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AIR CONDITIONINGCHAPTER 1

Welcome to chapter 1

AIR CONDITIONING

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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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