with aggressive root systems should be removed from the proposed site. • Quantity and diversity of heat to be rejected to the field. When considering suitability of the site, all underground and above ground services, both present and future, need to be taken into account. An allowance should be made at the plant room header for connecting a cooling tower at a later date, should extra capacity be required and where an additional field loop is unable to be laid. The number and depth of bore holes required will depend on the type of soil or rock and their formations below the proposed site, as well as the peak heat capacity to be rejected. A checklist for what should be performed in the geotechnical survey includes: • A check to determine if underground aquifers exist and to what depth standing water will rise • Any fault lines or unusual geological formations should be noted along with any reasons why drilling on the proposed site may be inadvisable. Any other unsuitable conditions which may affect drilling or installing the proposed field should be highlighted • Local ground stability, over time • Advice as to what depth conventional trenching equipment can reach without requiring blasting (the trench for header pipes should preferably be dug without blasting) • The potential variability of the geological conditions over the entire proposed field should be noted and the advisability or necessity of drilling further test holes to gain a more reliable estimate, should be stated. Site gradient, soil surface conditions and weight bearing capacity (to determine site suitability for supporting drilling machinery) should be considered. 44PDF Image | Heat Pumps for Heating and Cooling
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