1 Dynamic heat pump system with capacity control Hatef Madani
Dec. 2009
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2 Project goals Creating a family of models able to represent
the dynamics of the real heat pump system consisting of the
building, the heat pump unit, the heat source, pump, storage tank,
climate, etc. A quantitatively evaluation of different techniques
for capacity control and control strategies for heat pump
systems.
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3 Result example: Variable capacity vs. on/off controlled heat
pump system Dynamic COP of both variable speed and on/off
controlled GSHP
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4 Result example: Optimum mass flow rate of secondary
refrigerant Overall COP and heat capacity vs. mass flow rate of
secondary refrigerant at different compressor speed
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5 Examples of conclusions Retrofitting a frequency inverter to
the on/off controlled heat pump to omit the electrical auxiliary
heater Finding the optimum brine mass flow rate depending on the
design objective (e.g. COP or heat capacity maximization)
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6 List of publications Internal report called Capacity control
in heat pump systems:methods and strategies was submitted in 2008.
The paper called Variable capacity heat pump systems, modeling and
simulation was published in 9 th IEA Heat pump conference, 2008.
The project was presented and described in Rehva journal (the
journal of federation of European HVAC association), 2009. Two
papers called Ventilation heat recovery with run around coil:
System analysis and a study on efficiency improvement Part I and II
were published and presented in ASHRAE Region-At-Large conference,
2009. The paper called Retrofitting a variable capacity heat pump
to a ventilation heat recovery system: modelling and performance
analysis was submitted to the IntrenaTional Conference on Applied
Energy (ICAE), 2009.
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7 List of publications The paper called Capacity control in
ground source heat pump systems, Part I:modeling and simulation is
ready to submit to Journal of International Institute of
Refrigeration. The paper called Capacity control in ground source
heat pump systems, Part II: Comparative analysis between on/off
controlled and variable capacity systems is almost ready to submit
to Journal of International Institute of Refrigeration. The paper
called The ground source heat pump: a system analysis with a
particular focus on the U-pipe borehole heat exchanger will be
submitted to 14 th ASME international heat transfer conference,
before Jan. 15 th 2010. A quantitatively evaluation of different
techniques for capacity control and control strategies for heat
pump systems.