An Experimental Study on a Bus Air Conditioner to Determine its Conformity to Design and Comfort Conditions

Year 2017, , 1089 - 1101, 12.12.2016

Şaban Ünal

https://doi.org/10.18186/thermal.277288

Cited By: 6

Abstract

The air conditioning system
for a bus should be selected considering a number of parameters, including
passenger capacity, local climatic conditions, and fuel consumption. It is
possible to determine whether a selected air conditioning system provides
desired performance through testing. This study examines how to verify experimentally
whether a bus air conditioning system meets design and comfort requirements. An
experimental study was conducted on a prototype bus and was tested when driving
on the Adana-Ceyhan highway in Turkey. The internal and external temperatures, evaporator
inlet and outlet temperatures and relative humidity values were measured. Thermal
sensation values were calculated by using empirical correlations given
by ASHRAE. Furthermore, the instantaneous cooling load of the bus was obtained
according to the experimental data, and the results are compared with the calculated
cooling load of the bus by using the radiant time series method
provided by ASHRAE. With respect to the obtained results, the selected air
conditioning system conformed to design and comfort requirements.

Keywords

Refrigeration, HVAC applications, Special/actual topics in heat transfer and thermodynamics

References

• [1]. M. Hegar, M. Kolda, M. Kopecka, V. Rajtmajer, A. Ryska, Bus HVAC energy consumption test method based on HVAC unit behavior, International Journal of Refrigeration, 36 (2013) 1254-1262.
• [2]. Ç. Kutlu, Ş. Ünal, M.T. Erdinç, Thermodynamic analysis of bi-avaporater ejector refrigeration cycle using R744 as natural refrigerant, Journal of Thermal Engineering, 2(2) (2016), 735-740.
• [3]. P. Maina, Z. Huan, Effects of various parameters on the efficiency of a CO2 heat pump: A statistical approach, Journal of Thermal Engineering, 1(4) (2015), 263-278.
• [4]. ASHRAE Applications Handbook SI, American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc., Atlanta, GA, USA, (2003).
• [5]. B.T. Jaime, F. Bjurling, J.M. Corberan, F.D. Sciullo, J. Paya, Transient thermal model of a vehicle's cabin validated under variable ambient conditions, Applied Thermal Engineering, 75 (2015) 45-53.
• [6]. O. Solmaz, M. Ozgoren, M.H. Aksoy, Hourly cooling load prediction of a vehicle in the southern region of Turkey by Artificial Neural Network, Energy Conversion and Management, 82 (2014) 177–187.
• [7]. K.W. Mui, L.T. Wong, Cooling Load Calculations in Subtropical Climate, Building and Environment, 42 (2007) 2498-2504.
• [8]. M.K. Mansour, M.N. Musa, M.N.W. Hassan, K.M. Saqr, Development of novel strategy for multiple circuit, roof top bus air conditioning system in hot humid countries, Energy Conversion and Management, 49 (2008) 1455-1468.
• [9]. Ö. Kaynaklı, I. Horuz, An experimental analysis of automotive air conditioning system, Int.Comm. Heat Mass Transfer, 30 (2003) 273-284.
• [10]. O. Büyükalaca, T. Yılmaz, Ş. Ünal, E. Cihan, E. Hürdoğan, Calculation of cooling load of a bus using radiant time series (RTS) method, 6th International Advanced Technologies Symposium (IATS’11), Elazığ/Turkey, 16-18 May (2011) 227-230 (in Turkish).
• [11]. ASHRAE Fundamentals Handbook, American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc., Atlanta, GA, USA, (2001).
• [12]. ASHRAE Standard 55, Thermal environmental conditions for human occupancy, American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc., Atlanta, GA, USA, (2004).
• [13]. K.W. Shek, W.T. Chan, Combined comfort model of thermal comfort and air quality on buses in Hong Kong, The Science of the Total Environment, 9 (2008) 277-282.
• [14]. H. Zhang, L. Dai, G. Xu, Y. Li, W. Chen, W. Tao, Studies of air-flow and temperature fields inside a passenger compartment for improving thermal comfort and saving energy. Part I: Test/numerical model and validation, Applied Thermal Engineering, 29 (2009) 2022–2027.
• [15]. H. Zhang, L. Dai, G. Xu, Y. Li, W. Chen, W. Tao, Studies of air-flow and temperature fields inside a passenger compartment for improving thermal comfort and saving energy. Part II: Simulation results and discussion, Applied Thermal Engineering, 29 (2009) 2028–2036.
• [16]. A. Alahmer, A. Mayyas, A.A. Mayyas, M.A. Omar, D. Shan, Vehicular thermal comfort models; a comprehensive review, Applied Thermal Engineering, 31 (2011) 995-1002.
• [17]. A. Alahmer, M. Abdelhamid, M. Omar, Design for thermal sensation and comfort states in vehicles cabins, Applied Thermal Engineering, 36 (2012) 126-140.
• [18]. R. Guofeng, T. Feng, Y. Lin, The research of thermal design for vehicle controller based on simulation, Applied Thermal Engineering, 58 (2013) 420-429.
• [19]. D. Marcos, F.J. Pino, C. Bordons, J.J. Guerra, The development and validation of a thermal model for the cabin of a vehicle, Applied Thermal Engineering, 66 (2014) 646-656.
• [20]. T. Yılmaz, Ş. Ünal, E. Cihan, Computational analysis of moist air processes. Proceedings of the Third National Congress of Refrigeration and Air Conditioning, Adana/Turkey, (1994) 325-332 (in Turkish).
• [21]. ASHRAE Standard 62, Ventilation for acceptable indoor air quality, American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc., Atlanta, GA, USA, (2001).
• [22]. I. Lira, Evaluating the measurement uncertainty: Fundamentals and Practical Guidance. Taylor & Francis, 2002.
• [23]. R.J. Moffat, Describing the uncertainties in experimental results. Experimental Thermal and Fluid Science, 1 (1988) 3–17.