{"id":59723,"date":"2026-03-22T23:26:51","date_gmt":"2026-03-22T17:56:51","guid":{"rendered":"https:\/\/www.eng.ruh.ac.lk\/dmme\/?post_type=dt_portfolio&#038;p=59723"},"modified":"2026-03-22T23:26:51","modified_gmt":"2026-03-22T17:56:51","slug":"design-fabrication-and-testing-of-a-water-cooled-chilled-water-ac-system-to-replace-a-split-type-12000-btu-air-cooled-ac-system","status":"publish","type":"dt_portfolio","link":"https:\/\/www.eng.ruh.ac.lk\/dmme\/project\/design-fabrication-and-testing-of-a-water-cooled-chilled-water-ac-system-to-replace-a-split-type-12000-btu-air-cooled-ac-system\/","title":{"rendered":"Design, Fabrication And Testing Of A Water-Cooled  Chilled Water AC System To Replace A Split Type 12000  BTU Air-Cooled AC System"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row equal_height=&#8221;yes&#8221; content_placement=&#8221;top&#8221; type=&#8221;vc_default&#8221; css=&#8221;.vc_custom_1584702595643{padding-bottom: 20px !important;}&#8221;][vc_column width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1572893353553{padding-bottom: 50px !important;}&#8221;][vc_column_text css=&#8221;.vc_custom_1759735824498{margin-bottom: 30px !important;border-left-width: 3px !important;padding-left: 20px !important;border-left-color: rgba(0,0,0,0.1) !important;border-left-style: solid !important;}&#8221;]<br \/>\nDr. Nanditha K. Hettiarachchi, Fernando K.D.K, Athukorala D.C., Tharaka K.T., Rathnayaka R.M.H.M.<br \/>\n[\/vc_column_text]<div id=\"ultimate-heading-87286a009de681bcb\" class=\"uvc-heading ult-adjust-bottom-margin ultimate-heading-87286a009de681bcb uvc-7937  uvc-heading-default-font-sizes\" data-hspacer=\"no_spacer\"  data-halign=\"left\" style=\"text-align:left\"><div class=\"uvc-heading-spacer no_spacer\" style=\"top\"><\/div><div class=\"uvc-main-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-87286a009de681bcb h3'  data-responsive-json-new='{\"font-size\":\"\",\"line-height\":\"\"}' ><h3 style=\"--font-weight:theme;margin-top:20px;margin-bottom:20px;\">Project Abstract<\/h3><\/div><\/div>[vc_column_text]\u2022 In the context of the 2025 Capstone Project, continued the three-year effort by enhancing water-cooled air\u0002conditioning technology for tropical and humid climates.<\/p>\n<p>\u2022 Addressed major issues of air-cooled systems such as corrosion, unstable refrigerant flow, high energy use, and<\/p>\n<p>short lifespan.<\/p>\n<p>\u2022 Integrated a tube-in-tube heat exchanger to achieve better heat transfer and stable system operation.<\/p>\n<p>\u2022 Validated the redesigned system through simulations, experiments, and performance testing.<\/p>\n<p>\u2022 Achieved an indoor temperature of 17\u00b0C, demonstrating strong cooling performance.<\/p>\n<p>\u2022 Results showed improved cooling capacity, lower energy consumption, reduced maintenance, and longer<\/p>\n<p>system lifespan.<\/p>\n<p>\u2022 The project demonstrates strong potential for future eco-friendly, scalable, high-performance HVAC solutions.[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1572893349347{padding-bottom: 50px !important;}&#8221;]<style type=\"text\/css\" data-type=\"the7_shortcodes-inline-css\">.shortcode-single-image-wrap.shortcode-single-image-caeaa28f129011f2631f0ebca119e77a.enable-bg-rollover .rollover i,\n.shortcode-single-image-wrap.shortcode-single-image-caeaa28f129011f2631f0ebca119e77a.enable-bg-rollover .rollover-video i {\n  background: -webkit-linear-gradient();\n  background: linear-gradient();\n}\n.shortcode-single-image-wrap.shortcode-single-image-caeaa28f129011f2631f0ebca119e77a .rollover-icon {\n  font-size: 32px;\n  color: #ffffff;\n  min-width: 44px;\n  min-height: 44px;\n  line-height: 44px;\n  border-radius: 100px;\n  border-style: solid;\n  border-width: 0px;\n}\n.dt-icon-bg-on.shortcode-single-image-wrap.shortcode-single-image-caeaa28f129011f2631f0ebca119e77a .rollover-icon {\n  background: rgba(255,255,255,0.3);\n  box-shadow: none;\n}\n<\/style><div class=\"shortcode-single-image-wrap shortcode-single-image-caeaa28f129011f2631f0ebca119e77a alignnone  enable-bg-rollover dt-icon-bg-off\" style=\"margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; width:500px;\"><div class=\"shortcode-single-image\"><div class=\"fancy-media-wrap  layzr-bg\" style=\"\"><img class=\"preload-me lazy-load\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D&#39;http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg&#39;%20viewBox%3D&#39;0%200%20500%20288&#39;%2F%3E\" data-src=\"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-content\/uploads\/2026\/03\/Appendix-B-500x288.png\" data-srcset=\"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-content\/uploads\/2026\/03\/Appendix-B-500x288.png 500w, https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-content\/uploads\/2026\/03\/Appendix-B-1000x576.png 1000w\" width=\"500\" height=\"288\"  data-dt-location=\"https:\/\/www.eng.ruh.ac.lk\/dmme\/project\/design-fabrication-and-testing-of-a-water-cooled-chilled-water-ac-system-to-replace-a-split-type-12000-btu-air-cooled-ac-system\/appendix-b\/\" style=\"\" alt=\"\" \/><\/div><\/div><\/div>[\/vc_column][vc_column]<div id=\"ultimate-heading-54706a009de683105\" class=\"uvc-heading ult-adjust-bottom-margin ultimate-heading-54706a009de683105 uvc-4867  uvc-heading-default-font-sizes\" data-hspacer=\"no_spacer\"  data-halign=\"center\" style=\"text-align:center\"><div class=\"uvc-heading-spacer no_spacer\" style=\"top\"><\/div><div class=\"uvc-main-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-54706a009de683105 h3'  data-responsive-json-new='{\"font-size\":\"\",\"line-height\":\"\"}' ><h3 style=\"--font-weight:theme;\">Overview<\/h3><\/div><\/div>[vc_column_text]\u2022 Conventional air cooled split AC condenser coils corrode in coastal and industrial air, a water cooled chilled water design limits exposure and improves service life.<\/p>\n<p>\u2022 Outdoor units face harsh weather and dust, leading to frequent cleaning and repairs, the chilled water approach reduces routine maintenance needs.<\/p>\n<p>\u2022 Air cooled heat rejection weakens as ambient temperature rises, a water cooled condenser with a cooling tower rejects heat more effectively and improves COP.<\/p>\n<p>\u2022 Earlier configurations produced limited indoor temperature reduction, the upgraded design aims for stronger and steadier cooling output.<\/p>\n<p>\u2022 Split systems are harder to expand and service, chilled water with fan coil units supports modular expansion and simpler maintenance, with less downtime.<\/p>\n<p>\u2022 Achieved 17 \u00b0C indoor temperature during validation, confirming effective cooling delivery for a single room under realistic operating conditions and typical internal heat loads.<\/p>\n<p>\u2022 Delivered 4.7\u20136.5 kW cooling capacity, demonstrating the system can match and exceed the demand range of a conventional 12,000 BTU room air conditioner.<\/p>\n<p>\u2022 Reached COP 3.08\u20134.26 (average 3.67), indicating strong energy efficiency and competitive performance compared with common non-inverter split air conditioners.<\/p>\n<p>\u2022 Integrated water-cooled condenser with cooling tower and tube-in-tube heat exchangers, improving heat rejection, supporting durability, and enabling scalable chilled-water distribution to fan-coil units.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]<style type=\"text\/css\" data-type=\"the7_shortcodes-inline-css\">.shortcode-single-image-wrap.shortcode-single-image-ddb510605e07a0049c45a7d7fa13f3dd.enable-bg-rollover .rollover i,\n.shortcode-single-image-wrap.shortcode-single-image-ddb510605e07a0049c45a7d7fa13f3dd.enable-bg-rollover .rollover-video i {\n  background: -webkit-linear-gradient();\n  background: linear-gradient();\n}\n.shortcode-single-image-wrap.shortcode-single-image-ddb510605e07a0049c45a7d7fa13f3dd .rollover-icon {\n  font-size: 32px;\n  color: #ffffff;\n  min-width: 44px;\n  min-height: 44px;\n  line-height: 44px;\n  border-radius: 100px;\n  border-style: solid;\n  border-width: 0px;\n}\n.dt-icon-bg-on.shortcode-single-image-wrap.shortcode-single-image-ddb510605e07a0049c45a7d7fa13f3dd .rollover-icon {\n  background: rgba(255,255,255,0.3);\n  box-shadow: none;\n}\n<\/style><div class=\"shortcode-single-image-wrap shortcode-single-image-ddb510605e07a0049c45a7d7fa13f3dd alignnone  enable-bg-rollover dt-icon-bg-off\" style=\"margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; width:500px;\"><div class=\"shortcode-single-image\"><div class=\"fancy-media-wrap  layzr-bg\" style=\"\"><img class=\"preload-me lazy-load\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D&#39;http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg&#39;%20viewBox%3D&#39;0%200%20500%20539&#39;%2F%3E\" data-src=\"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-content\/uploads\/2026\/03\/Appendix-A-500x539.png\" data-srcset=\"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-content\/uploads\/2026\/03\/Appendix-A-500x539.png 500w, https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-content\/uploads\/2026\/03\/Appendix-A-1000x1078.png 1000w\" width=\"500\" height=\"539\"  data-dt-location=\"https:\/\/www.eng.ruh.ac.lk\/dmme\/project\/design-fabrication-and-testing-of-a-water-cooled-chilled-water-ac-system-to-replace-a-split-type-12000-btu-air-cooled-ac-system\/appendix-a\/\" style=\"\" alt=\"\" \/><\/div><\/div><\/div>[\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row equal_height=&#8221;yes&#8221; content_placement=&#8221;top&#8221; type=&#8221;vc_default&#8221; css=&#8221;.vc_custom_1584702595643{padding-bottom: 20px !important;}&#8221;][vc_column width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1572893353553{padding-bottom: 50px !important;}&#8221;][vc_column_text css=&#8221;.vc_custom_1759735824498{margin-bottom: 30px !important;border-left-width: 3px !important;padding-left: 20px !important;border-left-color: rgba(0,0,0,0.1) !important;border-left-style: solid !important;}&#8221;] Dr. Nanditha K. Hettiarachchi, Fernando K.D.K, Athukorala D.C., Tharaka K.T., Rathnayaka R.M.H.M. [\/vc_column_text][vc_column_text]\u2022 In the context of the 2025 Capstone Project, continued the three-year effort by enhancing water-cooled air\u0002conditioning technology for tropical and&hellip;<\/p>\n","protected":false},"author":19,"featured_media":59724,"comment_status":"closed","ping_status":"closed","template":"","dt_portfolio_category":[],"dt_portfolio_tags":[],"_links":{"self":[{"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/dt_portfolio\/59723"}],"collection":[{"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/dt_portfolio"}],"about":[{"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/types\/dt_portfolio"}],"author":[{"embeddable":true,"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/comments?post=59723"}],"version-history":[{"count":1,"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/dt_portfolio\/59723\/revisions"}],"predecessor-version":[{"id":59727,"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/dt_portfolio\/59723\/revisions\/59727"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/media\/59724"}],"wp:attachment":[{"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/media?parent=59723"}],"wp:term":[{"taxonomy":"dt_portfolio_category","embeddable":true,"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/dt_portfolio_category?post=59723"},{"taxonomy":"dt_portfolio_tags","embeddable":true,"href":"https:\/\/www.eng.ruh.ac.lk\/dmme\/wp-json\/wp\/v2\/dt_portfolio_tags?post=59723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}