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Heat exchange models #183

Merged
merged 34 commits into from Dec 19, 2023
Merged

Heat exchange models #183

merged 34 commits into from Dec 19, 2023

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spahrenk
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@spahrenk spahrenk commented Nov 20, 2023 •
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Description

  • In this PR, the form Model refers to a manufacturer product; model refers to a physics representation.
  • This code simulates heat-exchange HPWH Models (AquaThermAire), in which tank fluid (currently water) remains isolated from a delivered-water line. A simple heat-exchange model was implemented for initial testing. Assigning the flag hasHeatExchanger as true applies this model. The model assumes heat transfer from each tank node to the inlet water line using an effectiveness coefficient (heatExchangerEffectiveness). This process is repeated for each node upward, in sequence. However, the initial AquaThermAire Model preset and file use a single node, so this model has not been directly tested.
  • One additional test schedule (villara_24hr67) has been added. This is run for the AquaThermAire Model preset and file. No regression test is performed for this Model, lacking an accepted output file for comparison. Test profile was changed to convert degF to degC and DR flag was changed to unlock condenser. Passes all HPWH and cse tests.

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      • exercising the code changes in the test framework, and/or
      • manually verifying the changes (as explained in the the pull request description above)
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    • Merge in main branch and address resulting conflicts and/or test failures.
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    • Make changes in response to reviewer comments
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@spahrenk spahrenk self-assigned this Nov 20, 2023
@spahrenk spahrenk mentioned this pull request Nov 27, 2023
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@spahrenk spahrenk changed the title Heat exchange Models - moved from fork Heat exchange models Nov 27, 2023
@spahrenk spahrenk mentioned this pull request Dec 6, 2023
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33 tasks
nealkruis
nealkruis requested changes Dec 11, 2023
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src/HPWHpresets.cc Outdated
@@ -515,7 +515,7 @@ int HPWH::HPWHinit_presets(MODELS presetNum) {

else if (presetNum == MODELS_StorageTank) {
setNumNodes(12);
setpoint_C = F_TO_C(127.0);
setpoint_C = 800.;
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This shouldn't be changing on this branch, and will likely cause conflicts when master is merged in.

test/AquaThermAire.txt Outdated
@@ -0,0 +1,71 @@
verbosity silent
numNodes 1 #number of nodes
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Change to 12?

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done

test/AquaThermAire.txt Outdated
volume 54.4 gal
UA 10.35 kJperHrC
depressTemp false
mixOnDraw true
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This should be false, the draw doesn't go into the tank at all, and it shouldn't cause any mixing of the water.

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done

@spahrenk
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Added function bottomTwelfth_absolute. Fixed function topThird_absolute (seems to be unused.)

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This is a primitive solution using the existing method to read hpwh spec files. Can improve with generalized-logic-node method (forthcoming).

nealkruis
nealkruis requested changes Dec 15, 2023
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src/HPWH.cc Outdated
@@ -63,6 +63,10 @@ const double HPWH::MAXOUTLET_R410A = F_TO_C(140.);
const double HPWH::MAXOUTLET_R744 = F_TO_C(190.);
const double HPWH::MINSINGLEPASSLIFT = dF_TO_dC(15.);

double makeC(const double T_F_or_C,const HPWH::UNITS units,const bool absolute){
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This can probably be inline, no?

The name is also not very descriptive. Maybe convertTempToC?

src/HPWH.cc Outdated
Comment on lines 1813 to 1816
std::shared_ptr<HPWH::TempBasedHeatingLogic> HPWH::bottomTwelfth_absolute(double decisionPoint) {
std::vector<NodeWeight> nodeWeights = getNodeWeightRange(0., 1./12.);
return std::make_shared<HPWH::TempBasedHeatingLogic>("bottom twelfth",nodeWeights,decisionPoint,this,true);
}
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I don't think this is needed anymore.

nealkruis
nealkruis requested changes Dec 18, 2023
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test/AquaThermAire.txt Outdated
heatsource 0 minT -25 F
heatsource 0 maxT 125 F
heatsource 0 hysteresis 1 F
heatsource 0 coilConfig wrapped
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Should probably be "submerged" based on conversations with Ben. What impact will this have on the simulation?

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Wrapped and submerged use different heat distributions. Simulation results are slightly altered.

@nealkruis nealkruis merged commit 58dd30b into master Dec 19, 2023
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@nealkruis nealkruis deleted the heat-exchange-models branch December 19, 2023 17:27
@spahrenk spahrenk mentioned this pull request Dec 20, 2023
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@nealkruis nealkruis nealkruis approved these changes

@chipbarnaby chipbarnaby Awaiting requested review from chipbarnaby

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