Improved heat exchanging + PEM fuel cells (#10)

* ported LAE engine_dev

* added off-design PEM function

* started HX off-design combined with PEM

* added off design functions for HX and desired Q

* deleted old functions

* fixed H2 enthalpy and bug in gas_burn

* added A2219 as material for HX

* fixed bug in entropy complement for h2

* fixed bug in HX input

* better docs + added maxevals to HX optim

* undo changes to combustion model to pass tests

* eliminated WIP files

* eliminated pyplot from pemfc file

* small change to hydrogen R

* new PEM unit tests + improved HX unit tests

.gitignore

@@ -17,4 +17,5 @@ Manifest.toml
 *.pptx
 *.DS_Store
 docs/build/*
-.VSCodeCounter/*
+.VSCodeCounter/*
+.vscode/

Project.toml

@@ -16,6 +16,7 @@ Roots = "f2b01f46-fcfa-551c-844a-d8ac1e96c665"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+Trapz = "592b5752-818d-11e9-1e9a-2b8ca4a44cd1"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [compat]

docs/make.jl

@@ -31,8 +31,9 @@ makedocs(
         ],
     "Propulsion systems" => Any[
             "propulsion/propsys.md",
+            "propulsion/gascalc.md",
             "propulsion/hxfun.md",
-            "propulsion/gascalc.md"
+            "propulsion/PEMfuelcell.md"
         ],
     "Stability" => "balance/balance.md",
     "Mission and sizing" => Any[