Abstract
The objective of this study is to investigate heating performance characteristics of a coolant source heat pump using the wasted heat from electric devices for an electric bus. The heat pump, using R-134a, is designed for heating a passengers’ compartment by using discharged energy from the coolant of electric devices, such as motors and inverters of the electric bus. The heating performance of the heat pump was tested by varying the operating parameters, such as outdoor temperature and volume flow rate of the coolant water of the electrical devices. Heating capacity, compressor work, and heating COP were measured; their behaviors with regard to the parameters were observed. Experimental results showed that heating COP increased with decrease of outdoor temperature, from 20.0 °C to 0 °C, and it observed to be 3.0 in the case of 0 °C outdoor temperature. The observed characteristics of the heating COP suggest that the heat pump is applicable as the cabin heater of an electric vehicle, which is limited by short driving range.
Highlights
In recent years, concerns have been focused on the international issues of shocking oil price increases, considering the depletion of fossil fuel energy that has resulted from industrialization.consumption of fossil fuel energy leads to environmental pollution, including air pollution, acid rain, global warming due to the carbon dioxide, and destruction of the ozone layer
Lee et al [7], the refrigerant charge of the heat pump for heating was set to 8,500 g at an indoor temperature of 10.0 °C, water flow rate for the condenser of 0.020 m3/min, and water flow rate for the evaporator of 0.040 m3/min
The observed characteristics of the heating COP and heating capacity, with variation in operating conditions, suggest that the heat pump designed in this study is applicable to the cabin heater of an electric bus, which is limited by short driving range
Summary
Concerns have been focused on the international issues of shocking oil price increases, considering the depletion of fossil fuel energy that has resulted from industrialization.consumption of fossil fuel energy leads to environmental pollution, including air pollution, acid rain, global warming due to the carbon dioxide, and destruction of the ozone layer. The increase in automobile usage makes these problems even more severe Considering this situation, studies on effective use of energy and exploration of how to produce less exhaust gas in automobiles become necessary. Automobile manufacturers are looking for alternatives, like hybrid vehicles, fuel cell electric vehicles, and electric vehicles. In these vehicles, the passenger cabin heating has a considerable impact on fuel economy, especially during the waiting periods, as does cooling. In heating conditions for passengers in alternative vehicles, without internal combustion engines, the heat pump uses discharged energy from electric devices such as a motor, a battery, or an inverter of the electric vehicle; these are possibilities for shorter heating warm-up. The heat pump has the advantage of providing heating to the vehicle without an international combustion engine
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