Active Thermal Cooling Technologies - Low Energy Cooling for Sustainable Buildings - page 154

6000

5000

Sorption cooling
Electrical chiller

4000

3000

2000

1000

0

Power
delivery

Electricity Aux. heating Water Total

Type of cost

Figure 5.45 Annual operating costs for the installed desiccant cooling system compared with an
electrical chiller

energy corresponds to only about 350 full load hours. In climates with higher cooling
demand and 1000 load hours, the price could then go down to D 0.3 per kWh. An
Austrian research team compared the costs of a district-heating-powered small DEC
system (6000m 3 h − 1 ) including an air handling unit with an electrical compression
chiller. For 960 full load hours, the team obtained cooling costs for the DEC unit
of about D 0.55 per kWh compared with D 0.51 to 0.56 per kWh for the electrical
cooling system (depending on the tariff structure). Also, here the capital costs are
about two-thirds of the total annual costs of the system (Simader and Rakos, 2005).

Figure 5.46 Distribution of total annual costs for the installed system including subsidy on the capital
costs