--- title: "The Technology of Cooling Part 3: Cooling with Closed Loop Cooling Units" description: Find out when cooling with Closed Loop Cooling Units is the best solution for your thermal management project. image: https://blog.pfannenbergusa.com/hubfs/Cooling_Unit_Side_Mount.jpg --- [![Pfannenberg](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1141140508.png)](http://www.pfannenbergusa.com/) [![joinnewsletter](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1141456068.png)](https://www.pfannenbergusa.com/join-newsletter) # Enclosure & Electronics Cooling, Liquid Cooling and Signaling Solutions ## [The Technology of Cooling Part 3: Cooling with Closed Loop Cooling Units](https://blog.pfannenbergusa.com/the-technology-of-cooling-part-three-cooling-with-closed-loop-cooling-units) Posted by [Marine Vienney](https://blog.pfannenbergusa.com/author/marine-vienney) on Jul 21, 2016 11:58:32 AM - [Tweet](https://twitter.com/share) **Pfannenberg cooling units operate on the principle of the Carnot cycle.** This means that the cooling units function as a heat pump that “pumps” the thermal energy transferred from the electronic cabinet (heat dissipated from the components) up to a higher level of temperature (the ambient temperature can reach levels as high as + 55 °C). The air inside the enclosure is cooled down by the evaporator and at the same time dehumidified.![DTS_Group.jpg](https://blog.pfannenbergusa.com/hs-fs/hubfs/DTS_Group.jpg?width=413&name=DTS_Group.jpg)** How do I know if a cooling unit is the right product for my application?** - If the ambient temperature is greater than the target internal temperature of the enclosure, active cooling is required. - If indoor NEMA Type 12 applications, NEMA Type 3R/4 outdoor applications and NEMA Type 4/4x stainless steel for washdown applications are required - closed loop cooling can maintain the NEMA Type rating of the cabinet. ** Properly sizing a cooling unit** ![Cooling_Units_Sizing.jpg](https://blog.pfannenbergusa.com/hs-fs/hubfs/Cooling_Units_Sizing.jpg?width=361&name=Cooling_Units_Sizing.jpg)To properly size your cooling units you must know **the required cooling capacity in Watts, mounting requirements (side, integrated or top mount) and the dimensions of the cooling unit and enclosure.** ** **     **Utilizing performance curves to properly size cooling units:** ![Performance_Curve_Cooling_Unit.jpg](https://blog.pfannenbergusa.com/hs-fs/hubfs/Performance_Curve_Cooling_Unit.jpg?width=314&name=Performance_Curve_Cooling_Unit.jpg) **>** Pfannenberg utilizes the DIN standard 35/35 °C when rating our cooling units. **> **Many other companies use 50/50 °C, which provides a higher, non-usable value. Customers should use their own application temperatures to determine the proper cooling capacity of the system.** **     **![Cooling_Unit_Side_Mount.jpg](https://blog.pfannenbergusa.com/hs-fs/hubfs/Cooling_Unit_Side_Mount.jpg?width=258&name=Cooling_Unit_Side_Mount.jpg)Important information when utilizing cooling units:** - The refrigeration capacity should exceed the dissipation loss from the installed components by approximately 10%. - The enclosure should be sealed to prevent the inflow of ambient air. - Use the door contact switch to impede operation with open doors and consequent excessive accumulation of condensation. - Use cooling units with maximum clearance between air inflow and air outflow to prevent poor circulation. - Make sure that the air inflow and air outflow in the external circuit is not hindered, preventing proper heat exchanging at the condenser. - When using top-mounted cooling units, make sure that components with their own fans do not expel the air directly into the cooling units cool air outflow. - Make sure unit is level. - Setting the temperature to the lowest setting is not the optimal solution due to the condensation issues. The value we have preset on the cooling unit is a sound compromise between cooling the inside of the enclosure and the accumulation of condensation. --- In harsh environments involving high temperatures, wash-down requirements, heavy particulate matter or the presence of chemicals capable of damaging components (NEMA 4 or 12 environments), ambient air must be kept out of the enclosure. [**Pfannenberg Cooling Units**](https://www.pfannenbergusa.com/cooling_units) seals out the ambient air, cooling and re-circulating clean, cool air throughout the enclosure. Pfannenberg offers Critical Thermal Management Solutions for Maximum uptime and efficiency. **Find the previous articles of this "Technology of Cooling" serie: **[Cooling with Filterfans®](https://blog.pfannenbergusa.com/the-technology-of-cooling-with-filterfans) **and **[Cooling with Closed Loop Air to Air Heat Exchangers](https://blog.pfannenbergusa.com/cooling-with-closed-loop-air-to-air-heat-exchangers). **Read the last part of this "Technology of Cooling" serie: **[Closed Loop Liquid Cooling Solutions](https://blog.pfannenbergusa.com/the-technology-of-cooling-part-4-closed-loop-liquid-cooling-solutions)   Topics: [Enclosure Cooling](https://blog.pfannenbergusa.com/topic/enclosure-cooling), [Cooling Units](https://blog.pfannenbergusa.com/topic/cooling-units), [Thermal Management](https://blog.pfannenbergusa.com/topic/thermal-management) ## Your Thermal Management & Signaling Technology Experts ### The Technology of Cooling and Industrial Signaling Keep up to date with the latest: - Technical Documents - Case Studies - Electronics and Enclosure Cooling Solutions - Application Support from our Engineers ### Subscribe to Email Updates ### Recent Posts ### Posts by Topic - [Thermal Management (43)](https://blog.pfannenbergusa.com/topic/thermal-management) - [North America (38)](https://blog.pfannenbergusa.com/topic/north-america) - [Enclosure Cooling (34)](https://blog.pfannenbergusa.com/topic/enclosure-cooling) - [Cooling Units (29)](https://blog.pfannenbergusa.com/topic/cooling-units) - [Industrial Safety & Signaling Solutions (28)](https://blog.pfannenbergusa.com/topic/industrial-safety-signaling-solutions) - [Food & Beverage (23)](https://blog.pfannenbergusa.com/topic/food-beverage) - [Air Water Heat Exchangers (22)](https://blog.pfannenbergusa.com/topic/air-water-heat-exchangers) - [Company News & Annoucements (21)](https://blog.pfannenbergusa.com/topic/company-news-annoucements) - [Chillers (15)](https://blog.pfannenbergusa.com/topic/chillers) - [Packaged Chillers (13)](https://blog.pfannenbergusa.com/topic/packaged-chillers) - [Water Cooling (13)](https://blog.pfannenbergusa.com/topic/water-cooling) - [Filterfans (11)](https://blog.pfannenbergusa.com/topic/filterfans) - [Community Involvement (5)](https://blog.pfannenbergusa.com/topic/community-involvement) - [Trade Show (5)](https://blog.pfannenbergusa.com/topic/trade-show) - [Alarms (4)](https://blog.pfannenbergusa.com/topic/alarms) - [Heaters (4)](https://blog.pfannenbergusa.com/topic/heaters) - [Industry 4.0 (4)](https://blog.pfannenbergusa.com/topic/industry-4-0) - [Internet of Things (4)](https://blog.pfannenbergusa.com/topic/internet-of-things) - [Bakery (3)](https://blog.pfannenbergusa.com/topic/bakery) - [Commercial Bakeries (3)](https://blog.pfannenbergusa.com/topic/commercial-bakeries) - [liquid cooling (3)](https://blog.pfannenbergusa.com/topic/liquid-cooling) - [Industrial Internet (2)](https://blog.pfannenbergusa.com/topic/industrial-internet) - [IoT (2)](https://blog.pfannenbergusa.com/topic/iot) - [Marine Alarms (2)](https://blog.pfannenbergusa.com/topic/marine-alarms) - [Maritime Alarms (2)](https://blog.pfannenbergusa.com/topic/maritime-alarms) - [Thermostats (2)](https://blog.pfannenbergusa.com/topic/thermostats) - [Wastewater Treatment (2)](https://blog.pfannenbergusa.com/topic/wastewater-treatment) - [boat alarms (2)](https://blog.pfannenbergusa.com/topic/boat-alarms) - [3D Coverage (1)](https://blog.pfannenbergusa.com/topic/3d-coverage) - [Air Air Heat Exchangers (1)](https://blog.pfannenbergusa.com/topic/air-air-heat-exchangers) - [Case Study (1)](https://blog.pfannenbergusa.com/topic/case-study) - [Food and Beverage (1)](https://blog.pfannenbergusa.com/topic/food-and-beverage) - [Gas Detection (1)](https://blog.pfannenbergusa.com/topic/gas-detection) - [Hygrostats (1)](https://blog.pfannenbergusa.com/topic/hygrostats) - [Water Treatment (1)](https://blog.pfannenbergusa.com/topic/water-treatment) - [rainhoods (1)](https://blog.pfannenbergusa.com/topic/rainhoods) [see all](https://blog.pfannenbergusa.com/the-technology-of-cooling-part-three-cooling-with-closed-loop-cooling-units#) - [![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1155748085.png)](http://www.pfannenbergusa.com/pss) - [![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1155743050.png)](http://www.pfannenbergusa.com/pss) [Need a little Help? Check out our video guides.](http://www.pfannenbergusa.com/pss-videos) - [![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1152516006.png)](http://www.pfannenbergusa.com/tools) - [![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1155743065.png)](http://www.pfannenbergusa.com/tools) - [![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1152516011.png)](http://www.pfannenbergusa.com/commerce/track-shipment) - [![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1156818865.png)](http://www.pfannenbergusa.com/commerce/track-shipment) ## Solution Success Stories **[Pacific Ozone Keeps Electronics Cool with Filterfans](http://www.pfannenbergusa.com/pacific_ozone) ** ![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1154092381.jpg?width=348&height=27&name=file-1154092381.jpg) **[JetAir Drying Systems Utilize Pfannenberg Cooling for Soft Drink Bottler...](http://www.pfannenbergusa.com/jetair) ** ![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1154092381.jpg?width=348&height=27&name=file-1154092381.jpg) **[Cooling Units on Calcon Mobile Ozone Pumping Systems... ](http://www.pfannenbergusa.com/calcon)**![](https://blog.pfannenbergusa.com/hs-fs/hub/409956/file-1154092381.jpg?width=348&height=27&name=file-1154092381.jpg) **[Ocean Spray SDC Line Avoids Downtime with Pfannenberg...](http://www.pfannenbergusa.com/ocean-spray)** ## About Pfannenberg... *By keeping electronics in enclosures from overheating, Pfannenberg provides an invaluable service to companies, keeping their machinery and processes consistently operating.  By developing and producing products which are designed to save energy and other resources, Pfannenberg operates by their business philosophy – **Safety for man, machine and the environment*** ## News - [New 10-Year Warranty on Select Signaling Products](http://www.pfannenbergusa.com/news/article/current/2014/07/04/100033/new-10-year-warranty-on-select-signaling-products) - [Pfannenberg Named as one of WNY's Fastest Growing Companies](http://www.pfannenbergusa.com/news/article/current/2014/07/04/100032/pfannenberg-named-as-one-of-wnys-fastest-growing-companies) - [Pfannenberg, Inc. Announces Availability of New PWS 3000 Series Air to Water Heat Exchangers](http://www.pfannenbergusa.com/news/article/current/2014/07/04/100031/pfannenberg-inc.-announces-availability-of-new-pws-3000-series-air-to-water-heat-exchangers) [View All News...](http://www.pfannenbergusa.com/news) © 2012 Pfannenberg Incorporated | 716.685.6866