89 lines
4.2 KiB
XML
89 lines
4.2 KiB
XML
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<?xml version="1.0"?>
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<!-- c182s external heater
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Accoring to POH (4-33) one should use an external heater below 20°F / -6°C).
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The heater is implemented here as simple system:
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- once activated, the heat is applied slowly until reaching a maximum
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- once deactivated, additional heat cools down to 0°F.
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- the calculated difference is then applied as offset to outside-air-temperature and engine oil temperature.
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- these values are used by the priming code in fuel.xml to determine the correct priming value.
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Copyright (C) 2017 Benedikt Hallinger
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-->
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<system name="external-heat">
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<channel name="External Heat">
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<kinematic name="External Heater"> <!-- simulates heat slowly raising once heater applied -->
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<input>/engines/active-engine/external-heat/enabled</input>
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<traverse>
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<setting>
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<position>0</position>
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<time>0</time>
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</setting>
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<setting>
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<!-- time to raise to maximum applied heat -->
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<position>1</position>
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<time>300</time> <!-- reach max output at 5 minutes (=300s) -->
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</setting>
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</traverse>
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<output>/engines/active-engine/external-heat/applied-norm</output>
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</kinematic>
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<aerosurface_scale name="Heat degF applied"> <!-- define heat applied in degF -->
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<input>/engines/active-engine/external-heat/applied-norm</input>
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<gain>1.0</gain>
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<zero_centered>false</zero_centered>
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<domain>
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<min>0</min>
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<max>1</max>
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</domain>
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<range>
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<min>0</min>
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<max>77</max> <!-- 68°F = 20°C --> <!-- TODO: I currently don't know how much heat the heater outputs! currently this gives a limit of -40°C after which priming gets really hard -->
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</range>
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<output>/engines/active-engine/external-heat/applied-degF</output>
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</aerosurface_scale>
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<fcs_function name="Oil temp plus external heat">
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<function>
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<sum>
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<property>/engines/active-engine/external-heat/applied-degF</property>
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<property>/engines/active-engine/oil-compensated-temperature-degf</property> <!-- compensated for env-temp and low oil, see engine.xml -->
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</sum>
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</function>
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<output>/engines/active-engine/oil-final-temperature-degf</output>
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</fcs_function>
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<!-- todo: could be modelled more realistical, since engine radiation should also have a little effect -->
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<fcs_function name="Cowling environment air Temperature">
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<function>
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<sum>
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<property>/environment/temperature-degf</property>
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<property>/engines/active-engine/external-heat/applied-degF</property>
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</sum>
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</function>
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<output>/engines/active-engine/cowling-air-temperature-degf</output>
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</fcs_function>
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<!-- todo: should be better placed in engine.xml, but is not active there... -->
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<summer name="Engine Oil compensated environment Temperature">
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<input>/engines/active-engine/oil-temperature-degf</input>
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<input>-/engines/active-engine/oil-temperature-env-diff</input>
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<output>/engines/active-engine/oil-compensated-temperature-degf</output>
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</summer>
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</channel>
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</system>
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