You-Ma Bang

Experimental Study on the Heating Performances of the Air Heater with Diesel for Passenger Cabin Heating of an Electric Vehicle

The objective of this study is to experimentally investigate the heating performances of the portable air combustion heater using diesel fuel for auxiliary cabin heating of the battery electric vehicle. In order to evaluate the heating performances of the air combustion heater, the heating capacity was calculated by the temperature at inlet and outlet parts of the considered heater and the inner temperature distribution characteristics of the vehicle were measured during 1600 seconds with an interval of 1 second. The theoretical efficiency of the tested heater was calculated by temperature data of the air of supplying and exhausting to the cabin. As the air passed the heat-sink, the air temperature at the end of heat-sink reached to 101.3 o C and the difference of temperature on heat-sink was 67.8%. The average heating capacity of the air combustion heater showed 2.0 kW. After 1800 seconds, the inner temperature of the vehicle cabin was continuously increased. The temperatures of the top side and the bottom side of the car cabin under consideration were increased upto 42.5 o C and 24.3 o C, respectively, and the theoretical efficiency of the tested heater was on average 63.7%.

Investigation on the Performance of Special Purpose Automotive Air-Conditioning System Using Dual Refrigeration Cycle

C로 증가할수록 냉방용량은 19.1 kW에서 20.5 kW로 7.3% 증가했으나 냉방성능(COP)는 4.67에서 5.1로 7.0%감소하였다. Abstract: The objective of this study is to investigate the cooling performance of an air-conditioning system for a special purpose vehicle under tropical and severe weather conditions. In order to evaluate and compare the cooling performances, the dual refrigeration cycle using R-134a was tested on a special purpose vehicle with various refrigerant charge amounts and indoor temperatures. The cycle was tested considering indoor cooling speed and compression ratio (discharge pressure), and was optimized at the refrigerant charge amount of 1.5 kg and outdoor temperature of 40.0 °C. The time to reach indoor temperature of 15.0 °C increased by 86.5％ and 38.1％, at the indoor temperatures from 25.0 °C to 32.5 °C and from 32.5 °C to 40.0 °C, respectively. In addition, with the increase in indoor temperature from 25.0 °C to 40.0 °C, the cooling capacity increased by 7.3％, from 19.1 kW to 20.5 kW, but decreased by 7.0％ from 4.67 to 5.1.

Numerical Study on Thermal Performances of Multi Heat Source Heating System Using Butane for Electric Vehicle

This study numerically investigates the thermal performance of a 2.0-kW butane-based combustion heating system for an electric vehicle under cold conditions. The system is used for cabin space heating and coolant-based battery thermal management. ANSYS CFX 17 software was used for parametric analysis. The mass flow rates of cold air and coolant were varied, and their effects were compared. The numerical results were validated with theoretical studies, which showed an error of 0.15%. As the outside air mass flow rates were increased to 0.005, 0.01, and 0.015 kg/s, the cabin supply air temperature decreased continuously while the coolant outlet temperature increased. When the coolant mass flow rates were increased to 0.005, 0.01 and 0.015 kg/s, the air temperature increased while the coolant outlet temperatures decreased. The optimal mass flow rates are discussed in a consideration of the requirements for high cabin heating capacity and efficient battery thermal management.

Experimental Investigation of Heat Transfer Characteristics of Battery Management System and Electronic Control Unit of Neighborhood Electric Vehicle

The increased need for mobility has necessitated a tremendous growth in transportation industry. The consumption of oil has increased many-fold leading to rapid deterioration of fossil fuel resources and increased greenhouse gas emissions. This has led to the finding alternative source of energy for vehicles in terms of battery based electric vehicles. Although electric vehicles are promising option for transportation, many issues like specific power, cost, vehicle range, battery thermal management etc. needs to be resolved efficiently in order to compete with internal combustion engine based vehicles. In this paper, an experimental study has been carried out to investigate the heat transfer characteristics of battery thermal management system and electronic control unit of neighborhood electric vehicle. The temperatures are measured at critical locations with varying velocity and varying altitude.

Experimental and Numerical Study on the Thermal Performances of Battery Cell and ECU for an E-Bike

In recent years, the traffic congestion, energy issues and environmental problems are occurred by increase in motor vehicles as well as population. The short and long range electrically operated vehicles like EVs (Electric vehicles) and LEVs (Light Electric vehicles) have been receiving much attention as a way to resolve these problems. Among these electric vehicle types, electric bicycle and electric scooters have the important components such as battery cell and ECUs (Electric Control Units). The component temperature is increased due to the heat generated by the continuous operation, which leads to decrease of the life cycle and performance. An experimental study was conducted to observe the effects of cooling performance of battery cell and heatsink case for ECU. Subsequently a numerical model was developed and cooling performance results of numerical study were validated by comparing it with experimental study. A new model is proposed with enhanced thermal performance for ECU heatsink.

Study on Cooling System Characteristics of 400W Active Speaker

The objective of this study is to experimentally investigate the cooling performance characteristics with the consideration of the temperature variations of the enclosure of the 400W ferrofluid active speaker having both woofer and amplifier heat sinks. In order to do this, the heat sinks for both woofer and amplifier was designed ant applied to 400W ferrofluid active speaker. As a result, the cooling performance of the developed 400W ferrofluid active speaker was improved and the temperature of the enclosure after 120 min at steady state increased by with the increase of the outdoor temperatures from to . In addition, the overall sound pressure level of the developed 400W ferrofluid active speaker showed 111.8 dB and improved 1.9 dB higher than 109.9 dB of the existed speaker.