Solar air conditioning system for automobiles based on thermoelectric refrigeration

doi:10.19799/j.cnki.2095-4239.2020.0031

Abstract

Abstract:

In this study, a solar air conditioning system for automobiles is experimentally investigated based on thermoelectric refrigeration. The proposed system can achieve independent power supply and regulate the temperature in a simulated compartment space. The system includes a solar panel, lithium batteries, and other energy supply devices as well as the air conditioning and refrigeration systems containing semiconductor thermoelectric chips. The batteries comprise 1 × 4 prismatic lithium iron phosphate batteries connected in series. The size of the simulation box is 400 mm× 400 mm× 400 mm, and six temperature sensors are placed in the box to measure the air temperature. The thermocouples and heat flow meters are installed on the side wall to measure the wall temperature and heat flow through the wall. Subsequently, an experiment is conducted to examine the solar air conditioner’s performance in case of TECs connected in series or parallel. Subsequently, the cooling curves are obtained, the heat flow across the side wall is measured, and the refrigeration coefficient is calculated for both the connections. Results show that when cooling is performed at the ambient temperature of 27 C for 30 min, the average temperature in the closed box can reduce to 18.3 °C. In a series connection, he average refrigeration coefficient is 1.03 and the effective refrigeration coefficient is 0.79 (excluding the heat flow on the side wall). In a parallel connection, the average temperature reduces to 16.7 °C and the average refrigeration coefficient and effective refrigeration coefficients are 0.38 and 0.28 (excluding wall heat flow), respectively.

Key words: solar air conditioner, thermoelectric cooler, heat flow across wall, refrigeration coefficient, series connection

CLC Number:

TK 511

LOU Fang, ZHANG Hengyun, XIE Daochang, LIU Junliang, MAO Dewen, SUN Qifu, LI Yuanjie. Solar air conditioning system for automobiles based on thermoelectric refrigeration[J]. Energy Storage Science and Technology, 2020, 9(4): 1178-1185.

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参数	尺寸	材料或规格
箱体尺寸	400 mm×400 mm×400 mm	亚克力
TEC热端散热器	210 mm×120 mm×34 mm	铝制
TEC冷端散热器	150 mm×78 mm×26 mm	铝制
太阳能电池板	1200 mm×540 mm×30 mm	单晶硅
热流计	20 mm×30 mm×0.1 mm	日置

参数	规格
外形尺寸	40 mm×40 mm×40 mm，±0.1 mm 热电臂对数：127
内部阻值	1.2～1.5 Ω
工作电流	I _max：10 A
额定电压	DC12V（V _max：15.5 V）
制冷功率	Q _cmax: 92 W
工作环境	温度范围：-55～83°C

参数	规格
标称容量/A·h	20
额定电压/V	3.2
充电限制电压/V	3.65
放电截至电压/V	2.5
最大放电电流/A	60
外形尺寸/mm	28×149×92