Power Conditioning Unit Parameters

This database contains the parameters for hundreds of commercial inverters for use with Type175.

Created by Anton Driesse, June 2009

[zip]

Cogeneration plant

This routine calculates the first and second law as well as the purpa efficiency of a cogeneration plant which supplies electricity and heat in the form of steam or hot water.

Created by F. D. Drake, Oct 1998

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Comparative Economic Analysis of two plants

This routine compares the economic attractiveness of two different plants (base case:b versus a:alternative) by performing the various economic analysis techniques (see modes)

Created by F. D. Drake, Oct 1998

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Node

When a project becomes very big, it may be very difficult to follow all of the connection lines between components. In addition, in some simulations the outputs from one component may be used as inputs for many other components. The project layout may look very crowded with lines coming from the same component. This Type acts like a node that can be used as an intermediate depository of the information coming from another component.

Created by Diego A. Arias at the Solar Energy Laboratory, Feb 2006.

[zip]

Radiative Sky Temperature Estimator

This component calculates the sky temperature from data in a full TMY weather file. Some of these data are missing, in which case they are replaced with the nearest previously recorded values.

Created by David Summers, Feb 1995.

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Unglazed Transpired Collector System

For this model to correctly calculate the performance of transpired collectors, the approach velocity (appvel) should be greater than 72 m/hr. Otherwise, there will be convection losses from the collector between the holes, and the collector's performance will be reduced. Also, the collector pressure drop (pcol) should be at least 0.025 Pa to ensure uniform flow through the collector. Otherwise, sections of the collector will become hotter than others, and radiation losses from the collector will increase. Again, this will reduce the collector's performance. To achieve a sufficient pressure drop, the porosity (por) should be about 0.005 to 0.01 for the given approach velocities. If these approach velocity and pressure drop conditions are not met, this subroutine will write a warning to a file. It is important to emphasize that a collector _can_ be operated at approach velocities and pressure drops below these values, but this model will just over predict the performance.

Created by David Summers at the Solar Energy Laboratory, Dec 1995.

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This subroutine models a serpentine collector. A serpentine collector can be modeled using the conventional header-riser parallel flow collector model, if the number of turns is greater than about fifteen.  The only difference is the calculation of the heat transfer coefficient, which is calculated for a long tube.

Modified by Myrna Dayan , Aug 1997.

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Phase change material

This subroutine models a phase change material. The zip file contains the proforma, sourcecode, dlls and an example of how to use it with Type56.

Created by Piia Lamberg, at Helsinki University of Technology.

[Zip]

Stratified Fluid Storage Tank with Internal Heat Exchanger

This subroutine models a hot water store with internal or mantle heat exchanger.

Created by R.H. Marshall and C.L.W. Li, University of Wales College of Cardiff, 1986 to 1989.

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This subroutine models the operation of an ice storage tank. The tank is characterized by its capacity (in terms of kilograms of ice), volume, height, and overall loss coefficient. Inputs are: entering water temperature, water mass flow rate, the ice generation rate (from an ice harvester), and the temperature of the environment. There is one derivative: the mass of ice in the tank at the beginning of the simulation period. Outputs are: leaving water temperature, the water mass flow rate, ice mass at the end of the simulation time step, the ice "burn rate", the rate of heat loss to the environment, the rate of energy "input" to the tank via ice generation, and the rate of energy "supplied" to the water stream.

Modified by Stefan Behschnitt , Jun 1996.

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This subroutine computes the bulk temperature a surface-water body. The water body can be used as a heat source/sink in a closed-loop water- source heat pump system. The bulk temperature is determined using a lumped capacitance approach. This model assumes that one spool is one flow circuit.

Developer: Andrew Chiasson and Dr. Jeffrey Spittler , April 1999.

[Fortran code] [zip]

Flow Controller for A/C System

This TRNSYS type is a flow controller that calculates the percentage of flow that should pass through the A/C coil in order to minimize the sensible reheat in the system. The A/C coil outlet temperature is constrained to above 38 F so that frosting of the coil is not encountered.

Created by Todd B. Jekel, Dec 1990.

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'Sticky' Proportional Controller

This component is to be used ONLY to pass control signals between superblocks. The variable defined by its output should not be solved simultaneously.

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Steam Pipe

This subroutine calculates the heat losses and pressure drops in a steam pipeline.

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Contaminant Transport

Calculates the concentration of a contaminant in a multiple-zone ventilated volume as a function of simulation time.

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Centrifugal Fan

This Type represents a Ventilator type load, which is designed to run with an electric motor.

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Centrifugal Pump

This Type represents a centrifugal pump, which is designed to run with an electric motor. The model requires two sets of data: head-flowrate data at reference speed and efficiency-flowrate data at reference speed. A linear regression is performed to fit a curve through those data. The normal equations are solved using Gaussian elimination with partial pivoting. Newton's method is implemented to solve a system of nonlinear equations.

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Conduit (Duct or Pipe)

The conduit model is designed to account for three effects: thermal losses to ambient conditions, transport delays, and dynamics due to thermal capacitance. The model has four modes, determined by the last parameter. If the absolute value of MODE is 1, air properties are used and the model represents a duct. If the absolute value of MODE is 2, water properties are used and the model represents a pipe. The sign of MODE determines the method used to calculate thermal capacitance effects.

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Damper or Valve

This model represents dampers or valves having inherent characteristics which are linear, exponential, or intermediate between linear and exponential.

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Fan or Pump

Calculates a pressure rise and an efficiency as functions of a mass flow rate, using dimensionless performance curves.

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Flow Merge

This component models the merging of two flow streams.

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Flow Split

This component models the division of a flow stream into two flow streams. It calculates the mass flow rates at the two outlets, and the pressure at the single inlet.

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'Grounded' Water or Air Split

This component models the division of a flow stream into two flow streams.

[Fortran code] [More...]

Linear Valve with Pneumatic Actuator

The valve model includes a pneumatic actuator model.

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Mixing Dampers and Merge

This component represents a pair of mixing dampers, mechanically linked so that one damper opens as the other closes. The first inlet is closed when the input control signal, C, is zero, and open when C is one. The reverse is true for the second inlet. Hysteresis effects and an actuator time constant are not included in the model.

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Plenum

The output of this component is simply the sum of its inputs. The single parameter, n, specifies the number of input flow rates to be summed. Up to ten flow rates may be added together. Ten input flow rates are required by the model, but only the first n are summed. The remaining inputs are ignored.

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Three-Way Valve with Actuator

This component represents a valve with two inlet ports and one outlet port.

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Four-Way Valve

This component simulates the function of a four way valve.

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Modified Type 7 Absorption Air Conditioner

This is the modified TYPE 7 absorption air conditioner from TRNSYS 13.1.

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Modified Type 53 Centrifugal Chiller

This subroutine models the operation of a chiller based on a five parameter equation relating the dimensionless power to the dimensionless load and deviations from design entering condenser and chilled water set point temperatures. It differs from "type 53" in that it does not require an external data file. Given values for the chilled water set point temperature, the evaporator water inlet temperature and mass flow rate, and the condenser water inlet temperature and mass flow rate, the subroutine will return the evaporator water outlet temperature (and mass flow rate), the condenser water outlet temperature (and mass flow rate), the load, the power requirement, the condenser heat rejection, and the coefficient of performance. A control variable allows the chiller to be shut off when it is not needed.

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Water-LiBr Absorption Chiller

This subroutine models a commercial (> 100 ton) gas fired double-effect water-lithium bromide absorption chiller in parallel flow configuration. The chiller is modeled after a york parallel flow chiller.

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Evaporative Humidifier from

This component, which is based on a model developed by Chi, represents an air stream passing over a water pan or through a porous pad, increasing the humidity and decreasing the temperature of the air.

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Steam Nozzle

The steam nozzle calculates a mass flow rate and exit steam temperature, given the downstream pressure and the upstream steam stagnation temperature and pressure.

[Fortran code] [More...]

Steam Spray Humidifier

The steam spray humidifier model calculates an outlet air temperature, flow rate, and humidity ratio for a constant pressure process in which steam is injected into an air flow stream to increase the humidity of the air.

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Heat Exchanger

This subroutine models a heat exchanger in order to calculate the necessary massflow to achieve a certain change of state of the second fluid.

[Fortran code] [More...]

Sensible Heat Exchanger in Heating Mode

This subroutine calculates the maximum effectiveness of a HX with the constraint that no excess water accumulates on the matrix.

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Enthalpy Heat Exchanger in Heating Mode

This subroutine calculates the maximum effectiveness of an EX and the according outlet states with the constraint that no excess water accumulates on the matrix.

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Enthalpy Exchanger and Heat Exchanger in Cooling Mode

This subroutine calculates the maximum effectiveness of an EX or HX and the according outlet states in the cooling mode.

[Fortran code] [More...]

Steam to Air Heat Exchanger

This component represents a cross flow heat exchanger consisting of horizontal tubes with circular fins.

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Steam Boiler

Calls subroutines steam and solver.

Written by Georges Liebecq at the Solar Energy Laboratory, 1988.

[Fortran code] [More...]

Dynamic Thermal Capacitance Model

It models a thermal capacitance. It can be used in order to take into account the thermal behavior of the pipes or of the boiler.

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Sum of a Number of Inputs

This type calculates the sum of a number of inputs.

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Insulated Pipe

This is a simplified pipe model. The heat exchange coefficient is supposed constant and is given as a parameter.

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Non-Insulated Pipe

Calls the subroutine pipe which calculate the heat transfer coefficient using simplified laws, the heat transfer of the pipe and the exhaust temperature of the fluid going through the pipe.

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Feeding Column

Model of column for a hot water heating system. Calls the subroutine pipe which calculate the heat transfer coefficient using simplified laws, the heat transfer of the pipe and the exhaust temperature of the fluid going through the pipe.

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Combined Component: Pipe, Thermostatic Valve, and Radiator

This combined unit has been created to avoid a large number of units. In consists of a pipe element followed by a thermostatic valve, a radiator and another pipe.

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Building: Specific to this Model

Simplified model of La Chaumiere building.

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Perfect Three-Way Valve

The valve has a logarithmic characteristic for the direct flow and a linear characteristic for the bypass.

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Specific Controller

This is a very simple component that calculates the set point temperature for the boiler and the three-way valve and the mass flow rates of water.

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Static Boiler

This is the boiler used in the simulation of the heating system of a residential building (La Chaumiere).

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