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Optimizing Heat Pump Systems with Dynamic Capacity Control

This project aims to develop dynamic models for heat pump systems, evaluate capacity control techniques, and optimize overall performance. Examples include analyzing COP variations and determining optimal mass flow rates. Findings focus on retrofitting strategies and maximizing efficiency based on design objectives. Publications have covered topics like retrofitting heat pumps and analyzing ventilation heat recovery systems. Planned submissions include comprehensive analyses of ground source heat pump systems and U-pipe borehole heat exchangers.

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Optimizing Heat Pump Systems with Dynamic Capacity Control

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  1. “Dynamic heat pump system with capacity control”Hatef MadaniDec. 2009

  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.

  3. Result example: Variable capacity vs. on/off controlled heat pump system Dynamic COP of both variable speed and on/off controlled GSHP

  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

  5. Examples of conclusions • Retrofitting a frequencyinverter to the on/offcontrolled heat pump to omit the electricalauxiliaryheater • Finding the optimum brinemassflowratedepending on the design objective (e.g. COP or heat capacitymaximization)

  6. List of publications • Internalreportcalled ”Capacitycontrol in heat pump systems:methods and strategies” wassubmitted in 2008. • The paper called “Variable capacity heat pump systems, modeling and simulation” was published in 9th 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.

  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 14th ASME international heat transfer conference, before Jan. 15th 2010. • A quantitatively evaluation of different techniques for capacity control and control strategies for heat pump systems.

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