FEASIBILITY AND PERFORMANCE CURVES FOR INTERMITTENT EARTH TUBE HEAT EXCHANGERS.

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Abstract

A time dependent axisymmetric finite element formulation was used to evaluate the thermal performance characteristics of an intermittent earth tube system. The parameters examined were: pipe diameter, pipe length, initial soil moisture concentration and temperature, and ambient air temperature. Performance curves for both heating and cooling modes were obtained. The soil temperature regeneration characteristics for intermittent operation indicated complete recovery in the heating mode and only a partial recovery in the cooling mode. Soil moisture in the 20% to 30% range had little effect on heat exchanger performance.

Original languageEnglish (US)
Pages (from-to)526-532
Number of pages7
JournalTransactions of the American Society of Agricultural Engineers
Volume29
Issue number2
StatePublished - Mar 1986

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heat exchangers
Tubes (components)
Soil
pipe
Hot Temperature
soil moisture
Earth (planet)
Soil moisture
heating
cooling
pipes
heat
Heating
Temperature
Pipe
soil water
ambient air
soil temperature
Cooling
Recovery

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)

Cite this

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abstract = "A time dependent axisymmetric finite element formulation was used to evaluate the thermal performance characteristics of an intermittent earth tube system. The parameters examined were: pipe diameter, pipe length, initial soil moisture concentration and temperature, and ambient air temperature. Performance curves for both heating and cooling modes were obtained. The soil temperature regeneration characteristics for intermittent operation indicated complete recovery in the heating mode and only a partial recovery in the cooling mode. Soil moisture in the 20{\%} to 30{\%} range had little effect on heat exchanger performance.",
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