Experimental investigation on the thermal performance of a qanat-source heat pump

Delfani, Shahram; Esmaeelian, Jafar; Karami, Maryam

doi:10.1016/j.geothermics.2020.101933

Cited by 8 publications

(11 citation statements)

References 18 publications

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“…Figure 7 indicates the required thermal loads of the test room. 23 As can be seen, the experimental and numerical results were in good agreement; so that, the MAPE and maximum error are 3.7% and 10.33%, respectively. Figure 8 shows a comparison between the EER of the QSHP, which is calculated using the numerical and experimental data in the warm months.…”

Section: Model Validationmentioning

confidence: 53%

“…T qw is the qanat water temperature, which is obtained from the experimental study by Delfani et al 23 and the volume flow rate of qanat is considered 300 l/min. The convective heat transfer coefficient of the qanat water (h qw) is determined by using the following equations 27 :…”

Section: Hche Modelingmentioning

confidence: 99%

“…The high side temperature of the condenser is considered the average temperature of the refrigerant throughout the condenser. 30 The heat transfer in the evaporator and condenser was then calculated by combining equations (21)(22)(23) and (25)(26).…”

Section: Heat Pump Modelingmentioning

confidence: 99%

“…In this study, for the first time, the thermal performance of the QSHP is numerically evaluated using a TRNSYS-MATLAB co-simulator. After validating the model using the experimental results, 23 the monthly variation of the COP, the EER, and the free energy ratio (FER) of the QSHP is also investigated and compared with an ASHP. Furthermore, the exergy analysis of the 21 QSHP is numerically studied which has not been performed to date, to the best of the author's knowledge.…”

Section: Introductionmentioning

confidence: 99%

“…The first study on the qanat source heat pumps (QSHP) was done experimentally by Delfani et al 23 They were designed and installed a test site in Road, Housing and Urban Development Research Center in Tehran, Iran, and compared the performance characteristics of the QSHP with an ASHP under the same operating conditions. The results showed that the COP and the energy efficiency ratio (EER) of the QSHP were very stable during the year by variation of 1.5% and 1.8% in cooling mode, respectively, while the COP and EER of the ASHP fluctuated 9% and 6%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Energy and exergy analysis of the transient performance of a qanat-source heat pump using TRNSYS-MATLAB co-simulator

Karami

Abdshahi

2022

Energy & Environment

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In this study, the transient performance of a qanat source heat pump is investigated using a TRNSYS-MATLAB co-simulator. The water/ethylene glycol-to-air compression heat pump and the helical coil heat exchanger, which is used to inject heat to or to extract heat from the qanat water, are mathematically modeled in matrix laboratory (MATLAB), and then, coupled to transient systems simulation (TRNSYS) model to evaluate the system transient performance and calculate the heating and cooling loads of the case study building. Comparison of the performance of the qanat source heat pump with an air source heat pump showed that the coefficient of performance of the qanat source heat pump is at least 5% and at most 34% higher than that of the air source heat pump. By increasing the flow rate of the working fluid in the helical coil heat exchanger from 2 L/min to 8 L/min, the coefficient of performance of the qanat source heat pump increases at least 12% and at most 34.1%. The maximum increase in energy efficiency ratio and free energy ratio of the system by the similar increase in the flow rate is 46.4% and 24.8%, respectively. The exergy analysis of the qanat source heat pump reveals that the minimum and maximum exergy efficiency of the system is 32% and 85.5%, respectively. The findings also indicate that the most exergy destruction occurs in the condenser in heating mode and in the evaporator in cooling mode.

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Section: Model Validationmentioning

confidence: 53%

Section: Hche Modelingmentioning

confidence: 99%