The client has engaged you to perform a final inspection on a demand-controlled ventilation system. SFP-the requirement was a maximum of 1.5 kW/(m3/s) at average pressure drop. Average air volume in over the operating time is calculated at 60% of the design air volume. How do you propose to lock the ventilation system in the correct operating position in relation to control the requirement? How can you measure the fan effects? You measure the fan power to 3.1 kW for the supply air fan and 2.5 kW for the extractor fan. The air volume is 10,500 m3 / h. What will be the SFP value? How many kWh / year more fan energy does this ventilation system use than a ventilation system such as has an SFP of 2.0 kW/(m3/s) at average pressure drop? Assume 4000 hours of operating time per year. b) You ask the contractor to change the plant so that the requirement for SFP is satisfied. The contractor says it is impossible. The plant is as energy efficient as it can get. There is no room for a larger one ventilation unit in technical room claims the contractor. You walk across the facility and find that the fan systems have a total efficiency of 64% stated by the supplier. Calculate the total pressure drop in the facility. You know that the selected unit supplier also offers better fans with composite wheels that have 3% (relatively) better efficiency than selected fan and fan motors that have 2% (relatively) better efficiency. In addition, the supplier has rotating recyclers with bypass as according to the supplier will reduce the pressure drop in the plant by 100 Pa (total for supply air and exhaust) on average over the year. There is room for a rotating recycler with a bypass in the technical room. What SFP value is it possible to achieve with these measures? The client has engaged you to perform a final inspection on a demand-controlled ventilation system. SFP-the requirement was a maximum of 1.5 kW/(m3/s) at average pressure drop. Average air volume in over the operating time is calculated at 60% of the design air volume. How do you propose to lock the ventilation system in the correct operating position in relation to control the requirement? How can you measure the fan effects? You measure the fan power to 3.1 kW for the supply air fan and 2.5 kW for the extractor fan. The air volume is 10,500 m3 / h. What will be the SFP value? How many kWh / year more fan energy does this ventilation system use than a ventilation system such as has an SFP of 2.0 kW/(m3/s) at average pressure drop? Assume 4000 hours of operating time per year. b) You ask the contractor to change the plant so that the requirement for SFP is satisfied. The contractor says it is impossible. The plant is as energy efficient as it can get. There is no room for a larger one ventilation unit in technical room claims the contractor. You walk across the facility and find that the fan systems have a total efficiency of 64% stated by the supplier. Calculate the total pressure drop in the facility. You know that the selected unit supplier also offers better fans with composite wheels that have 3% (relatively) better efficiency than selected fan and fan motors that have 2% (relatively) better efficiency. In addition, the supplier has rotating recyclers with bypass as according to the supplier will reduce the pressure drop in the plant by 100 Pa (total for supply air and exhaust) on average over the year. There is room for a rotating recycler with a bypass in the technical room. What SFP value is it possible to achieve with these measures