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در این سیستم ها جهت جبران بار های حرارتی و برودتی فضای مورد نظر حجم هوای ورودی(CFM) به آن فضا بر خلاف سیستم های حجم ثابت ، متغییر و درجه حرارت هوای ورودی ثابت می باشد. به این سیستم ها اصطلاحاً "حجم متغییر درجه حرارت ثابت" گفته می شود.
انواع سیستم های حجم متغییر شامل موارد زیر می باشد :
1- سیتم حجم متغییر پایه
2- حجم متغییر همراه با گرمایش پیرامونی
3- حجم متغییر با جعبه القاء (VAV With Induction Box)
4- حجم متغییر با ترمینال مجهز به فن(VAV With Fan Powered Terminal)
5- حجم متغییر با بازگرمایش ترمینال(VAV With Terminal Reheat)
6- حجم متغییر دو کاناله (VAV Double Duct)
1-6- دو کاناله با گرمایش مربوط به هر زون
2-6- دو کاناله با کویل سرمایش قبل از فن
3-6- دوکاناله با دو فن
4-6- دو کاناله همراه با کویل سرمایش اضافی
7- سیستم چند زونه
مزایای سیستم های حجم متغییر :
از مهمترین مزایای این سیستم ها می توان به مصرف انرژی بسیار کمتر نسبت به سیستم های حجم ثابت اشاره نمود.در واقع در این سیستم ها هیچ گونه اتلاف انرژی وجود ندارد.
هواساز ها در این سیستم ها کوچکتر بوده و حجم کانال کشی نیز کاهش می یابد.
معایب سیستم های حجم متغییر :
طراحی این سیستم ها بسیار پیچیده بوده و نیاز به طراحی سیستم کنترل خاص می باشد. خدمات طراحی، مشاوره، نظارت و اجرای این سیستم در ایران توسط شرکت مهندسی اسوه عمران انرژی ارائه می گردد. برای کسب اطلاعات بیشتر با شرکت تماس حاصل نمایید.
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