{"id":11443,"date":"2026-07-24T12:27:22","date_gmt":"2026-07-24T10:27:22","guid":{"rendered":"https:\/\/www.tempco.it\/blog\/?p=11443"},"modified":"2026-07-24T12:27:22","modified_gmt":"2026-07-24T10:27:22","slug":"wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers","status":"publish","type":"post","link":"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/","title":{"rendered":"Wastewater heat recovery with custom immersion plate heat exchangers"},"content":{"rendered":"

Tempco<\/strong> has implemented an interesting new energy-saving application using custom immersion plate heat exchangers<\/a><\/strong> for a client in the parboiled rice production<\/strong> sector. Specifically, for this project, Tempco manufactured and supplied two arrays of custom immersion heat exchangers<\/strong>\u2014each consisting of 20 plates measuring 2500 x 500 mm, made of AISI 316L stainless steel<\/strong> with a 100 mm plate spacing. This custom application is of significant interest to energy managers and technical specialists across various industries, as it is ideally suited for other food and beverage<\/strong><\/a> production processes, as well as the chemical<\/strong><\/a> and pharmaceutical<\/strong><\/a> sectors.<\/p>\n

In this specific case, the immersion plate heat exchanger<\/strong><\/a> arrays have been installed in the equalization tank<\/strong>, which receives the wastewater generated by the parboiling process<\/strong>\u2014consisting primarily of water used to soak the paddy rice. The purpose of the custom immersion plate heat exchanger is to recover heat from the wastewater<\/strong>, yielding a dual benefit: first, the recovered heat preheats well water circulating within the plates to the highest possible temperature, resulting in significant energy savings by reducing steam consumption<\/strong>. Second, the heat transfer process cools the wastewater before it is sent to the purification plant, providing a substantial advantage for the biological treatment processes taking place there.<\/p>\n

\"Image<\/p>\n

The system was implemented as custom and in retrofit<\/strong>, utilizing existing structures within the client\u2019s equalization tank. Specifically, the existing agitators<\/strong> were leveraged to maintain a fluid velocity of \u22650.1 m\/s, generating turbulence that enhances heat transfer efficiency. Furthermore, the immersion heat exchanger arrays were installed by anchoring them to decommissioned aeration pipes (2.0 x 2.6 m).<\/p>\n

Overall, the system will enable significant energy savings for the client, recovering approximately 174 kW of heat<\/strong> (150,000 kcal\/h) and saving 1,500\u20131,700 tonnes of steam per year. Material selection for the heat exchanger plates was also critical; AISI 316L stainless steel<\/strong> was chosen to ensure corrosion resistance<\/strong><\/a> (handling wastewater with a pH of 3.7\u20133.9 with no critical chloride levels). Fouling<\/strong><\/a> caused by starches in the wastewater was accounted for using a conservative fouling factor (4E-4 m\u00b2K\/W). Finally, given the intermittent nature of the wastewater flow\u2014process wastewater is discharged every two hours, though a minimum volume is always maintained in the tank\u2014performance was calculated at 70% of the theoretical maximum to determine the system’s ROI.<\/p>\n","protected":false},"excerpt":{"rendered":"

Tempco custom immersion plate heat exchangers arrays designed for energy-saving applications\u2014specifically heat recovery from wastewater used for well-water preheating\u2014installed in an equalization tank for parboiled rice production.<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[64,247,61,73,470,63,143,80,113,473],"tags":[4788,3268,139,816,126,74,1758,3543,483,145,161,4785,4787,4784,142,123,4516,1393,4789,4783,3938,1543,342,3930,1535,4782,1374,4786],"yoast_head":"\nWastewater heat recovery with custom immersion plate heat exchangers - Tempco Blog<\/title>\n<meta name=\"description\" content=\"Tempco custom immersion plate heat exchangers arrays designed for energy-saving and heat recovery from wastewater in rice production.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Wastewater heat recovery with custom immersion plate heat exchangers - Tempco Blog\" \/>\n<meta property=\"og:description\" content=\"Tempco custom immersion plate heat exchangers arrays designed for energy-saving and heat recovery from wastewater in rice production.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/\" \/>\n<meta property=\"og:site_name\" content=\"Tempco Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/tempco.srl\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-24T10:27:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2026\/07\/Tempco-scambiatori-a-immersione-vasca-equalizzazione-coltura-riso-1.jpg\" \/>\n<meta name=\"author\" content=\"Marco Zambelli\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Tempco_it\" \/>\n<meta name=\"twitter:site\" content=\"@Tempco_it\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Marco Zambelli\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/\"},\"author\":{\"name\":\"Marco Zambelli\",\"@id\":\"https:\/\/www.tempco.it\/blog\/#\/schema\/person\/7b9316f2ae038cf675b9efcabca742f4\"},\"headline\":\"Wastewater heat recovery with custom immersion plate heat exchangers\",\"datePublished\":\"2026-07-24T10:27:22+00:00\",\"dateModified\":\"2026-07-24T10:27:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/\"},\"wordCount\":380,\"publisher\":{\"@id\":\"https:\/\/www.tempco.it\/blog\/#organization\"},\"keywords\":[\"AISI 316L\",\"beverage\",\"chemical\",\"custom\",\"energy efficiency\",\"energy saving\",\"food\",\"fouling\",\"fouling factor\",\"heat recovery\",\"heat transfer\",\"immersion plate heat exchangers\",\"parboiled rice\",\"parboiling\",\"pharmaceutical\",\"plate heat exchangers\",\"preheating\",\"purification\",\"retrofit\",\"rice production\",\"solid sustainability\",\"solid temperature\",\"sustainability\",\"Tempco Green\",\"turbulent flow\",\"wastewater\",\"water treatment\",\"well water\"],\"articleSection\":[\"Cooling\",\"corrosion\",\"Energia Termica @en\",\"Energy Saving\",\"Fouling factor\",\"Heat exchangers\",\"Heat recovery\",\"Immerged heat exchangers\",\"plate heat exchanger\",\"Scambiatori a piastre\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/\",\"url\":\"https:\/\/www.tempco.it\/blog\/en\/11443\/wastewater-heat-recovery-with-custom-immersion-plate-heat-exchangers\/\",\"name\":\"Wastewater heat recovery with custom immersion plate heat exchangers - 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