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Performance evaluation of air-source heat pump based on a pressure drop embedded model
Tim Koopman1, Tingting Zhu1, Wilko Rohlfs1
1Department of Thermal and Fluid Engineering, Faculty of Engineering Technology (ET), University of Twente, 7522, NB, Enschede, the Netherlands.
Heliyon
|February 21, 2024
Summary
A new air-source heat pump model accurately simulates performance, including pressure drop. Results show ambient temperature significantly impacts the coefficient of performance (COP), with refrigerant choice affecting pressure dynamics.
Area of Science:
- Thermodynamics
- Energy Systems Engineering
- HVAC Technology
Background:
- Existing heat pump models often neglect pressure drop effects.
- Accurate simulation is crucial for optimizing energy efficiency in heating, ventilation, and air conditioning (HVAC) systems.
Purpose of the Study:
- To develop and validate an air-source heat pump simulation model incorporating evaporator and condenser pressure drop.
- To analyze the impact of ambient conditions and refrigerant type on heat pump performance.
Main Methods:
- An iterative simulation method was extended to include pressure drop calculations (frictional and acceleration).
- The model's coefficient of performance (COP) was computed for varying ambient temperatures and relative humidities.
- Simulation results were validated against experimental data from a reference heat pump.
Main Results:
- The model accurately predicted heat pump COP, with a slight underestimation of 1.5% compared to measured data.
- Ambient temperature significantly influences COP, with higher temperatures increasing performance and lower temperatures decreasing it.
- Refrigerant type (R410A, R32, R290) impacts pressure drop characteristics, with R32 showing the lowest overall pressure drop.
Conclusions:
- The developed model provides a more accurate representation of air-source heat pump performance by including pressure drop.
- Ambient temperature is a critical factor affecting heat pump efficiency, necessitating careful system design for diverse climates.
- Refrigerant selection plays a vital role in managing pressure drops and optimizing system performance.
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