protected NCompositeShape CreateHeatExchanger(NPointF location, float scale)
        {
            NCompositeShape HeatExchanger = new NCompositeShape();
           
            GraphicsPath graphicsPath = new GraphicsPath();
            graphicsPath.StartFigure();
            PointF[] points = new PointF[]
   {
    new PointF(175,140),
    new PointF(175,160),
    new PointF(150,170),
    new PointF(200,170),
                new PointF(175,180),
                new PointF(175,200),
   };

            graphicsPath.AddLines(points);

            NPointF[] points2 = new NPointF[]
   {
    new NPointF(145,140),
    new NPointF(205,140),
    new NPointF(205,200),
    new NPointF(145,200),
   };

            NPolygonPath exterior = new NPolygonPath(points2);

            HeatExchanger.Primitives.AddChild(new NCustomPath(graphicsPath, PathType.OpenFigure));
            HeatExchanger.Primitives.AddChild(exterior);
            HeatExchanger.Style.FillStyle = new NColorFillStyle(Color.Empty);

            HeatExchanger.UpdateModelBounds();

            HeatExchanger.CreateShapeElements(ShapeElementsMask.Ports);

            HeatExchanger.Location = location;
            HeatExchanger.Width = HeatExchanger.Width * scale;
            HeatExchanger.Height = HeatExchanger.Height * scale;

            return HeatExchanger;
        }