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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 ثابت و درجه حرارت هوای ورودی متغییر می باشد. به این سیستم ها اصطلاحاً "حجم ثابت درجه حرارت متغییر" گفته می شود.
تا کنون سیستم های حجم ثابت بسیاری طراحی شده اند که هدف از طراحی این سیستم های مختلف در واقع جبران بار های حرارتی و برودتی و کنترل چندین زون به طور همزمان در یک لحظه می باشد.
انواع سیستم های حجم ثابت شامل موارد زیر می باشد :
1- تمام هوایی تک زونه(Basic CAV)
2- حجم ثابت با بازگرمایش ترمینالی (CAV with Terminal Reheat)
3- حجم ثابت دو کاناله (CAV _ DD)
1-3- دو کاناله با گرمایش زون
2-3- دو کاناله با کویل سرمایش
3-3- دوکاناله با دو فن
4- سیستم چند زونه (CAV _ MZ)
1-4- چند زونه با گرمایش زون
2-4- چند زونه با سه پلنیوم
3-4- چند زونه با کویل سرمایش قبل از فن
مزایای سیستم های حجم ثابت :
طراحی این سیستم ها دارای پیچیدگی نمی باشد و به این دلیل نیز کنترل این سیستم ها بسیار ساده می باشد.
معایب سیستم های حجم ثابت :
یکی از بزرگترین معایب این سیستم ها مصرف بالای انرژی آنها می باشد که دلیل آن هم به این خاطر است که فن هوای رفت و برگشت همیشه باید در حالت پیک بار خود کار کند. متاسفانه استفاده از این سیستم ها در کشور ما بسیار رایج می باشد.
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