丹東黃?？蛙嚜毩⒉膳到y(tǒng)設計

丹東黃?？蛙嚜毩⒉膳到y(tǒng)設計,丹東黃海客車獨立采暖系統(tǒng)設計,丹東,黃海,客車,獨立,采暖系統(tǒng),設計 哈爾濱工業(yè)大學華德應用技術學院畢業(yè)設計 Abstract Preheater, with the rapid development of automobile industry evolved out of the product (hereinafter referred to as the heater is also known as the heater), in order to be able to cold start the engine under low temperature conditions, car heating, defrosting the windshield, reducing engine wear and reduce fuel consumption and increase engine efficiency and service life, resulting in the heater will. As the fuel jet atomization heater air mix with the full, complete combustion, thermal efficiency, less harmful emissions, so this study nebulizer heater designed to meet the heating needs of Dandong Huanghai Bus. For domestic use more YJP. Q series jet atomizing liquid fuel heater performance thoroughly research, mastered the basic work rules, and its corresponding improvement increase.According to market demand in existing technologies and products based on the YJP. Q-Series fuel heater were optimized design of the system size. Research found that: the length of the combustion tube in a certain range the longer the heater thermal power, thermal efficiency is higher; and small tube in a certain length within the length of the shorter heater thermal power, thermal efficiency is higher; there is a best size conical cover so that the heater thermal power, thermal efficiency up to; combustion tube and small tube of double-chamber design has played a very good to prevent heat loss by thermal radiation to the role; Most liquid-type fuel heaters are used spiral water chamber heat exchanger, heat exchanger for heat transfer of such restricted area, so the heat losses. Existing oil heater heat exchangers for the shortcomings, full use of the knowledge learned, our own ideas designed a more efficient heat transfer tubes of the fuel heater with heat exchangers. This heat exchanger tubes in the burner flame tube in one hand, the heater can increase the heat transfer area, high-temperature gas absorb heat; the other hand, direct heat exchange contact with flame, will produce bubbles in the pipe state boiling, and thus enhanced heat transfer, improving the overall thermal efficiency of the heater. In addition, also designed a series of new exhaust gas heat exchanger, full use of advanced exhaust gas heater for hot water for heating, significantly increased heater power, efficiency and reduce emissions. Key words: Car heater; Tubes; exhaust gas heat exchanger; Improvements to improve -Ⅱ-