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نویسندگان مقالات پربازدید :
ساختمان و محیط زیست
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • research on the control laws of the electronic expansion valve for an air source heat pump water heater

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 459
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     compared to the conventional air conditioner, the air source heat pump water heater (ashpwh) possesses wider operating ranges and more dramatic changes in working conditions. conversely, traditional throttle devices, such as the thermostatic expansion valve (tev) and capillary tube, are restricted by narrow regulating ranges in refrigerant mass flow rate and lagging response to the superheat. this article incorporates a novel dual-fuzzy-controller to regulate the electronic expansion valve (eev) specialized for the ashpwh system. the study analyzes the effects of the eev initial opening and the target superheat on the performance of the ashpwh. moreover, this research proposes a fuzzy control method of selecting the initial opening and the target superheat on the basis of the ambient temperature and water temperature, and employs superheat error (e) and the derivation of superheat error (ec) as the input variables of the fuzzy controller b to regulate the opening of the eev during steady running process. to improve self-adaptability of the fuzzy controller, a rule modifier and a gain scheduler are introduced. in order to quantitatively reflect the difference in the performance between the tev-controlled system and eev-controlled one, experimental comparison between the eev and the tev is presented. results demonstrate that both the stability and efficiency of the ashpwh can be improved significantly by the eev.

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