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7/30/2019 AirCon1 - grundfos
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AIR CONDITIONINGCHAPTER 1
Welcome to chapter 1
AIR CONDITIONING
7/30/2019 AirCon1 - grundfos
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AIR CONDITIONINGCHAPTER 1
• The different parts of an air conditioning system
• The best control mode for each part
• Correct control mode = savings
• Reduction of flow, pressure and power consumption
AIR CONDITIONING
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AIR CONDITIONINGCHAPTER 1
Secondary pumps
Cooling surface
Cooling ceiling
Fan coils
Pressureholding
Heatrecovery
Cooling tower
Chiller
Primarypump
Air Conditioning System Overview
Buffer tank
Constant curve
Constant pressure
Proportional differentialpressure (calculated)
Proportional differentialpressure (measured)
Temperature control
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AIR CONDITIONINGCHAPTER 1
Constant curve mode
Pump is adjusted once andfor all
No need for throttle valve
• Used when there is a demand
for constant flow and head• Suitable for
• Primary pumps
• Cooling surfaces
Max RPM Duty point withthrottle valve
Duty point withoutthrottle valve
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AIR CONDITIONINGCHAPTER 1
Constant pressure mode
Pump speed providesconstant pressure at thepressure sensor
• Suitable for• Pressure holding systems
Max RPM
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AIR CONDITIONINGCHAPTER 1
Proportional differential pressure mode(calculated)
Head and speed are adjustedaccording to the setting of the differential pressuresensor
• Suitable for
• Secondary pumps• Mixing loop pumps
Max RPM
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AIR CONDITIONINGCHAPTER 1
Head is adjusted based onmeasurements in a referencepoint
• Suitable for• Secondary pumps
• Mixing loop pumps for fan coil andcooling ceiling systems
Max RPM
Proportional differential pressure mode(measured)
Head decreases when flow isreduced
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AIR CONDITIONINGCHAPTER 1
The performance of thepump is adapted to theperformance of the coolingtower
• Suitable for• Cooling towers
• Heat recovery system
Max RPM
Temperature control mode
Purpose: to keep the water
that is fed to the condenserat a constant temperature
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AIR CONDITIONINGCHAPTER 1
Constant curve
Constant pressure
Proportional differentialpressure (calculated)
Proportional differentialpressure (measured)
Temperature control
Control modes in an air conditioning systemwith a constant chiller
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AIR CONDITIONINGCHAPTER 1
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AIR CONDITIONING
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