GLN
A fair-faced concrete stair climbing across a concrete wall with rows of tie holes, in soft daylight.
Plate 1. Concrete stair in daylight. Stock photograph, not a GLN project.

Heat that belongs to the wall.

GLN is a radiant panel for heating and cooling. Water from an outdoor heat pump runs through slim aluminium fins, the room’s surfaces settle at the right temperature, and heat moves by radiation instead of blown air. See the wall section

  • No vents, no ductsThe whole system works without them.
  • No fan or compressor indoorsThe compressor stays in the outdoor unit.
  • No pipes on the wallThey come down inside it to one fitting.

What walls already do with heat

Concrete, plaster and brick take on the temperature around them and give it back slowly. GLN works with that. It sets the temperature of one more surface in the room, and the room’s other surfaces settle around it.

A board-formed concrete wall crossed by shafts of low sunlight, a steel railing along the top.

Plate 2. Board-marked concrete, late sun. Stock photograph.

Mass

Heavy materials take on the temperature around them and let it go slowly, so a wall stays warm after the light has moved on. Radiant heating uses the same exchange between surfaces, with water setting the temperature instead of the sun.

The shadow of a window frame falls as a cross of light on a pale plaster wall.

Plate 3. Window light on plaster. Stock photograph.

Surface

You feel a room’s surfaces as well as its air. Felt temperature is roughly the average of the two (ASHRAE 55, ISO 7730).

27Air, °C
22Walls, °C
24.5Felt, about
A single round concrete column in an empty grey hall, a pale wall behind.

Plate 4. Concrete hall with one column. Stock photograph.

Quiet

Nothing in the room moves air. There is no fan and no compressor indoors, so there is no hum at night and no draft on your neck. The one machine, the heat pump, stands outside.

Three cylindrical fittings bolted to the face of a bare concrete wall.

Plate 5. Fittings fixed to fair-faced concrete. Stock photograph.

On the surface

Whatever is fixed to the face of a wall stays in view. GLN needs water pipes, but they never show on the wall: they come down inside it from the ceiling and join the panel at a single fitting, as drawn in Fig. 1.

The wall, in section

A GLN panel adds 90 mm to the face of a wall. Everything else stays inside the wall or outside the building.

Fig. 1. Section through ceiling slab, lined wall and GLN panel A lined wall stands between a ceiling slab and a floor slab. Flow and return pipes run in the ceiling void, drop inside the wall cavity and join the panel at one fitting, shown enlarged in Detail A. The panel stands 90 mm off the wall, is 1800 mm tall and sits 300 mm above the floor. Arcs show heat radiating into the room. Detail A, enlarged 90 1800 300 Ceiling +2.600 FFL ±0.000 0 1 m 1 2 3 4 5 6
Fig. 1. Section through ceiling slab, lined wall and panel, with Detail A enlarged. Dimensions in mm.
  1. Ceiling slab and a lined wall, with a service cavity behind the finish.
  2. Flow and return pipes run in the ceiling void and drop inside the cavity.
  3. One fitting joins them to the panel through the lining. Nothing runs on the wall.
  4. The panel stands 90 mm off the finished wall.
  5. 1800 mm tall, 90 mm from wall to front edge, 300 mm above the floor.
  6. Heat moves by radiation to the room’s surfaces. No vents, no ducts, no fan.

  • Material schedule

    The panel is one more material on the wall, so its finish is chosen against the surface behind it. Five finishes, each matched to a wall it often meets. Gloss values are demo figures.

    The schedule moves sideways as you scroll.

    Swipe sideways for all five finishes.

  • Fair-faced concrete panel with a vertical joint and fine surface pores.
    Fair-faced concrete. Stock photograph.

    F1 Cast grey

    Against
    Fair-faced concrete
    Finish
    Matt powder coat, fine grain
    Gloss
    5 GU
  • Hand-worked green lime plaster, half in diagonal sunlight.
    Tinted lime plaster. Stock photograph.

    F2 Lime white

    Against
    Lime plaster and render
    Finish
    Matt powder coat, soft texture
    Gloss
    3 GU
  • A pale brick wall under grazing light, striped by the shadow of a grille.
    Brick under grazing light. Stock photograph.

    F3 Clay

    Against
    Brick and terracotta
    Finish
    Matt powder coat, warm grey-brown
    Gloss
    5 GU
  • Dark perforated metal sheet with raised dimples catching a grazing light.
    Perforated dark metal. Stock photograph.

    F4 Graphite

    Against
    Dark metal, timber, stone
    Finish
    Satin powder coat
    Gloss
    25 GU
  • 90 12 Wall face
    Fig. 2. Fin extrusion in plan. Demo profile, not to scale.

    F5 Natural

    Against
    Any wall; the fin itself
    Finish
    Clear anodised aluminium, brushed
    Gloss
    20 GU

Specification

One panel size is shown here. Outputs are demo figures; a project’s figures depend on the room and the climate.

GLN Wall 1800, radiant panel. Demo specification.
Size
Width × height × depth600 × 1800 × 90 mm
Wall face to front edge90 mm
Weight, filled24 kg
Output, demo figures
Cooling420 W per panel
Heating510 W per panel
Heat transferRadiation from aluminium fins
Connection
Water sourceOutdoor air-to-water heat pump
PipeworkInside the wall, down from the ceiling
Joint to panelOne concealed fitting
In the room
Vents and ductsNone, anywhere in the system
Fan and compressorNone indoors
CondensationNo condensation water appears indoors.
Finish
FinsExtruded aluminium
FinishesF1 to F5, see the material schedule
600 1800 300 FFL
Fig. 3. Front elevation. The fitting sits behind the top corner, shown dashed.

Request drawings, or come and stand in front of a panel

Request drawings

CAD section details for your project: the wall section, panel elevation and fixing, as DWG and PDF.

I would like

A concrete façade with a deep grid of window openings, small trees along its base.
Plate 6. Concrete façade. Illustrative, not the showroom building.

Visit the Wuhan showroom

A working panel on a finished wall, heating or cooling with the season. Stand in front of it and compare the air temperature with what you feel.

GLN showroom
18 Guanshan Avenue, Hongshan District
Wuhan, Hubei

Tuesday to Sunday, 10:00 to 18:00

Book a visit Call +86 27 5000 1234