Page 35 - Kỷ yếu hội thảo quốc tế: Ứng dụng công nghệ mới trong công trình xanh - lần thứ 9 (ATiGB 2024)

26 TRƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT - ĐẠI HỌC ĐÀ NẴNG

CALCULATION AND SIMULATION
OF THE THERMAL LOAD OF A VEHICLE AIR

CONDITIONING SYSTEM

5
6
1
Dang Tien Phuc , Ho Thanh Phong , Nhanh Van Nguyen , Nguyen Hay , Nguyen Thanh Tan , Pham Van Kien
2
4
3
1 Faculty of Automotive Engineering Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
2 Faculty of Automotive Mechanic,Bach Khoa Sai Gon College,Ho Chi Minh City, Vietnam
3 HUTECH Institute of Engineering, HUTECH University, Ho Chi Minh City, Vietnam
4 Faculty of Engineering and Technology,Nong Lam University,Ho Chi Minh City, Vietnam
5 Faculty of Automotive Engineering, School of Technology, Van Lang University, Ho Chi Minh City, Vietnam
6 Faculty of Automotive Engineering, School of Technology Van Lang University, Ho Chi Minh City, Vietnam
dangtienphuc@iuh.edu.vn; phong.ht@bkc.edu.vn; nv.nhanh@hutech.edu.vn; ng.hay@hcmuaf.edu.vn;
tan.nguyen@vlu.edu.vn; kien.pv@vlu.edu.vn
Abstract: The study focused on the calculation and 1634,19 W after 720 seconds. The heat exchanged with the
simulation of thermal loads applied to a vehicle cabin and air and the heat emitted from the engine had a negligible
required cooling capacity of the vehicle air conditioning effect, and they reached the nearly maximum value of
system. The programming on Matlab 2022 software was 100.81 W and 37.5 W after 720 seconds. Based on the
used for calculation and simulation of thermal loads and thermal loads, the cooling capacity of the air conditioning
cooling capacity. The results showed that radiation heat had system was determined with the value of 2890.87 W, this
the greatest influence with the value up to 2227.8 W. The was reasonable for the cooling capacity of a small size
heat emitted from humans had a negligible effect with the family car air conditioning system.
value of 317.08 W. The heat loss due to ventilation was Keywords: cooling capacity; total heat; cabin; vehicle;
quite large, and reached the nearly maximum value of - air conditioning system.
1. INTRODUCTION Zheng et al., studied the method of calculating the
Air conditioning system has the function of vehicle's thermal loads such as the radiation and
decreasing the temperature in the vehicle’s cabin in to ambient loads using the method of the cooling load
achieve a comfortable cooling temperarure. The air temperature differential (CLTD). In the thermal load
conditioning system applied for automobile has to be calculation, the vehicle’s geometry such as glass
strictly controlled to get the required temperature and surfaces, the angle of windshield and roof, and vehicle
humidity of internal air in cabin when the vehicle orientation were considered. The theory calculation
works in hot condition [1]. So, the calculation of results was very close to the experimental tested value
heating load and cooling capacity of the air [7]. The geometry of the vehicle includes glass
conditioning system was really important for design surfaces, windshield and hood angles, and vehicle
and improving the system, especially in energy orientation.
consumption because the air conditioning system of an Ding and Zito studied the cabin heat transfer of the
automobile can cause significant power reduction and vehicle based on the solving transient heat transfer
fuel consumption increase [2 – 4]. It is essential for differential equation analytically. The cabin heat
calculating the thermal load of the vehicle in order to transfer was determined by a first order differential
improve the vehicle fuel economy and operating equation that relates the cabin heat transfer coefficient.
efficiency of air conditioning system [5]. There were The solution to this heat transfer problem was the
some previous studies of calculation and simulation of basic for automobile air conditioning system designs
thermal load of automobile air conditioning system. and tests [8].
Jignesh et al., studied the calculating the thermal Arici et al., conducted the simulation of the
load of automobile air conditioning system. The dynamic operation of a climate control system of the
thermal load included the metabolic load, radiation vehicle. The problem of the temperature transition and
load, ambient load, exhaust and engine load, and the the relative humidity transition in cabin were solved
load generated due to ventilation. The Heat Balance based on the heat and mass transfer principles. The
Method (HBM) was used for determining the thermal simulation of the air conditioning system operation
load cooling capacity. The simulation of thermal load was conducted alongside the thermal load balance
was conducted based on the mathematical model of equations [9].
heat transfer phenomena, which presented the change Khayyam et al., carried out the calculating the
of thermal load during the operation of the air thermal loads for a vehicle based on a set of models.
conditioning system [6]. The results estimated the overall cooling load of the
vehicle air conditioning system which was used to
ISBN: 978-604-80-9779-0