Post on 25-Dec-2015
transcript
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