1
In which systems can the measured proportional differential pressure used?
2
In which types of systems is the constant pressure mode used?
3
What is the average payback time of installing a system with variable speed pumps?
4
In which systems can the calculated proportional differential pressure mode be used?
5
Which element is the most expensive of them all?
6
In the case story, which system is the most expensive?
Test results
Q: In which systems can the measured proportional differential pressure used?
A: Systems where the differential pressure is measured over the pump and the valve authority is below 50%
Q: In which systems can the measured proportional differential pressure used?
A: Systems where the differential pressure is measured in the system and the valve authority is below 50%
Q: In which systems can the measured proportional differential pressure used?
A: Systems where the differential pressure is measured in the system and where the valve authority is higher than 50%.
Q: In which types of systems is the constant pressure mode used?
A: Systems where the valve authority is higher that 50% of the total pressure loss
Q: In which types of systems is the constant pressure mode used?
A: Systems where the valve authority is lower than 50% of the total pressure loss
Q: In which types of systems is the constant pressure mode used?
A: None, this control mode is outdated
Q: What is the average payback time of installing a system with variable speed pumps?
A: Less than a year
Q: What is the average payback time of installing a system with variable speed pumps?
A: 1-2 years
Q: What is the average payback time of installing a system with variable speed pumps?
A: 2-3 years
Q: In which systems can the calculated proportional differential pressure mode be used?
A: In systems where measurement of the differential pressure in the system is not an option and where the valve authority is more than 50%
Q: In which systems can the calculated proportional differential pressure mode be used?
A: In systems where measurement of the differential pressure in the system is not an option and where the valve authority is below 50%
Q: In which systems can the calculated proportional differential pressure mode be used?
A: In systems where the differential pressure is measured in the system and where the valve authority is below 50%
Q: Which element is the most expensive of them all?
A: Initial cost
Q: Which element is the most expensive of them all?
A: Energy cost
Q: Which element is the most expensive of them all?
A: Maintenance cost
Q: In the case story, which system is the most expensive?
A: A system with constant flow and a single constant speed pump
Q: In the case story, which system is the most expensive?
A: A variable flow system with a single constant speed pump
Q: In the case story, which system is the most expensive?
A: A one pump system with variable flow and variable pump speed where the pump is put into calculated proportional differential pressure mode