Why enthalpy counterflow plate heat exchangers?

2018-09-27

Nowadays buildings of high energy class are being constructed and the standards and requirements are stricter. Buyers seeking economy ventilation should provide comfort and low-energy consumption. KOMFOVENT offers ventilation units with enthalpy counterflow plate heat exchangers.

 

How the heat recovery works in the ventilation system?

One of the energy-consuming systems in the building is the ventilation system. It is necessary to have airflow inside the building to ensure the well-being of the people on the premises. (Sufficient fresh air is a basic hygiene requirement and common norm). Inside the ventilation system, heat recovery is applied from the exhaust air to save energy (heat or coolness), through heat exchangers (rotary or plate heat exchangers) or heat pumps, or the combined method – rotary heat exchanger + heat pump.

At the moment, the most popular types are rotary heat exchangers, which operate efficiently in the cold climate zone. They do not freeze in the winter period and the air is not only heated considerably, but it is humidified by the use of exhaust air humidity. During the summer, it efficiently saves the heat, thus ensuring optimum comfort on the premises throughout the year.

The second most popular type is counterflow plate heat exchangers, which effectively heat the air supplied and does not dry it. But, if the air temperature outside is low (cold), these exchangers become covered by ice. For to this reason, this type is more suitable for the warmer climate zones.

Recently, enthalpy counterflow plate heat exchangers, whose features are closer to those of the rotor heat exchangers, are gaining momentum. They save heat and coolness and control the humidity of the air supplied. They humidify the air in wintertime and dry the air in the summertime. The important advantage – enthalpy plate heat exchangers are not covered by ice during low outdoor temperatures. (Unlike the ordinary conterflow plate heat exchangers).

Enthalpy counterflow plate heat exchangers are special because the heat exchanger plates are made from a special membrane. This membrane allows the return of moisture back onto the premises (which cannot be done with conventional counterflow plate exchangers). The risk of freezing is lower when compared to traditional types, because:

  • part of the moisture is returned to the premises during heat exchange;
  • the membranes are made from a special elastic material, which is mechanically less vulnerable than aluminium.

 

KOMFOVENT Domekt CF ventilation units with enthalpy counterflow plate heat exchangers. Features and advantages

Patented membrane. A patented enthalpy heat exchanger made from a special membrane achieves not only the best thermal and moisture regeneration results, but is hygienic and durable. The special patented membrane transfers moisture from the exhaust air to the air supplied. No dirt or bacteria pass through the membrane.

Better indoor microclimate. The highest level of comfort inside premises: when the room temperature is 20–22 °C, optimal humidity is maintained. As shown in the graph below, the counterflow plate heat exchanger dries the air too much, which requires additional humidification to the premises.

Greater benefits. During the summer, the enthalpy heat exchanger does not allow excessive moisture to enter the premises, and in this way, it saves the coolness and reduces the cost of air conditioning.

Non- freezing. The enthalpy counterflow plate heat exchanger can operate without freezing down to -15 °C. on contrary the conventional plate heat exchangers start icing up when the outside air temperature falls below -4 °C.

More information on enthalpy enthalpy counterflow plate heat exchangers you may find here.