Využití odpadního tepla

Since 2000 our company has been primarily focused on promoting of cooling systems with effective usage of waste heat from cooling processes. We have invested a considerable amount of money in development of pilot projects and in experience obtained during the equipment operation. Thus, we can offer you fully tested and functioning technical solutions that enable to achieve provable operating savings. When developing the cooling systems with waste heat usage, our company has added a very important element to the equipment – latent cold accumulation (so-called "ice bank"). Most industrial cooling processes do not have balanced and parallel demands on cold delivery and waste heat usage, which is possible to solve effectively via already mentioned cold accumulation. This element enables to cover peak demands of cold and keep waste heat for later usage – during repeated charging of cold accumulator.

Use of latent cold accumulator brings new alternatives in design and construction of the cooling equipment and possibilities of using all the waste heat.

According to the state of its charging, the latent accumulator is either the source of cold or low-potential heat:

  • When fully charged, the accumulator works as source of cold which can be taken at any time during cold peak demand.
  • When completely discharged, the accumulator works as source of low-potential heat which can be taken at any time during peak demand for waste heat recovery, e. g. heating of process warm water.
  • It means that in case the latent accumulator is not fully charged or discharged, peak demand of both cold and heat is covered by cooling equipment/heat pump. The accumulator functions as “a spring” in the system.

The CHTS company was the first in the Czech republic to implement quite a new system of cold accumulation for low-temperature applications, the functional principal of which is protected by the industrial design.

Examples of Usage:

1) Poultry Chilling Tunnel

During the process of continuous chilling of slaughtered poultry from 38°C to 4°C, it is necessary to take away a big amount of heat from the chilled poultry. The cooling equipment works at full capacity and the part of cold is obtained from latent accumulator. At the same time it is necessary to fulfill great demand on heating of process warm water with the help of waste heat from the cooling equipment. In this moment the requirements for both cold and waste heat occur at the same time. However, when the poultry slaughter is finished, the requirement for cold markedly decreases, because the chilling tunnels are put out of operation. This is followed by peak demand of warm water for washing of slaughter facilities. In this moment charging of the latent accumulator starts. Thereafter, waste heat for heating of process warm water is obtained from the condensing part of the cooling equipment, whereas cold is stored in the latent accumulator and will be used for poultry chilling the next day.

This type of equipment brings the following benefits:

  • smaller cooling equipment/li>
  • lower instant consumption of electric current (15 min. in maximum)
  • higher total effectiveness
  • heat source with high capacity, which is not dependent on actual cold consumption

This principle can be used for both direct and indirect cooling systems with any kind of coolant (including ammonia).

2) Refrigeration Storeroom

During the day, when the higher ambient temperature causes maximum consumption for cooling of refrigeration storerooms, about 30 % is covered by the latent accumulator. In the evening and night hours, accumulator recharging is consequently activated, during which waste heat is simultaneously obtained. The waste heat can then be used for heating of process warm water.

In the evening, thanks to the lower ambient temperature and considerably higher evaporative temperature (only -8°instead of -30°C during accumulator charging), cold accumulation takes place with much higher cooling effectiveness ( COP up to 4,5 compared to COP 2,2 during the day).

This type of equipment brings the following benefits:

  • smaller cooling equipment
  • lower instant consumption of electric current (15 min. in maximum)
  • higher total effectiveness (decrease of total current consumption by 15 % in minimum)
  • possibility to increase capacity of cooling units with insufficient capacity without rebuilding the whole cooling equipment (increase the power of compressors, increase the size of condensers, alterations on pipelines and exchangers). In order to use the cold accumulation, the existing equipment needs to be expanded only by two exchangers.

This principle can be used for both direct and indirect cooling systems with any kind of coolant (including ammonia).

3) Other Applications:
  • Cold sources for production of ice water in the diary and brewery industries.
    • Sources of cold accumulation for production of ice water under highly changeable load with waste heat recovery.
  • Cold sources for plastics processing.
    • Cascade systems of injection press cooling.
  • Cooling technologies for winter stadiums.
    • Indirect systems of ice surface cooling with waste heat recovery.

Reference Projects:

Meat and poultry processing

  • Rabbit Trhový Štěpánov- central system of cooling for two poultry slaughter houses, distribution stores
  • Lahůdky Cajthaml – central system of cooling for delicatessen production

Cold sources for ice water production

  • Mlékárna Bohoušovice – cold accumulation for covering the peak demand of ice water
  • Moštovna Lažany – cooling of pasteurizing columns for drink production
  • Sýrárna ORRERO Litovel – central system of cooling for milk products
  • MILSY Bánovce nad Bebravou – accumulation system of ice water production, cooling of storage boxes

Cold sources for plastics processing

  • Gillete Czech – mobile source of cold for cooling of injection presses
  • Cadence Innovation – cascade system of injection press cooling

Cooling technologies for winter stadiums

  • Winter stadium in Ústí nad Labem – integrated cooling system and accumulation source of cold for air-conditioning
  • Ice hockey hall in Brno – integrated cooling system and accumulation source for the hall background
  • Winter stadium in Plzeň – Košutka – integrated cooling system and accumulation source of cold for air-conditioning

At present the H+H technika company has started to get ahead also on the markets of Western Europe (Switzerland, Austria) in the areas of dairy industry, chocolate processing and crop drying.

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