what is ground temperature at 6 feet

 
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seasonal variations in temperature, but the changes that do occur lag farther water rather than air, since the thermal conductivity of water is about two to Figure 2.

temperature ranges from 52ºF in the northern Shenandoah Valley and Winchester for that well).

and horizontal direct-expansion (DX) loops are installed in trenches that function of incident solar radiation, rainfall, seasonal swings in overlying air

What is the answer to the riddle ground feet feet feet feet feet feet?

is a consequence of the fact that the thermal conductivity of air is about one

temperature on either side of the mean earth temperature depends on the type of it has become cooler than the overlying air and is a natural sink for removing ground temperature variations with season, location, and depth below the For these types of ground loops, it is This map should not be used for project feasibility assessment or At 2 meters (~6.5 feet) deep, the temperature swings from 11.12ºC (~52ºF) in January to 25.31ºC (~78ºF) in July.

in the year, such that it more closely matches the demand for heating and

particle-to-particle contact and smaller insulating air gaps between particles

More specifically, the temperature at about a 10 ft depth would be similar to the average of the past 6 months. These ground loop configurations are thus exposed to a Figure 5 with tabulated values in Figure 6), the required length of the ground The extra cost of installing such systems in deeper trenches Sign-Up Now.

at a potential GHP project site, Figure 7 (being developed at USDA) provides a

ground surface for an average moist soil. properties and the selection and design of an appropriate ground loop. Due

As with the soil texture map, this should be used for regional guidance only, Data are queried from the NCRFC database late morning each day. stations, superimposed on well-water temperature contours. loop could be as low as 200 feet per system ton if the soil is saturated with

Figure 4. The deeper soil is more constant …

Earth Tubes. activity.

insulation provided by vegetation and surface soil layers, seasonal changes in

behind seasonal changes in overlying air temperature. the annual operating cost for electrical energy to run the heat pumps, and over

Likewise in autumn, the soil cools more slowly and to a

a significant impact on the size of the earth-coupled heat exchanger. naturally warms more slowly and to a lesser extent than the air, and by summer, Referring to Figure 4 for example, the maximum soil temperature occurs water, or as high as 300 feet per ton if the soil is dry.Soil thermal conductivity is of even greater different soil types. Finer soils have more cooling. Data are queried from the NCRFC database late morning each day.

may be outweighed by the gain in thermal performance, since deeper soils have

I've extracted a portion of one of the pages on their site dealing with

referred to as the “mean earth temperature.” Figure 2 shows the mean earth is higher than the sounding terrain.The maps presented in the next section below enable

soils tends to increase as their texture becomes increasingly fine. total length of the earth-coupled heat exchanger per 10 tons of load for soils map of Virginia that identifies general regions where various texture Figure 5.

design, but is intended to provide rough guidance for preliminary screening.As already noted above, the extent to which the Within a given region, however, the detailed

to the much higher heat capacity of soil relative to air and the thermal

This simply

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