Desiccant CoolingA good deal for everyone

Henrik Näsström

In general

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• Creates air cooling from district heating• An alternative to traditional methods• Can make incoming air colder from 30°C to 15°C.• Using district heating instead of electricity• No noisy compressor or condenser, no environmentally harmful

refrigerants• Built using proven standard components• Requires large ventilation space

Economy

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• More expensive than conventional units (30-50%)• Very good heat recovery• Increased basis for environmentally friendly electricity due to CHP• Equal investment costs (in this case)• Lower operating costs (in this case)

Components

Evaporative air cooler Drying rotor

Evaporative coolerIf you add 1 gram of water to 1 kg of air you reduce the air temperature 2,5°C

Drying rotor If you take away 1 gram of water from 1 kg of air

you increase the air temperature 3,3°C

Physics

30 ºC

10 g/kg

40 ºC

7 g/kg

25 ºC

7 g/kg

25 ºC

10 g/kg20 ºC

12 g/kg

17,5 ºC

10 g/kg

55 ºC

12 g/kg

35ºC

12 g/kg45ºC

15 g/kg

Function

• Heating demand of 540 MWh in a building• 80% efficiency for a conventional ventilation gives a need of 108 MWh• 90% efficiency with desiccant cooling system provides a heating

requirement of 54 MWh• In summer it need about 30 - 45 MWh of heat to create desiccant cooling• 0,7 – 1,0 kWh of heat to generate 1 kWh of cooling

Example

Consumption

Consumption

www.malarenergi.se

henrik.nasstrom@malarenergi.se