Energy efficiency measures - Industrial - Ventilation - Heat recovery
Template assignment
Base Case
Proposed case
Template assignment
Base Case
- Several large makeup air units use glycol as heat transfer fluid
- Building fan and ventilation systems are on constantly
- Air flow rate is 350,000 m³/h with 100% fresh air
- Intake air damper is leaky
- Space heating temperature is constant at 20ºC
- Heating/cooling changeover temperature is 20ºC
- Natural gas fired steam boiler seasonal efficiency is 75%
- Natural gas rate is $8.5/GJ
Proposed case
- Minimise usage: reduce flow by 10% and install heat exchanger on ventilation system, heat exchanger efficiency is 15%, cost is $120,000
- Maximise efficiency: install economizer on boiler stack to preheat feedwater, increasing boiler efficiency to 80%, cost is $100,000
- Optimise supply: recover heat from other system (economizer on a furnace), heat recovered 2,800 MWh, cost is $340,000
Base case
Proposed case
Solution
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
