THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Mehmet Özdemir

,

Ayhan Onat

OPTIMIZATION OF THE FAN COIL COOLING SYSTEM AND THE AIR SOURCE HEAT PUMP USING A MODERATED MEDIATION MODEL

ABSTRACT
The data obtained from a heating and cooling system comprised of a fan coil unit integrated air source heat pump used in Istanbul, Turkey, as well as data on outdoor conditions, was analyzed in this study. The analysis was carried out with the help of the moderated mediation model, which is included as a process analysis in the “Statistical Package for the Social Sciences” application. In this study, a mathematical model of the moderated mediation model was created and the efficiency coefficients of the parameters effecting performance were calculated. It was discovered that the effect of medium and high relative humidity values on the outdoor temperature was about 4.81%. The heat pump fails to transmit heat to the environment outside as a result of medium and high relative humidity values increasing the outdoor temperature. As a result of this it has been found that relative humidity values have a negative effect on the water temperature entering the fan coil unit by approximately -1.18%. This result of the study shows that the outlet water temperature of the fan coil unit does not adequately cool the rooms in the summer. It has been discovered that while wind velocity negatively affects performance affecting parameters, low relative humidity values have no effect on them.
PAPER SUBMITTED: 2023-08-10
PAPER REVISED: 2023-10-09
PAPER ACCEPTED: 2023-10-16
PUBLISHED ONLINE: 2023-11-11
DOI REFERENCE: https://doi.org/10.2298/TSCI230810241O
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 2, PAGES [1561 - 1576]
REFERENCES
  1. ***, United Nations Departman of Economic and Social Affairs Wold Population Prospects 2022. Available, online: www.un.org/development/desa/pd/sites/www.un.org development.desa.pd/files/wpp2022_summary_of_results.pdf (30.05.2023)
  2. ***, United Nations Departman of Economic and Social Affairs Wold Population Prospects 2019 Available online: population.un.org/wpp/publications/files/wpp2019_highlights.pdf (30.05.2023)
  3. Bai, T., et al., Theoretical Performance Analysis of an Ejector Enhanced High-Temperature Heat Pump with Dual-Pressure Condensation and Evaporation, J. of Thermal Science, 31 (2022), Aug., pp. 1367-1379
  4. ***, International Energy Agency Source IEA World Energy Outlook, 2022, iea.blob.core.windows.net/assets/7e42db90-d8ea-459d-be1e-1256acd11330/WorldEnergyOutlook2022.pdf
  5. Li, J., et al., Technical and Economic Performance Analysis of Large Flat Plate Solar Collector Coupled Air Source Heat Pump Heating System, Energy and Buildings, 277 (2022), 112564
  6. Irshad, A. S., et al., Evaluating the Effects of Passive Cooling and Heating Techniques on Building Energy Consumption in Kandahar Using CLTD Method, Materials Today: Proceedings, 57 (2022), Part 2, pp. 595-602
  7. Wang, J., et al., Energy Analysis and Optimization for a Solar-Driven Heating and Cooling System Integrated with Air Source Heat Pump in the Ultra-Low Energy Building, Journal of Building Engineering, 63 (2023), 105467
  8. Espenson, T. Heat Pumps: Performance and Applications. Energy Science, Engineering and Technology Series, New York, USA, 2018, pp. 1-32
  9. Alberizzi, J. C., et al., Optimal Day-ahead Scheduling of Heat Pump Heating Systems Partially Fed by Renewable Generation. Proceedings, 11th International Conference on Power Science and Engineering (ICPSE), Eskisehir, Turkey, 2022, pp. 72-78
  10. Sun, Z., et al., Experimental Study on the Application of Air-Source Heat Pump in a Warm-Temperate Extreme-Arid-Desert Climate Zone, Case Studies in Thermal Engineering, 42 (2023), 102723
  11. Ma, L., et al., Effects of Coupled Accumulator with Gas-Liquid Separator on an Air Source Heat Pump, Proceedings, Power System and Green Energy Conference (PSGEC), Shanghai, China, 2022, pp. 480-485
  12. Jiachao, H., et al., The Performance Experiment of an Air-Source Heat Pump with Multi-Stage Waste Heat Recovery, Proceedings, Power System and Green Energy Conference (PSGEC), Shanghai, China, 2022, pp. 486-490
  13. Dogan, A., et al., An Experimental Comparison of Radiant Wall and Ceiling Cooling System Integrated with Ground Source Heat Pump and Direct Expansion Fan Coil System in a Highly Glazed Office Room, Energy and Buildings, 273 (2022), 112412
  14. Gao, J., et al., Ventilation System Type and the Resulting Classroom Temperature and Air Quality During Heating Season, Springer, Berlin Heidelberg, 2014, Vol. 26, pp 203-214
  15. Lin, C.M., et al., Heating, Ventilation, and Air Conditioning System Optimization Control Strategy Involving Fan Coil Unit Temperature Control, Applied Sciences, 9 (2019), 11, 2391
  16. Zhu, X., et al., Experimental Study on the Operating Characteristic of a Combined Radiant Floor and Fan Coil Heating System: A Case Study in a Cold Climate Zone, Energy and Buildings, 291 (2023), 113087
  17. Cetin, K. S., et al., Development and Validation of an HVAC On/Off Controller in EnergyPlus for Energy Simulation of Residential and Small Commercial Building, Energy and Buildings, 183 (2019), Jan., pp. 467-483
  18. ***, UNE-EN 15232:2018. Energy Performance of Buildings - Energy performance of buildings - Part 1: Impact of Building Automation. Controls and Building Management, 2018
  19. Obrist, M. D., et al., High-Temperature Heat Pumps in Climate Pathways for Selected Industry Sectors in Switzerland, Energy Policy, 173 (2023), 113383
  20. Ye, J., et al., Experimental Study on the Heating and Humidifying Performance of Fan Coil Units with Humidification Modules in Severe Cold Regions, Energy and Buildings, 276 (2022), 112500
  21. Bai, M., et al.,. Experimental and Numerical Studies of heat and Mass Transfer Performance and Design Optimization of Fan-Coil with High Supply Chilled Water Temperature in Air-Conditioning System, Sustainable Energy Technologies and Assessments, 45 (2021), 101209
  22. Saleem, A., et al., Modeling and Performance Evaluation of Heat Pump Water Heater Systems, Proceedings, 19th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE), Mexico City, Mexico, 2022, pp. 1-5
  23. Licharz, H., et al., Energy Efficiency of a Heat Pump System: Case Study in Two Pig Houses, Energies, 13 (2020), 3, 662
  24. Li, Z., et al., A Method for Sizing Air Source Heat Pump Considering the Joint Effect of Outdoor Air Temperature and Relative Humidity, Journal of Building Engineering, 65 (2023), 105815
  25. Song, Y., et al., Experimental Investigation on a Capillary Tube Based Transcritical CO2 Heat Pump System, Applied Thermal Engineering, 112 (2017), Feb., pp. 184-189
  26. Kocyigit, F. Performance Analysis of Cooling System with Horizontal Type Ground Source Heat Pump for Diyarbakir Conditions, European Journal of Technique (EJT), 10 (2020), 1, pp. 119-130
  27. Bai, J., et al., Experimental Study on High Temperature Heat Pump System with a Double Heat Source Cascade, Thermal Science, 27 (2023), 3A, pp. 1845-1853
  28. Milovančević, U. M., et al., Performance Analysis of System Heat Pump - Heat Recuperator Used for Air Treatment in process industry, Thermal Science, 20 (2016), 4, pp. 1345-1354
  29. Hernandez F. F., et al., Analysis of a HVAC Zoning Control System with an Air-To-Water Heat Pump and a Ducted Fan Coil Unit in Residential Buildings, Applied Thermal Engineering, 215 (2022), 118963
  30. Weitang, S., et al., Optimization and Exergy Analysis of Fan-Coil Units-Heat Pump Combined Heat Collection System, Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering, 38 (2022), 15, pp. 241-248
  31. Zhang, X., et al., Digital Finance, Industrial Structure, and Total Factor Energy Efficiency: A Study on Moderated Mediation Model with Resource Dependence, Sustainability, 14 (2022), 22, 14718
  32. Loaiza-Ramirez, J. P., et al., Who Prefers Renewable Energy? A Moderated Mediation Model Including Perceived Comfort and Consumers' Protected Values in Green Energy Adoption and Willingness to Pay a Premium, Energy Research & Social Science, 91 (2022), 102753
  33. Attia, A. H., et al., Fuzzy Logic Control of Air-Conditioning System in Residential Buildings, Alexandria Engineering Journal, 54 (2015), 3, pp. 395-403
  34. Edwards, K. D., et al.. Moderated Mediation Analysis: A Review and Application to School Climate Research, Practical Assessment, Research & Evaluation, 25 (2020), Aug., No. 5
  35. Hayes, F. A. et al., Introduction to Mediation, Moderation, and Conditional Process Analysis, 3rd ed., The Guilford Press, New York, USA, 2020, pp. 605-633
  36. Bush, J., et al.,. Low Outdoor Temperature Heat Pump Applications to Reduce Electric Resistance Second Stage Heat, ASHRAE Transactions, 118 (2012), 1, pp. 620-627
  37. O'Hegarty, R., et al., Air-To-Water Heat Pumps: Review and Analysis of the Performance Gap Between In-Use and Product Rated Performance, Renewable and Sustainable Energy Reviews, 155 (2022), 111887
  38. Ning, B., et al., A Novel Classification Scheme for Design and Control of Radiant System Based on Thermal Response Time, Energy and Buildings, 137 (2017), Feb., pp. 38-45
  39. Weitang, K. E., et al., Air and Water Flowrate Optimisation for a Fan Coil Unit in Heat Pump Systems, Proceedings, International High Performance Buildings Conference at Purdue, Purdue University, West Lafayette, Ind., USA, 2012, Vol. 3497, pp. 1-10
  40. Cvetkov, V. The Central Limit Theorem and the Measures of Central Tendency, Deutsche Internationale Zeitschrift Für Zeitgenössische Wissenschaft, 2023, 49, pp. 14-21, docs.lib.purdue.edu/cgi/view-content.cgi?article=1079&context=ihpbc
  41. Columb, M. O., et al., Statistical Analysis: Sample Size and Power Estimations, BJA Education, 16 (2016), 5, pp. 159-161
  42. Bera, A. K., et al., A New Characterization of the Normal Distribution and Test for Normality, Econometric Theory, 32 (2016), 5, pp. 1216-1252
  43. Tabachnick, B. G., et al., Using Multivariate Statistics, 6th ed., Harlow, Essex: Pearson Education, Pearson, Boston, Mass., USA, 2013, pp. 79-81
  44. Wright, D. B., et al., Problematic Standard Errors and Confidence Intervals for Skewness and Kurtosis, Behavior Research Methods, 43 (2011), 1, pp. 8-17
  45. Hayes, A. F., et al., Conditional Process Analysis: Concepts, Computation, and Advances in the Modeling of the Contingencies of Mechanisms, American Behavioral Scientist, 64 (2019), 1, pp. 19-54
  46. Rees, T., et al., Social Support Moderates the Relationship Between Stressors and Task Performance Through Self-Efficacy, Journal of Social and Clinical Psychology, 28 (2009), 2, pp. 244-263
  47. Hayes, A. F., et al., Regression-Based Statistical Mediation and Moderation Analysis in Clinical Research: Observations, Recommendations, and Implementation, Behaviour Research and Therapy, 98 (2017), Nov., pp. 39-57
  48. Bolin, H., et al., Introduction to Mediation, Moderation, and Conditional Process Analysis: A Regression-Based Approach, Journal of Educational Measurement, 51 (2013), Nov., pp. 335-337
  49. Casement, M. D., et al., Neural Reward Processing Mediates the Relationship Between Insomnia Symptoms and Depression in Adolescence, Sleep, 39 (2016), 2, pp. 439-447
  50. Fairchild, A. J., et al., A General Model for Testing Mediation and Moderation Effects, Prevention Science, 10 (2009), 2, pp. 87-99
  51. ***, Freemeteo, tr.freemeteo.com/havadurumu/istanbul/hourly-forecast/today/?gid=745044&language=turkish&country=turkey
  52. ***, Meteorological Data Information System of Fire And Water, mevbis.mgm.gov.tr/mevbis/ui/index.html#/Workspace
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Optimization of the fan coil cooling system and the air source heat pump using a moderated mediation model

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence