Share:


Operation analysis of the air-source heat pump using TRNSYS simulation tool

Abstract

In order to achieve ambitious goals for energy efficiency and requirements for near zero energy buildings, various technological solutions enabling the use of renewable energy are proposed and applied. One such rapidly spreading technology is heat pumps. However, the use of air-­to-­water heat pumps in countries where the cold season is cold and humid has unfavourable conditions for the operation of this equipment during the heating season. As a result, the performance efficiency of the equipment decreases. This article presents the simulation results of an air-­to-­water heat pump operation in Lithuania using the TRNSYS modelling tool; its nominal heating capacity is 6.55 kW. The model was calibrated using real data obtained at Vilnius Gediminas Technical University when measurements were performed under heat pump freezing conditions. The seasonal performance factor of the heat pump heating mode was determined during the calculation. Parametric analysis of the model was also performed, when sensitivity of the model to the initial climatic data was observed. Comparable results are obtained for Vilnius, Prague and London.


Article in Lithuanian.


Šilumos siurblio oras–vanduo veikimo tyrimas taikant TRNSYS modeliavimo priemonę


Santrauka


Siekiant ambicingų energijos efektyvumo ir beveik energijos nevartojantiems pastatams keliamų reikalavimų ir tikslų, įvairūs technologiniai sprendimai, įgalinantys atsinaujinančiosios energijos vartojimą, siūlomi bei taikomi. Viena tokių sparčiai plintančių technologijų – šilumos siurbliai. Tačiau taikant šilumos siurblius oras–vanduo šalyse, kur šaltasis sezonas šaltas ir drėgnas, susiduriama su nepalankiomis sąlygomis šiai įrangai veikti šildymo sezono metu. Dėl šios priežasties įrangos veikimo efektyvumas mažėja. Šiame straipsnyje pristatomi šilumos siurblio oras–vanduo, kurio nominalioji šildymo galia 6,55 kW, veikimo analizės rezultatai Lietuvos klimato sąlygomis taikant TRNSYS modeliavimo priemonę. Darbui taikytas skaitinis modelis buvo kalibruotas naudojant realius duomenis, gautus Vilniaus Gedimino technikos universitete, kai eksperimentiniai matavimai atlikti esant šilumos siurblio užšalimo sąlygoms. Skaičiavimų metu nustatomas šilumos siurblio šildymo režimo efektyvumas. Modeliuojant taip pat atlikta modelio parametrinė analizė, kai stebima, kiek pradiniai klimato duomenys turi įtakos modelio rezultatams. Lyginami Vilniaus, Prahos ir Londono miestų klimato sąlygas atitinkantys modeliavimo rezultatai.


Reikšminiai žodžiai: eksperimentas, modeliavimas, šilumos siurblys oras–vanduo, sezoninis veiksmingumo koeficientas (SPF), šildymo sezonas, šilumos siurblio efektyvumas (COP), TRNSYS.

Keyword : experiment, simulation, air­-source heat pump, seasonal performance factor (SPF), heating season, coefficient of performance (COP), TRNSYS

How to Cite
Daugirdaitė, G., Streckienė, G., & Kropas, T. (2021). Operation analysis of the air-source heat pump using TRNSYS simulation tool. Mokslas – Lietuvos Ateitis / Science – Future of Lithuania, 13. https://doi.org/10.3846/mla.2021.15266
Published in Issue
Sep 27, 2021
Abstract Views
124
PDF Downloads
40
Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

References

Amirirad, Kumar, R., & Fung, A. (2017, November 15–16). Performance prediction of an air source heat pump water heater in Canadian conditions. In AIRAH and IBPSA’s Australasian Building Simulation 2017 Conference (pp. 1–9), Melbourne.

Chargui, R., & Sammouda, H. (2014). Modeling of a residential house coupled with a dual source heat pump using TRNSYS software. Energy Conversion and Management, 81, 384–399. https://doi.org/10.1016/j.enconman.2014.02.040

Daugirdaitė, G., Streckienė, G. ir Kropas, T. (2021). Oro šaltinio šilumos siurblio veikimo parametrų tyrimas susidarant šerkšnui ant jo garintuvo. Iš 24-osios Lietuvos jaunųjų mokslininkų konferencijos „Mokslas – Lietuvos ateitis“ teminė konferencija „Pastatų energetika“ (pp. 11–17), Vilniaus Gedimino technikos universitetas. https://doi.org/10.3846/pinzs.2021.02

Dongellini, M., Naldi, C., & Morini, G. L. (2015). Seasonal performance evaluation of electric air-­to-­water heat pump systems. Applied Thermal Engineering, 90, 1072–1081. https://doi.org/10.1016/j.applthermaleng.2015.03.026

Januševičius, K., Streckienė, G., Bielskus, J., & Martinaitis, V. (2016). Validation of unglazed transpired solar collector assisted air source heat pump simulation model. Energy Procedia, 95, 167–174. https://doi.org/10.1016/j.egypro.2016.09.039

Januševičius, K., & Streckienė, G. (2015). Analysis of air-­to-­water heat pump in cold climate: comparison between experiment and simulation. Mokslas – Lietuvos ateitis, 7(4), 468–474. https://doi.org/10.3846/mla.2015.823

Kamel, R. S., & Fung, A. S. (2014). Modeling, simulation and feasibility analysis of residential BIPV/T+ASHP system in cold climate–Canada. Energy and Buildings, 82, 758–770. https://doi.org/10.1016/j.enbuild.2014.07.081

Lee, Y. B., & Ro, S. T. (2002). Frost formation on a vertical plate in simultaneously developing flow. Experimental Thermal and Fluid Science, 26(8), 939–945. https://doi.org/10.1016/S0894-1777(02)00216-9

Ling, J., Tong, H., Xing, J., & Zhao, Y. (2020). Simulation and optimization of the operation strategy of ASHP heating system: A case study in Tianjin. Energy and Buildings, 226, 110349. https://doi.org/10.1016/j.enbuild.2020.110349

Nawaz, K., Elatar, A., & Fricke, B. (2018). A critical literature review of defrost technologies for heat pumps and refrigeration systems. US Department of Energy (DOE). https://doi.org/10.2172/1474464

St­-Onge, G., Kummert, M., & Kegel, M. (2018, May 9–10). Variable capacity mini­split air source heat pump model for TRNSYS. In Proceedings of ESIM 2018, the 10th Conference of IBPSA Canada (pp. 40–49), Montreal (QC), Canada.

Wang, Z., Song, M., Wang, F., Ma, Z., & Lin, Q. (2018). Experimental investigation and seasonal performance assessment of a frost-­free ASHP system with radiant floor heating. Energy and Buildings, 179, 200–212. https://doi.org/10.1016/j.enbuild.2018.09.019

Wu, Y., Wang, W., Sun, Y., Cui, Y., Lin, Y., & Deng, S. (2021). Development of evaluation indexes for assessing the regional operating performances of air source heat pump (ASHP) units operated in different climate regions based on the equivalent temperature drop method. Energy and Buildings, 247, 111111. https://doi.org/10.1016/j.enbuild.2021.111111

Zhu, J. H., Sun, Y. Y., Wang, W., Deng, S. M., Ge, Y. J., & Li, L. T. (2015). Developing a new frosting map to guide defrosting control for air-­source heat pump units. Applied Thermal Engineering, 90, 782–791. https://doi.org/10.1016/j.applthermaleng.2015.06.076