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Ground Temperature Model
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This component models the temperature of the earth as a function of depth and time of year. The model is based on the Kusuda correlation and is used
in geothermal heat pump applications and basement loss calculations.
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Simple Buried Pipe
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This component models a horizontal pipe that is buried in the earth. This simple approach (based on the standard TRNSYS type 31 plug-flow approach)
requires the user to provide the heat transfer coefficient from the fluid to the ground and the ground temperature (usually provided by the new
ground temperature model). Heat storage in the ground is not considered.
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Detailed Buried Pipe (Horizontal Ground Heat Exchanger)
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This component models a horizontal pipe (or horizontal ground heat exchanger) that is buried in the earth. This model relies on a finite-difference
approach to solve the temperature distribution in the pipe and soil and is based on a method developed by Oak Ridge National Laboratories. Heat
storage in the ground is considered, but heat exchange between several buried pipes is not considered.
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Tube-in-Tube Vertical Ground Heat Exchanger
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This component represents the finest vertical ground heat exchanger model in the world today! Written by the University of Lund, Sweden, this
component has been extensively tested and updated over the past several years and is available for the very first time in TRNSYS format. The model
includes both tube-in-tube and U-tube vertical ground heat exchangers (both single and multiple). The models relies on both analytical and
finite-difference methods to model the complex heat transfer between the working fluid and the earth in which the heat exchanger is buried. This is
the only ground heat exchanger model that we'll use - its simply the best there is.
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U-Tube Vertical Ground Heat Exchanger
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This component represents the finest vertical ground heat exchanger model in the world today! Written by the University of Lund, Sweden, this
component has been extensively tested and updated over the past several years and is available for the very first time in TRNSYS format. The model
includes both tube-in-tube and U-tube vertical ground heat exchangers (both single and multiple). The models relies on both analytical and
finite-difference methods to model the complex heat transfer between the working fluid and the earth in which the heat exchanger is buried.
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Geothermal Heat Pump
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This new component models the performance of a water-source heat pump (water to refrigerant to air heat transfer). The component uses a look-up table
approach to calculate the cooling and heating capacities and power based on tables of manufacturer's data. Two sample data files are included with
purchase (1 heating and 1 cooling). Data files for other manufacturer's/models may be created quickly and easily by the user and incorporated into
the simulations. This model includes a desuperheater option for the heating of a domestic hot water stream.
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