PrescribedHeatFlow
Models a prescribed heat flow rate at a thermal port, with optional temperature dependency.
This component defines a boundary condition that injects or extracts a specified heat flow rate at its thermal node
. The primary heat flow rate is determined by the external input signal Q
. A positive Q
value indicates that heat is flowing from this component into the system connected to node
. The model can also account for temperature-dependent variations in the heat flow. If the parameter alpha
is set to a value greater than zero, the heat flow is adjusted by a factor proportional to the difference between the temperature at the port (node.T
) and a specified reference temperature (T_ref
). This allows for simulating effects like temperature-dependent losses or efficiencies. The core behavior is defined by the equation:
Usage
PrescribedHeatFlow(T_ref=293.15, alpha=0.0)
Parameters:
Name | Description | Units | Default value |
---|---|---|---|
T_ref | Reference temperature for calculating temperature-dependent heat flow | K | 293.15 |
alpha | Temperature coefficient that scales the heat flow based on temperature difference | 1/K | 0 |
Connectors
node
- This connector represents a thermal node with temperature and heat flow as the potential and flow variables, respectively. (Node
)Q
- This connector represents a real signal as an input to a component (RealInput
)
Behavior
Source
# Models a prescribed heat flow rate at a thermal port, with optional temperature dependency.
#
# This component defines a boundary condition that injects or extracts a specified
# heat flow rate at its thermal `node`. The primary heat flow rate is determined by
# the external input signal `Q`. A positive `Q` value indicates that heat
# is flowing from this component into the system connected to `node`. The model can
# also account for temperature-dependent variations in the heat flow. If the
# parameter `alpha` is set to a value greater than zero, the heat flow is adjusted
# by a factor proportional to the difference between the temperature at the port
# (`node.T`) and a specified reference temperature (`T_ref`). This allows for
# simulating effects like temperature-dependent losses or efficiencies. The core
# behavior is defined by the equation:
# ```math
# \text{node.Q} = -Q \cdot (1 + \alpha \cdot (\text{node.T} - T_{\text{ref}}))
# ```
component PrescribedHeatFlow
# Acausal thermal port through which heat is exchanged
node = Node() [{
"Dyad": {
"placement": {"icon": {"iconName": "node_b", "x1": 900, "y1": 400, "x2": 1100, "y2": 600}}
}
}]
# Input signal defining the prescribed base heat flow rate
Q = RealInput() [{"Dyad": {"placement": {"icon": {"x1": -100, "y1": 400, "x2": 100, "y2": 600}}}}]
# Reference temperature for calculating temperature-dependent heat flow
parameter T_ref::Temperature = 293.15
# Temperature coefficient that scales the heat flow based on temperature difference
parameter alpha::LinearTemperatureCoefficient = 0.0
relations
node.Q = -Q*(1+alpha*(node.T-T_ref))
end
Flattened Source
# Models a prescribed heat flow rate at a thermal port, with optional temperature dependency.
#
# This component defines a boundary condition that injects or extracts a specified
# heat flow rate at its thermal `node`. The primary heat flow rate is determined by
# the external input signal `Q`. A positive `Q` value indicates that heat
# is flowing from this component into the system connected to `node`. The model can
# also account for temperature-dependent variations in the heat flow. If the
# parameter `alpha` is set to a value greater than zero, the heat flow is adjusted
# by a factor proportional to the difference between the temperature at the port
# (`node.T`) and a specified reference temperature (`T_ref`). This allows for
# simulating effects like temperature-dependent losses or efficiencies. The core
# behavior is defined by the equation:
# ```math
# \text{node.Q} = -Q \cdot (1 + \alpha \cdot (\text{node.T} - T_{\text{ref}}))
# ```
component PrescribedHeatFlow
# Acausal thermal port through which heat is exchanged
node = Node() [{
"Dyad": {
"placement": {"icon": {"iconName": "node_b", "x1": 900, "y1": 400, "x2": 1100, "y2": 600}}
}
}]
# Input signal defining the prescribed base heat flow rate
Q = RealInput() [{"Dyad": {"placement": {"icon": {"x1": -100, "y1": 400, "x2": 100, "y2": 600}}}}]
# Reference temperature for calculating temperature-dependent heat flow
parameter T_ref::Temperature = 293.15
# Temperature coefficient that scales the heat flow based on temperature difference
parameter alpha::LinearTemperatureCoefficient = 0.0
relations
node.Q = -Q*(1+alpha*(node.T-T_ref))
metadata {}
end
Test Cases
No test cases defined.
Related
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