Cooling with a WEM Wall Heating System

It goes without saying that you can use wall heating systems also for cooling purposes, when running cold instead of warm water through the pipes.

Unlike conventional air-conditioning systems, wall and ceiling panels are silent and do not create a draught.

Where high cooling loads are involved, as in commercial buildings or in the Mediterranean region, we recommend ceiling cooling systems with specially treated panels.

Application in practice

You can use your WEM Wall Heating Systems for both, heating and cooling purposes. In the second
case, the system is operated with cold water. The cooling performance of panel cooling systems
attains values of about 30 to 65 W/m² and remains below the possibly achievable heating output.
This is because the temperature of the cooling water must not fall below a specific level, which
depends on the indoor temperature and the humidity content. Otherwise, water vapour contained in
the air would condense on cold surfaces. To avoid this effect, either dew-point monitors are used, or
the water temperatures is limited to an uncritical level (of about 16 °C in our region).

In contrast to other cooling systems, WEM Climate Panels can normally bear temperatures below the
dew-point and condensation for short periods. This is because we use clay panels (instead of gypsum
or metal panels). You will not find discolouring or mildew spots on clay surfaces and dripping will not
start as early as with other materials.

In most cases, water chillers or heat pumps are used to cool the medium. Integrating a water chiller
into a heating system is quite laborious and you need a special automatic control system. In practice,
this solution is only used in larger commercial buildings such as in hotels or office buildings.

In the residential sector, panel cooling systems are always used in combination with heat pumps.
Borehole heat exchangers and groundwater heat pumps are suitable for "passive" cooling.
The chill water is cooled in the soil or groundwater and no additional energy is required, apart from
the power for the recirculation pump. Other heat pumps cool in an "active" manner:
The refrigerant circuit is reversed and the heat pump functions like a refrigerator.

To upgrade your heating to an air-conditioning system, we offer the IGLU panel cooling system in
cooperation with our partner MACK Thermotechnik. It consists of a pre-assembled cooling device
(heat pump), which can easily be integrated into the existing heating system.

In most cases, the use of a heat pump facilitates the control of the indoor temperature considerably.
If cooling is required, the actuators on the heating manifold are opened and the cooling process runs
in an uncontrolled manner. You can lower the room temperature down to approximately 7 °C. For
lower temperatures, dehumidification of the indoor air would be required.

Panel cooling systems are based on heat radiation. Warm surfaces radiate heat to the cold surfaces
and are cooled this way, no matter whether the panel cooling is fitted inside the floor, the wall or the

However, ceiling installations have the highest cooling performance because a convective portion
adds to the radiation: Warm indoor air rises to the ceiling and is cooled there. If the panel cooling
should be used for heating, this is no problem. Due to its relatively low performance, ceiling cooling
systems are dimensioned generously. Therefore, you need only relatively low water temperatures to
run them in heating mode.