ThermalCollector refactored to @mtkbuild syntax

Author: matthew-kapp

src/Thermal/HeatTransfer/ideal_components.jl

@@ -201,6 +201,8 @@ This is a model to collect the heat flows from `m` heatports to one single heatp
 
   - `m`: Number of heat ports (e.g. m=2: `port_a1`, `port_a2`)
 """
+
+"""
 @component function ThermalCollector(; name, m::Integer = 1)
     port_a = [HeatPort(name = Symbol(:port_a, i)) for i in 1:m]
     @named port_b = HeatPort()
@@ -211,3 +213,22 @@ This is a model to collect the heat flows from `m` heatports to one single heatp
     end
     ODESystem(eqs, t, [], []; systems = [port_a..., port_b], name = name)
 end
+"""
+
+@mtkmodel ThermalCollector begin
+  @structural_parameters begin
+    m::Integer = 1
+  end
+
+  @components begin
+    port_a = [HeatPort(name = Symbol(:port_a, i)) for i in 1:m]
+    port_b = HeatPort()
+  end
+
+  @equations begin
+    port_b.Q_flow + sum(k -> k.Q_flow, port_a) ~ 0
+    port_b.T ~ port_a[1].T
+    [port_a[i].T ~ port_a[i + 1].T for i in 1:(m - 1)]
+  end
+
+end