Higher efficiency and lower operating cost with ClimateMachines™ compared to conventional heat exchangers

In comparison with battery and rotary heat exchangers, ClimateMachines™ have significantly lower operating costs. Evaporative cooling of the exhaust air gives cooling at a price of 0,4 SEK/kWh, which is 95% cheaper than district cooling.

Higher efficiency than conventional solutions

The calculations are made for a normalized year and investment costs have been equated as there are lower connection charges (about 150 000 SEK for cooling), and reduced costs for pipes and batteries.

A schematic airflow and technology diagram shows that the ClimateMachines™ principle provides higher efficiency than conventional air handling solutions, both during winter and summer.

Operating cost of Climate Machine compared with battery and rotary heat exchanger

The following data has been used to calculate operating costs and comparison with conventional heat exchangers in the table below:

Annual average 6.5 C
Dimensioning outdoor temperature (DOT) -18 C
Normal annual total 3,620 (SMHI)
Flow 10 m³
Operating hours 8,760 h
Investment SEK 1,900,000
Electricity costs SEK 1.0/kWh
District heating SEK 0.7/kWh
Cost of interest 4 %
Working life 20 years
Energy price increase 2 %
Supply air 19 C
Exhaust air 22 C
Effects from district heating to post-heating ClimateMachines™ 44 kW
Rotary heat exchanger 110 kW
Battery Transmitter 200 kW

The calculations also include the evaporative cooling in ClimateMachine™. The cost of the produced cold is only 0.04 SEK/kWh (water cost 15 SEK/m3) compared to the district cooling with the cost of 0.6 SEK/kWh.

The need for comfort cooling is estimated at 1000 h / year. A 10 m3/s ClimateMachines™ generates a cooling power of approximately 150 kW. In this case, it means a reduction of the fixed cost of the district cooling charges of approximately 150 000 SEK/year.