Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Tối ưu hóa việc thu hồi nhiệt của bộ trao đổi nhiệt dạng ống và bó ống với các baffle xoáy liên tục cho hệ thống thông gió bằng khí
Tóm tắt
Chúng tôi báo cáo một đánh giá định lượng về tác động của baffle xoáy liên tục lên hiệu suất thu hồi nhiệt của các bộ trao đổi nhiệt dạng ống bó theo chiều đối lưu. Góc nghiêng của baffle đã được thay đổi từ $$11^{\circ }$$ đến $$22^{\circ }$$. Do lưu chất chảy qua bó ống theo một góc do dòng chảy xoáy bên trong vỏ, bộ trao đổi nhiệt hoạt động theo chế độ đối lưu chéo. Các mô phỏng bằng phần mềm Fluent với mô hình mô phỏng độ biến đổi dòng chảy k-$$\omega$$ đã được thực hiện để điều tra các tham số nhiệt-hydraulic của hệ thống từ góc độ hiệu suất thu hồi nhiệt, tổn thất áp suất, và tỷ lệ truyền nhiệt tổng thể. Nhiệt độ không khí bên ngoài đã được thay đổi để mô phỏng thời tiết lạnh và ấm. Tổn thất áp suất đã được giới hạn ở mức dưới 250 Pa, phù hợp với tiêu chuẩn của EU về nhãn năng lượng cho các đơn vị thông gió dân dụng. Tại lưu lượng dòng tối đa là 40 m$$^3$$/h, thiết bị đạt hiệu suất thu hồi nhiệt trên $$80\%$$ cho sự khác biệt về nhiệt độ đã xem xét. Các baffle xoáy liên tục đã giúp cải thiện truyền nhiệt đối lưu bằng cách giảm diện tích dòng chảy chéo và tăng vận tốc. Các góc nhỏ hơn dẫn đến tổn thất áp suất lớn hơn trong khi không có ảnh hưởng rõ ràng tới hiệu suất thu hồi nhiệt cho hình dạng đã xem xét. Phân tích này thể hiện tiềm năng của một bộ trao đổi nhiệt tái sinh dạng đối lưu chéo nhỏ gọn với các baffle xoáy liên tục cho các hệ thống thông gió phân tán và đóng vai trò là cơ sở cho việc tối ưu hóa tiếp theo.
Từ khóa
#bộ trao đổi nhiệt #baffle xoáy #thu hồi nhiệt #hiệu suất #thông gióTài liệu tham khảo
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