{"id":677343,"date":"2024-09-04T13:15:48","date_gmt":"2024-09-04T12:15:48","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=677343"},"modified":"2024-09-04T13:15:48","modified_gmt":"2024-09-04T12:15:48","slug":"lam-the-nao-giam-sat-nhiet-do-bao-ve-thiet-bi","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/lam-the-nao-giam-sat-nhiet-do-bao-ve-thiet-bi\/","title":{"rendered":"L\u00e0m th\u1ebf n\u00e0o gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb"},"content":{"rendered":"<p class=\"sidekick\">Gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb: H\u01b0\u1edbng d\u1eabn c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 c\u00f4ng ngh\u1ec7 hi\u1ec7n \u0111\u1ea1i \u0111\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 an to\u00e0n, gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd thi\u1ebft b\u1ecb.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/lam_the_nao_giam_sat_nhiet_do_bao_ve_thiet_bi.png\" alt=\"L\u00e0m th\u1ebf n\u00e0o gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>L\u00e0m Th\u1ebf N\u00e0o Gi\u00e1m S\u00e1t Nhi\u1ec7t \u0110\u1ed9 B\u1ea3o V\u1ec7 Thi\u1ebft B\u1ecb<\/h2>\n<p>Trong l\u0129nh v\u1ef1c nhi\u1ec7t k\u1ef9 thu\u1eadt, vi\u1ec7c gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 l\u00e0 m\u1ed9t b\u01b0\u1edbc quan tr\u1ecdng \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c thi\u1ebft b\u1ecb kh\u1ecfi h\u01b0 h\u1ecfng v\u00e0 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh. H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u c\u00e1ch th\u1ee9c gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c thi\u1ebft b\u1ecb.<\/p>\n<h2>1. T\u1ea1i Sao Ph\u1ea3i Gi\u00e1m S\u00e1t Nhi\u1ec7t \u0110\u1ed9?<\/h2>\n<p>Thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 cao. N\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c gi\u00e1m s\u00e1t k\u1ef9 l\u01b0\u1ee1ng, nhi\u1ec7t \u0111\u1ed9 qu\u00e1 cao ho\u1eb7c qu\u00e1 th\u1ea5p c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn:<\/p>\n<ul>\n<li>Hi\u1ec7u su\u1ea5t k\u00e9m<\/li>\n<li>H\u01b0 h\u1ecfng v\u1eadt li\u1ec7u<\/li>\n<li>L\u00e3ng ph\u00ed n\u0103ng l\u01b0\u1ee3ng<\/li>\n<li>Th\u1eadm ch\u00ed g\u00e2y nguy hi\u1ec3m cho ng\u01b0\u1eddi s\u1eed d\u1ee5ng<\/li>\n<\/ul>\n<h2>2. C\u00e1c Ph\u01b0\u01a1ng Ph\u00e1p Gi\u00e1m S\u00e1t Nhi\u1ec7t \u0110\u1ed9<\/h2>\n<p>C\u00f3 nhi\u1ec1u c\u00e1ch \u0111\u1ec3 gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 c\u1ee7a thi\u1ebft b\u1ecb, t\u1eeb c\u00e1c thi\u1ebft b\u1ecb \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p:<\/p>\n<ul>\n<li>Thermocouples<\/li>\n<li>Thermistors<\/li>\n<li>RTD (Resistance Temperature Detectors)<\/li>\n<li>H\u1ec7 th\u1ed1ng gi\u00e1m s\u00e1t t\u1eeb xa (SCADA)<\/li>\n<\/ul>\n<h2>3. Thermocouples<\/h2>\n<p>Thermocouples l\u00e0 m\u1ed9t trong nh\u1eefng thi\u1ebft b\u1ecb \u0111o nhi\u1ec7t \u0111\u1ed9 ph\u1ed5 bi\u1ebfn nh\u1ea5t, ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7n t\u01b0\u1ee3ng Seebeck, trong \u0111\u00f3 hai kim lo\u1ea1i kh\u00e1c nhau t\u1ea1o ra \u0111i\u1ec7n \u00e1p khi c\u00f3 s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9. C\u00f4ng th\u1ee9c t\u00ednh voltage (V) t\u1eeb nhi\u1ec7t \u0111\u1ed9 (T) l\u00e0:<\/p>\n<p>V = aT + bT<sup>2<\/sup><\/p>\n<h2>4. Thermistors<\/h2>\n<p>Thermistors l\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n tr\u1edf thay \u0111\u1ed5i theo nhi\u1ec7t \u0111\u1ed9. C\u00f3 hai lo\u1ea1i ch\u00ednh: NTC (Negative Temperature Coefficient) v\u00e0 PTC (Positive Temperature Coefficient). V\u1edbi NTC, \u0111i\u1ec7n tr\u1edf gi\u1ea3m khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng:<\/p>\n<p>R(T) = R<sub>0<\/sub> * exp(B(1\/T &#8211; 1\/T<sub>0<\/sub>))<\/p>\n<h2>5. RTD \u2013 Resistance Temperature Detectors<\/h2>\n<p>RTD l\u00e0 c\u00e1c c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao, \u0111o nhi\u1ec7t \u0111\u1ed9 d\u1ef1a tr\u00ean s\u1ef1 thay \u0111\u1ed5i \u0111i\u1ec7n tr\u1edf c\u1ee7a kim lo\u1ea1i, th\u01b0\u1eddng l\u00e0 b\u1ea1ch kim. M\u1ed1i quan h\u1ec7 gi\u1eefa \u0111i\u1ec7n tr\u1edf v\u00e0 nhi\u1ec7t \u0111\u1ed9 l\u00e0 tuy\u1ebfn t\u00ednh:<\/p>\n<p>R(T) = R<sub>0<\/sub> (1 + \u03b1(T &#8211; T<sub>0<\/sub>))<\/p>\n<h2>6. H\u1ec7 Th\u1ed1ng Gi\u00e1m S\u00e1t T\u1eeb Xa (SCADA)<\/h2>\n<p>SCADA (Supervisory Control and Data Acquisition) l\u00e0 h\u1ec7 th\u1ed1ng gi\u00e1m s\u00e1t v\u00e0 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa, cho ph\u00e9p ng\u01b0\u1eddi v\u1eadn h\u00e0nh gi\u00e1m s\u00e1t t\u00ecnh tr\u1ea1ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb trong th\u1eddi gian th\u1ef1c t\u1eeb xa. SCADA s\u1eed d\u1ee5ng nhi\u1ec1u c\u1ea3m bi\u1ebfn \u0111\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u nhi\u1ec7t \u0111\u1ed9 v\u00e0 hi\u1ec3n th\u1ecb th\u00f4ng tin qua giao di\u1ec7n \u1ee9ng d\u1ee5ng.<\/p>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>Gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 l\u00e0 b\u01b0\u1edbc thi\u1ebft y\u1ebfu trong vi\u1ec7c b\u1ea3o v\u1ec7 v\u00e0 duy tr\u00ec hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 thi\u1ebft b\u1ecb gi\u00e1m s\u00e1t hi\u1ec7n \u0111\u1ea1i, ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb ho\u1ea1t \u0111\u1ed9ng an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3 trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec1u th\u00e1ch th\u1ee9c.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gi\u00e1m s\u00e1t nhi\u1ec7t \u0111\u1ed9 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb: H\u01b0\u1edbng d\u1eabn c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 c\u00f4ng ngh\u1ec7 hi\u1ec7n \u0111\u1ea1i \u0111\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 an to\u00e0n, gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd thi\u1ebft b\u1ecb.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - 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