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Icon
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Name
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Type Number
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Description
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Cost
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Source Code
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DLL
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Proformas
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Technical Doc
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Example
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Sample Catalog Data
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Dry Fluid Cooler
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511
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This component models a dry fluid cooler; a device used to cool a liquid stream by blowing cool air across the
coils. The user provides the performance at design conditions (easily found on the internet) and the model
calculates the off-design performance. The manual for this model includes a detailed engineering description
of how the off-design performance is calculated.
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$US 150
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Solar Collector
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539
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We’re really excited about this new solar collector and hope that it will replace the Type 1 collector in standard
TRNSYS. The models takes the results from a collector efficiency test and calculates the collector loss coefficient
and the transmittance-absorptance product at normal incidence by first solving for the collector heat removal factor
(FR). The collector is divided into a series of isothermal temperatures nodes and the model accounts for the
capacitance of the collector and fluid! This eliminates many of the annoying controller oscillations that plague
simulations using the Type 1 collector. The model allows the user to connect collectors in series without having to
string them together in the studio. The model also allows the user to control the flow rate through the collector in
order to maintain the outlet temperature at a user-defined set point.
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$US 200
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Noded Pipe
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604
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Unlike the standard Type 31 pipe model in TRNSYS, this component considers the impact of the pipe mass, and insulation
mass. The model calculates the heat loss coefficient based on the fluid properties, the pipe properties, the
insulation properties, and convection (forced and natural) and radiation from the outer surface to the environment.
The model assumes that the pipe can be characterized by a series of inter-connected, fully-mixed, fluid nodes (mimics
plug-flow when the number of nodes is high). Unlike any other pipe model that we know of in TRNSYS, this model
allows you to flow fluid through either direction in the pipe (just not both directions in the same time step).
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$US 150
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Air Duct
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607
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Long missing from the standard TRNSYS library, this component allows the user to estimate the heat losses/gains by an
air stream as it moves through a duct (circular or non-circular ducts can be modeled). The model assumes that the duct
can be characterized by a series of inter-connected, fully-mixed, air nodes. Pressure drop effects are not
calculated. The duct may be insulated and both forced convection and free convection (natural convection) effects are
considered.
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$US 100
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Horizontal Ground Heat Exchanger
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916
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This component models the heat transfer to/from the ground from a series of horizontal pipes buried in the earth.
The pipes may be configured in any conceivable flow configuration including all in parallel, serpentine,
double-serpentine, intertwined quadruple serpentine, etc. Insulation may be placed on the soil surface and also down
the edges of the pipe system. Pipe-to-pipe interaction is considered. The pipes are surrounded by a fully 3-D
rectangular conduction model of the ground that includes the impact of energy storage in the ground.
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$US 200
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Slab on Grade
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934
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This component interacts with zone models to calculate the heat transfer from the zone to the soil through an
insulated (or not) slab. The soil beneath the slab is a fully 3-D rectangular soil conduction model. Near and far
field considerations are taken into account. The bottom of the slab and the edges of the footing may be insulated.
A portion of the upper slab surface may also be covered with an insulating material (carpet etc.). This model is
based on the TESS slab model approach which has been recognized as a research standard by IEA task 34/43 and
validated against a detailed analytical solution. You may also be interested in a version of this program that
interacts with the detailed multi-zone building model in TRNSYS (Type 56).
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$US 250
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Heat Pump Water Heater
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938
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A heat pump water heats an entering liquid stream by removing energy from an air stream passing across the evaporator
coil of the device. In this model, the performance of the device is read from normalized external data files as a
function of the entering liquid temperature, entering air temperature and entering air relative humidity. The model
calculates all of the component energy flows (evaporator, condenser, compressor, blower) in the device and reports
them each time step.
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$US 100
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Tankless Water Heater
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940
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This component models a tankless water heater; a device used to heat a liquid stream by the addition of heat from
either an electric heating element or a gas combustion heating source. In simple terms it is an auxiliary heater with
internal controls to modulate the heat input to the fluid. One of the important features of tankless water heaters
is their quick response to changing conditions. To study systems with quick response, small timesteps are typically
used in TRNSYS. However, small timesteps substantially increase the simulation speed and running at timesteps
approaching one second may not be feasible for annual simulations. Unfortunately large timesteps (15 minutes or
greater) may cause severe over or under-heating of the fluid, as control decisions are then only made once each
timestep. To alleviate this problem, the model utilizes an internal control methodology that allows multiple control
decisions to be made within a single timestep, possibly turning on and off the heating many times within a single
timestep. The duration of each of these sub-timesteps is then recorded (along with the temperatures during each
period) and the model reports the average conditions over the timestep (the standard TRNSYS output convention). The
model also considers the effects from minimum flow rates for operation, stepped heating capacity, time-delays,
temperature deadbands, minimum input fractions, and stand-by effects. NREL has adopted this model for their analysis
of DHW systems for the Building America program.
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$US 200
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Buried Pipe Wrapper for Renctangular Parallelepiped Tanks
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943
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This component interacts with the TESS storage tank model and provides a fully 3-D conduction soil wrapper for the
fluid-filled tank. Near and far field considerations are taken into account. This model is based on the TESS slab
model approach which has been recognized as a research standard by IEA task 34/43. A version of this component where
there is a structure (house etc.) above the tank is also available.
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$US 175
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Exposed Twin-Conductor Pipe
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950
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This component models the two pipes in a sheath piping system common to the geothermal heat pump and district heating
industries (Ecoflex TM). In this model, two pipes are encapsulated by an insulating material and then surrounded by a
cylindrical sheath. The model allows the user to specify whether the pipes are flowing in the same direction or
opposite directions. Pipe-to-pipe interaction is considered. The heat losses via convection to the ambient air and
radiation to the surroundings are calculated by the model.
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$US 150
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Buried Twin-Conductor Pipe
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951
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This component models the two pipes in a sheath piping system common to the geothermal heat pump and district heating
industries (Ecoflex TM). In this model, two pipes are encapsulated by an insulating material and then surrounded by a
cylindrical sheath. The model allows the user to specify whether the pipes are flowing in the same direction or
opposite directions. Pipe-to-pipe interaction is considered. The cylindrical sheath (outer pipe) is surrounded by a
fully 3-D radial conduction model of the ground that includes the impact of energy storage in the ground.
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$US 200
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Evacuated Tube Solar Collector
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965
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This component is nearly identical to the new Type 539 solar collector model, but utilizes bi-axial incidence angle
modifiers to allow optically non-symmetric collectors to be studied.
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$US 200
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Icon
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Name
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Type Number
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Description
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Cost
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Source Code
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DLL
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Proformas
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Technical Doc
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Example
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Sample Catalog Data
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Performance Map Cooling Coil
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697
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In many cases, a user wishes to utilize a cooling coil in a simulation for which detailed performance data is
available (usually from a manufacturer’s web site). This component utilizes external data files that provide the
normalized capacity (both total and sensible) as a function of the entering air dry bulb temperature, entering air
wet-bulb temperature, the air flow rate, the entering water temperature and the entering water flow rate.
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2 / $US 150
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Printegrator
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933
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Finally someone wrote a component that combines the Type 24 integrator and the Type 25 printer into one model. The
user has the option of specifying the integration interval (and therefore the printing interval) including monthly
summaries, providing detailed descriptions via Labels, specifying units of the variables (instead of initial values),
and skipping the integration on selected variables (and just printing the instantaneous value). We use this
component in all of our simulation and it saves a lot of time! The output from this model is directly importable
into Microsoft Excel and other spreadsheet applications.
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2 / $US 150
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Air Conditioner
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964
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Using the approach popularized by the DOE-2 simulation program, the performance of an air conditioner can be
characterized by bi-quadratic curve fits. In this model, normalized multipliers for the total cooling capacity, the
sensible cooling capacity, the energy input ratio, and the coil bypass fraction are calculated based on the coil
entering air conditions and the ambient temperature. The capacity is assumed to ramp up exponentially to its steady
state value based on a user-specified time constant.
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2 / $US 150
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Air Source Heat Pump
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966
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Using the approach popularized by the DOE-2 simulation program, the performance of an electric air-source heat pump
can be characterized by bi-quadratic curve fits. In this model, normalized multipliers for the total cooling
capacity, the sensible cooling capacity, the cooling power, the total heating capacity, the heating power, and the
coil bypass fraction are calculated based on the coil entering air conditions and the ambient temperature. The
capacity is assumed to ramp up exponentially to its steady state value based on a user-specified time constant.
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2 / $US 150
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Forced-Air Furnace
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967
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In this model, the performance of a forced-air furnace is characterized by a constant heat input ratio. The heating
capacity is assumed to ramp up exponentially to its steady state value based on a user-specified time constant.
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2 / $US 150
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Running Total and Averages
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939
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This component calculates the running totals (integrated) and running averages over a running user-specified time
range. For example, this program could calculate the average temperature over the last 24 hours or the water heater
gas consumption over the last 4 hours.
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2 / $US 150
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