{"id":6206,"date":"2026-10-19T08:27:10","date_gmt":"2026-10-19T01:27:10","guid":{"rendered":"https:\/\/onggiosaoviet.vn\/?p=6206"},"modified":"2026-10-19T08:27:10","modified_gmt":"2026-10-19T01:27:10","slug":"ton-that-ap-suat-trong-duong-ong-gio-cac-yeu-to-thiet-ke-can-quan-tam","status":"publish","type":"post","link":"https:\/\/onggiosaoviet.vn\/en\/ton-that-ap-suat-trong-duong-ong-gio-cac-yeu-to-thiet-ke-can-quan-tam\/","title":{"rendered":"Pressure loss in air ducts: Design factors to consider."},"content":{"rendered":"

Learn about the factors that cause pressure loss in HVAC duct systems, such as duct length, elbows, branches, cross-section, and fittings.<\/h2>\n\n\n\n

When designing ventilation and air conditioning systems, airflow is not the only factor to consider. Air moving through straight ducts, elbows, reducers, branches, and valves all create some resistance. If pressure losses are not adequately accounted for, the system may struggle to achieve the required airflow or the fans may have to operate in an unsuitable mode.<\/p>\n\n\n

\"\"<\/figure>\n\n\n

1. Where does pressure loss originate?<\/h2>\n\n\n\n

Pressure losses are typically considered in two groups: losses along the duct due to friction as air moves through the pipe, and local losses at components such as elbows, tees, reducers, valves, and air grilles. The total loss of the line is related to its length, cross-section, surface roughness, air velocity, and fitting geometry.<\/p>\n\n\n\n

Therefore, simply looking at duct size or fan power will not be enough to assess the efficiency of the entire system.<\/p>\n\n\n\n

2. Factors that can increase resistance<\/h2>\n\n\n\n

Excessively long pipelines, numerous changes in direction, abrupt changes in cross-section, or poorly designed branching can all increase losses. Modifying the pipeline route on-site without updating calculations can also lead to operating conditions different from the original design.<\/p>\n\n\n\n

The cross-sectional dimensions should be selected based on the flow rate and velocity limits appropriate for the project. Do not arbitrarily increase or decrease the dimensions simply for ease of construction without confirmation from the design team.<\/p>\n\n\n\n

\"Van<\/figure>\n\n\n\n

3. Coordination between drawings, accessories, and fan selection.<\/h2>\n\n\n\n

The drawings should clearly show the dimensions, alignment, diversion points, and main fittings. When changing the pipe structure or route, the contractor should coordinate with the design team to assess the impact on pressure loss. This calculation data is also crucial when selecting fans and adjusting the system.<\/p>\n\n\n\n

4. Summary table of influencing factors<\/h2>\n\n\n\n

The following table is for design review purposes only; it does not replace hydraulic calculations or manufacturer's technical data.<\/p>\n\n\n\n

Element<\/strong><\/td>Potential effects<\/strong><\/td>Points that need review<\/strong><\/td><\/tr>
Pipeline length<\/td>Increase friction along the road.<\/td>Optimizing the route while ensuring sufficient space and maintenance.<\/td><\/tr>
Co, cut, numb<\/td>Creating local losses<\/td>Use the correct structure as shown in the drawing, avoiding unnecessary changes in direction.<\/td><\/tr>
Change the cross-section<\/td>It can cause sudden changes in airflow.<\/td>Check the size and shape of the cone.<\/td><\/tr>
Valves and air vents<\/td>Create resistance based on structure and operating conditions.<\/td>Compare the specifications and installation location.<\/td><\/tr>
Differences from the design<\/td>Altering the pipeline's characteristics<\/td>Update the drawings and obtain approval before construction begins.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Conclusion<\/h2>\n\n\n\n

Pressure losses need to be considered from the design phase and continuously monitored during fabrication and installation. Close coordination between the design unit, M&E contractor, and manufacturer helps minimize unnecessary changes and supports the system's operation according to the set objectives.<\/p>\n\n\n\n

Contact Sao Viet Air Ducting<\/h2>\n\n\n\n

Sao Viet Ducting provides fabrication services for square, round, spiral ducting and HVAC accessories according to technical specifications. Contractors can submit drawings to discuss the structure and scope of supply.<\/p>\n\n\n\n

SAO VIET AIR DUCT MANUFACTURING AND TRADING COMPANY LIMITED<\/strong><\/p>\n\n\n\n

Address: 267 Le Thanh Tong, May Chai, Hai Phong<\/p>\n\n\n\n

Hanoi Representative Office: No. 19, Lane 24, Kim Dong Street, Giap Bat Ward, Hoang Mai District, Hanoi<\/p>\n\n\n\n

Hotline: 0815.999.826 \u2013 0934.559.168 | Technical support: 0949.852.886<\/p>\n\n\n\n

Email: vietonggio@gmail.com<\/p>","protected":false},"excerpt":{"rendered":"

T\u00ecm hi\u1ec3u c\u00e1c y\u1ebfu t\u1ed1 g\u00e2y t\u1ed5n th\u1ea5t \u00e1p su\u1ea5t trong h\u1ec7 th\u1ed1ng \u1ed1ng gi\u00f3 HVAC nh\u01b0 chi\u1ec1u d\u00e0i tuy\u1ebfn, co c\u00fat, nh\u00e1nh chia, ti\u1ebft di\u1ec7n v\u00e0 ph\u1ee5 ki\u1ec7n. Khi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng th\u00f4ng gi\u00f3 v\u00e0 \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed, l\u01b0u l\u01b0\u1ee3ng gi\u00f3 kh\u00f4ng ph\u1ea3i y\u1ebfu t\u1ed1 duy nh\u1ea5t c\u1ea7n xem x\u00e9t. Kh\u00f4ng kh\u00ed […]<\/p>\n","protected":false},"author":4,"featured_media":5742,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[546,273,550,133,130,551,548,269],"class_list":["post-6206","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc","tag-co-cut","tag-giai-phap-cho-he-thong-ong-gio","tag-nhanh-chia","tag-ong-gio-hai-phong","tag-ong-gio-sao-viet","tag-tiet-dien-va-phu-kien","tag-tim-hieu-cac-yeu-to-gay-ton-that-ap-suat-trong-he-thong-ong-gio-hvac-nhu-chieu-dai-tuyen","tag-ton-that-ap-suat-ong-gio"],"_links":{"self":[{"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/posts\/6206","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/comments?post=6206"}],"version-history":[{"count":1,"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/posts\/6206\/revisions"}],"predecessor-version":[{"id":6207,"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/posts\/6206\/revisions\/6207"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/media\/5742"}],"wp:attachment":[{"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/media?parent=6206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/categories?post=6206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onggiosaoviet.vn\/en\/wp-json\/wp\/v2\/tags?post=6206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}