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Heating - Solar air heater - Industrial - Transpired-plate - Roof

Template assignment

Base Case

• Industrial building of 5,000 m² with an indoor temperature of 21ºC
• Minimum and maximum delivered air temperatures are 17ºC and 22ºC
• Collector air is distributed at ceiling level and mixes with ceiling air that is 1º C warmer than floor-level air
• Thermal resistance of the roof is 4.0 m² - ºC/W, thermal resistance of the walls is 1.5 m² - ºC/W
• Design airflow rate is 10,000 m³/hour
• The building ventilation system is operating 16 hours per day during weekday and 8 hours per day during weekends
• Natural gas heating with an efficiency of 70%
• Natural gas rate is $0.40/m³

Proposed case

• The base case natural gas heater is supplemented by 200 m² of rooftop mounted (azimuth of 0º) transpired-plate solar air heating collector units that preheat the air
• These collectors have a performance factor of 0.75 and an absorptivity of 0.95
• The units are mounted on an angle of 60º facing due south
• The percentage of time that the heating ventilation system is used are as follows:

• Assume a 0.70 wind sheltering coefficient (this could be done by multiplying each of the wind speed values by 0.70 in the climate data section of the Start worksheet)
• The ventilation fan consumes an additional 5 W/m² of collector, compared to the base case
• The installed cost of the collector is around $200/m² for this installation
• Maintenance costs are minimal
• Electricity rate is $0.07/kWh

Other opportunity

• A government incentive is applied to the installation cost of the solar collector

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.