Performance evaluation of air-source heat pump based on a pressure drop embedded model
An air-source heat pump simulation model, accounting for evaporator and condenser pressure drop, has been developed. The model is capable of computing the heat pump's coefficient of performance (COP) under different ambient temperatures and relative humidities above frosting conditions. This re...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-02-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844024006650 |
| _version_ | 1797267798829826048 |
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| author | Tim Koopman Tingting Zhu Wilko Rohlfs |
| author_facet | Tim Koopman Tingting Zhu Wilko Rohlfs |
| author_sort | Tim Koopman |
| collection | DOAJ |
| description | An air-source heat pump simulation model, accounting for evaporator and condenser pressure drop, has been developed. The model is capable of computing the heat pump's coefficient of performance (COP) under different ambient temperatures and relative humidities above frosting conditions. This research extends an existing iterative simulation method that relies on the equalization of logarithmic mean temperature differences (LMTDs) calculated through two different approaches by adding a pressure drop simulation. Frictional and acceleration pressure drop is considered, computed iteratively. Simulation results for three different refrigerants, R410A, R32 and R290, are compared. The model's accuracy is validated by comparing simulated COP values with measured COP values from the reference heat pump datasheet. The model closely replicates the measured COP values above frosting conditions, with only a slight underestimation of approximately 1.5%. Results show a substantial impact of ambient temperature on the COP. For instance, an ambient temperature of 20 ◦C, compared to 7 ◦C, results in a COP increase of up to 35%, while an ambient temperature of −10 ◦C leads to a 26% reduction in COP. Relative humidity enhances the COP if air moisture condensation becomes possible. Higher condenser capacities negatively affect the COP. The study highlights the differences in pressure drop characteristics between the condenser and the evaporator for the modeled heat pump, with maximum pressure drops of 220 kPa and 50 kPa for the condenser and evaporator, respectively. Additionally, the choice of refrigerant significantly influences pressure drop, with R32 displaying the lowest pressure drop, R410A showing the highest condenser pressure drop, and R290 causing the highest evaporator pressure drop. |
| first_indexed | 2024-03-08T00:48:51Z |
| format | Article |
| id | doaj.art-48d2e862445441a790ffd55c3021d89a |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-04-25T01:22:19Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-48d2e862445441a790ffd55c3021d89a2024-03-09T09:25:12ZengElsevierHeliyon2405-84402024-02-01104e24634Performance evaluation of air-source heat pump based on a pressure drop embedded modelTim Koopman0Tingting Zhu1Wilko Rohlfs2Department of Thermal and Fluid Engineering, Faculty of Engineering Technology (ET), University of Twente, 7522, NB, Enschede, the NetherlandsCorresponding author.; Department of Thermal and Fluid Engineering, Faculty of Engineering Technology (ET), University of Twente, 7522, NB, Enschede, the NetherlandsDepartment of Thermal and Fluid Engineering, Faculty of Engineering Technology (ET), University of Twente, 7522, NB, Enschede, the NetherlandsAn air-source heat pump simulation model, accounting for evaporator and condenser pressure drop, has been developed. The model is capable of computing the heat pump's coefficient of performance (COP) under different ambient temperatures and relative humidities above frosting conditions. This research extends an existing iterative simulation method that relies on the equalization of logarithmic mean temperature differences (LMTDs) calculated through two different approaches by adding a pressure drop simulation. Frictional and acceleration pressure drop is considered, computed iteratively. Simulation results for three different refrigerants, R410A, R32 and R290, are compared. The model's accuracy is validated by comparing simulated COP values with measured COP values from the reference heat pump datasheet. The model closely replicates the measured COP values above frosting conditions, with only a slight underestimation of approximately 1.5%. Results show a substantial impact of ambient temperature on the COP. For instance, an ambient temperature of 20 ◦C, compared to 7 ◦C, results in a COP increase of up to 35%, while an ambient temperature of −10 ◦C leads to a 26% reduction in COP. Relative humidity enhances the COP if air moisture condensation becomes possible. Higher condenser capacities negatively affect the COP. The study highlights the differences in pressure drop characteristics between the condenser and the evaporator for the modeled heat pump, with maximum pressure drops of 220 kPa and 50 kPa for the condenser and evaporator, respectively. Additionally, the choice of refrigerant significantly influences pressure drop, with R32 displaying the lowest pressure drop, R410A showing the highest condenser pressure drop, and R290 causing the highest evaporator pressure drop.http://www.sciencedirect.com/science/article/pii/S2405844024006650Air-source heat pumpCoefficient of performancePressure dropLogarithmic mean temperature differenceAlgorithm optimization |
| spellingShingle | Tim Koopman Tingting Zhu Wilko Rohlfs Performance evaluation of air-source heat pump based on a pressure drop embedded model Heliyon Air-source heat pump Coefficient of performance Pressure drop Logarithmic mean temperature difference Algorithm optimization |
| title | Performance evaluation of air-source heat pump based on a pressure drop embedded model |
| title_full | Performance evaluation of air-source heat pump based on a pressure drop embedded model |
| title_fullStr | Performance evaluation of air-source heat pump based on a pressure drop embedded model |
| title_full_unstemmed | Performance evaluation of air-source heat pump based on a pressure drop embedded model |
| title_short | Performance evaluation of air-source heat pump based on a pressure drop embedded model |
| title_sort | performance evaluation of air source heat pump based on a pressure drop embedded model |
| topic | Air-source heat pump Coefficient of performance Pressure drop Logarithmic mean temperature difference Algorithm optimization |
| url | http://www.sciencedirect.com/science/article/pii/S2405844024006650 |
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