{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T11:33:59Z","timestamp":1760441639070,"version":"build-2065373602"},"reference-count":31,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,7,27]],"date-time":"2020-07-27T00:00:00Z","timestamp":1595808000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>One of barriers for the present heat pump system\u2019s application in an electric vehicle was decreased performance under cold ambient conditions due to the lack of evaporating heat source. In order to improve the heat pump\u2019s performance, a high-pressure side chiller was additionally installed, and the tested heat pump system was modified with respect to refrigerant flow direction along with operating modes. In the present work, the performance characteristics of the heat pump system with a high-pressure side chiller for light-duty commercial electric vehicles were studied experimentally under hot and cold ambient conditions, reflecting real road driving. The high-pressure side chiller was located after the electric compressor so that the highest refrigerant temperature transferred the heat to the coolant. The controlled coolant with discharged refrigerant from the electric compressor was used to heat up the cabin, transferring heat to the inlet air like the internal combustion engine vehicle\u2019s heating system, except with unused engine waste heat. In the cooling mode, for the exterior air temperature of 35 \u00b0C and interior air temperature of 25 \u00b0C, cooling performance along with the compressor speed showed that the system efficiency decreased by 16.4% on average, the cooling capacity increased by 8.0% on average and the compressor work increased by 27% on average. In heating mode, at the exterior and interior air temperature of \u22126.7 \u00b0C, compressor speed and coolant temperature variation with steady conditions were tested with respect to heating performance. In transient mode, to increase coolant temperature with a closed loop from \u22126.7 \u00b0C, tested system characteristics were studied along the compressor speed with respect to heating up the cabin. As the inlet air of the HVAC was maintained at \u22126.7 \u00b0C, even though the heat-up rate of the cabin room was a little slow, the cabin temperature reached 20 \u00b0C within 50 min and the temperature difference with the ambient air attained 28.7 \u00b0C.<\/jats:p>","DOI":"10.3390\/sym12081237","type":"journal-article","created":{"date-parts":[[2020,7,30]],"date-time":"2020-07-30T12:15:38Z","timestamp":1596111338000},"page":"1237","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["A Study on Performance Characteristics of a Heat Pump System with High-Pressure Side Chiller for Light-Duty Commercial Electric Vehicles"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8857-4444","authenticated-orcid":false,"given":"Moo-Yeon","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Dong-A University, 37 Nakdong-Daero 550, Saha-gu, Busan 49315, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0893-0785","authenticated-orcid":false,"given":"Kunal Sandip","family":"Garud","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Dong-A University, 37 Nakdong-Daero 550, Saha-gu, Busan 49315, Korea"}]},{"given":"Han-Byeol","family":"Jeon","sequence":"additional","affiliation":[{"name":"Thermal Management R&amp;D Center, KATECH, 303 Pungse-ro, Pungse-Myun, Cheonan 31214, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6439-2213","authenticated-orcid":false,"given":"Ho-Seong","family":"Lee","sequence":"additional","affiliation":[{"name":"Thermal Management R&amp;D Center, KATECH, 303 Pungse-ro, Pungse-Myun, Cheonan 31214, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2020,7,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Lee, M.-Y., Seo, J.-H., Lee, H.-S., and Garud, K.S. (2020). Power generation, efficiency and thermal stress of thermoelectric module with leg geometry, material, segmentation and two-stage arrangement. Symmetry, 12.","DOI":"10.3390\/sym12050786"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1730003","DOI":"10.1142\/S2010132517300038","article-title":"A review of recent research on automotive HVAC systems for EVs","volume":"25","author":"Kang","year":"2017","journal-title":"Int. J. Air-Cond. Refrig."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"754","DOI":"10.1016\/j.rser.2014.07.038","article-title":"Advances on air conditioning and heat pump system in electric vehicles\u2013A review","volume":"38","author":"Qi","year":"2014","journal-title":"Renew. Sustain. Energy Rev."},{"key":"ref_4","unstructured":"Torregrosa, B., Pay\u00e1, J., and Corber\u00e1n, J.M. (2011, January 1\u20132). Modelling of mobile airconditioning systems for electric vehicles. Proceedings of the 4th European Workshop\u2014Mobile Air Conditioning and Vehicle Thermal Systems, Torino, Italy."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Zhang, Z., Li, W., Shi, J., and Chen, J. (2016). A study on electric vehicle heat pump systems in cold climates. Energies, 9.","DOI":"10.3390\/en9110881"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2085","DOI":"10.1016\/j.apenergy.2015.12.032","article-title":"Experimental investigation and theoretical analysis of heat pump systems with two different injection portholes compressors for electric vehicles","volume":"185","author":"Qin","year":"2017","journal-title":"Appl. Energy"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1490","DOI":"10.1016\/j.egypro.2015.07.281","article-title":"Experimental investigation on heat pump for electric vehicles with different refrigerant injection compressors","volume":"75","author":"Qin","year":"2015","journal-title":"Energy Procedia"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/j.enconman.2015.01.024","article-title":"Experimental investigation on heating performance of heat pump for electric vehicles at \u221220 \u00b0C ambient temperature","volume":"102","author":"Qin","year":"2015","journal-title":"Energy Convers. Manag."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"726","DOI":"10.1016\/j.egypro.2014.11.952","article-title":"Experimental investigation on heating performance of heat pump for electric vehicles in low ambient temperature","volume":"61","author":"Qin","year":"2014","journal-title":"Energy Procedia"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"677","DOI":"10.1016\/j.applthermaleng.2017.01.088","article-title":"Experimental study on combined defrosting performance of heat pump air conditioning system for pure electric vehicle in low temperature","volume":"116","author":"Zhou","year":"2017","journal-title":"Appl. Therm. Eng."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.apenergy.2013.12.065","article-title":"Heating performance characteristics of a dual source heat pump using air and waste heat in electric vehicles","volume":"119","author":"Ahn","year":"2014","journal-title":"Appl. Energy"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"800","DOI":"10.1016\/j.applthermaleng.2017.08.098","article-title":"Numerical study of the effects of injection-port design on the heating performance of an R134a heat pump with vapor injection used in electric vehicles","volume":"127","author":"Jung","year":"2017","journal-title":"Appl. Therm. Eng."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1016\/j.ijrefrig.2017.10.036","article-title":"Performance analysis of a heat pump system with integrated desiccant for electric vehicles","volume":"86","author":"Zhang","year":"2018","journal-title":"Int. J. Refrig."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1016\/j.ijrefrig.2017.04.026","article-title":"Performance analysis of vapor injection heat pump system for electric vehicle in cold startup condition","volume":"80","author":"Choi","year":"2017","journal-title":"Int. J. Refrig."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"660","DOI":"10.1016\/j.applthermaleng.2012.07.001","article-title":"Performance characteristics of mobile heat pump for a large passenger electric vehicle","volume":"50","author":"Lee","year":"2013","journal-title":"Appl. Therm. Eng."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"138","DOI":"10.1016\/j.ijrefrig.2016.10.004","article-title":"Performance evaluation of a vapor injection heat pump system for electric vehicles","volume":"74","author":"Kwon","year":"2017","journal-title":"Int. J. Refrig."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1016\/j.ijrefrig.2018.08.020","article-title":"Performance evaluation of propane heat pump system for electric vehicle in cold climate","volume":"95","author":"Liu","year":"2018","journal-title":"Int. J. Refrig."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1016\/j.ijrefrig.2020.02.021","article-title":"Performance evaluation of R1234yf heat pump system for an electric vehicle in cold climate","volume":"115","author":"Li","year":"2020","journal-title":"Int. J. Refrig."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1016\/j.energy.2016.08.104","article-title":"Performance improvement of a dehumidifying heat pump using an additional waste heat source in electric vehicles with low occupancy","volume":"115","author":"Ahn","year":"2016","journal-title":"Energy"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"290","DOI":"10.1016\/j.applthermaleng.2017.10.020","article-title":"Reversible heat pump HVAC system with regenerative heat exchanger for electric vehicles: Analysis of its impact on driving range","volume":"129","author":"Bellocchi","year":"2018","journal-title":"Appl. Therm. Eng."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"232","DOI":"10.1016\/j.ijrefrig.2016.06.021","article-title":"Steady state and start-up performance characteristics of air source heat pump for cabin heating in an electric passenger vehicle","volume":"69","author":"Lee","year":"2016","journal-title":"Int. J. Refrig."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1016\/j.ijrefrig.2017.03.004","article-title":"Using an air cycle heat pump system with a turbocharger to supply heating for full electric vehicles","volume":"77","author":"Li","year":"2017","journal-title":"Int. J. Refrig."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"658","DOI":"10.3390\/en5030658","article-title":"Measurement and evaluation of heating performance of heat pump systems using wasted heat from electric devices for an electric bus","volume":"5","author":"Cho","year":"2012","journal-title":"Energies"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1371","DOI":"10.3390\/en5051371","article-title":"Characteristic evaluation on the cooling performance of an electrical air conditioning system using R744 for a fuel cell electric vehicle","volume":"5","author":"Lee","year":"2012","journal-title":"Energies"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2065","DOI":"10.1007\/s12206-012-0516-2","article-title":"Heating performance characteristics of stack coolant source heat pump using R744 for fuel cell electric vehicles","volume":"26","author":"Lee","year":"2012","journal-title":"J. Mech. Sci. Technol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1650006","DOI":"10.1142\/S2010132516500061","article-title":"Study on economized vapor injection heat pump system using refrigerant R32","volume":"24","author":"Shi","year":"2016","journal-title":"Int. J. Air-Cond. Refrig."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1007\/s10973-018-7762-1","article-title":"Performance analysis of a double-pass solar air heater system with asymmetric channel flow passages","volume":"136","author":"Raj","year":"2019","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"116697","DOI":"10.1016\/j.energy.2019.116697","article-title":"Drying of untreated Musa nendra and Momordica charantia in a forced convection solar cabinet dryer with thermal storage","volume":"192","author":"Arun","year":"2020","journal-title":"Energy"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Garud, K.S., Seo, J.H., Cho, C.P., and Lee, M.Y. (2020). Artificial Neural Network and Adaptive Neuro-Fuzzy Interface System Modelling to Predict Thermal Performances of Thermoelectric Generator for Waste Heat Recovery. Symmetry, 12.","DOI":"10.3390\/sym12020259"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Garud, K.S., Seo, J.H., Patil, M.S., Bang, Y.M., Pyo, Y.D., Cho, C.P., and Lee, M.Y. (2020). Thermal\u2013electrical\u2013structural performances of hot heat exchanger with different internal fins of thermoelectric generator for low power generation application. J. Therm. Anal. Calorim., 1\u201333.","DOI":"10.1007\/s10973-020-09553-7"},{"key":"ref_31","first-page":"285","article-title":"The Effect of Compressor Speed Variation and Vapor Injection on the Performance of Modified Refrigeration System","volume":"12","author":"Hamad","year":"2018","journal-title":"Int. Rev. Mech. Eng. IREME"}],"container-title":["Symmetry"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-8994\/12\/8\/1237\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:52:07Z","timestamp":1760176327000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-8994\/12\/8\/1237"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,7,27]]},"references-count":31,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2020,8]]}},"alternative-id":["sym12081237"],"URL":"https:\/\/doi.org\/10.3390\/sym12081237","relation":{},"ISSN":["2073-8994"],"issn-type":[{"type":"electronic","value":"2073-8994"}],"subject":[],"published":{"date-parts":[[2020,7,27]]}}}