--- title: "The Technology of Cooling: Cooling with Closed Loop Cooling Units" description: Pfannenberg offers key tips to know if a cooling unit is the right product for your application. image: https://blog.pfannenbergusa.com/hubfs/DTS_31X5_group_web.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: Cooling with Closed Loop Cooling Units](https://blog.pfannenbergusa.com/cooling-with-closed-loop-cooling-units) Posted by [Marine Vienney](https://blog.pfannenbergusa.com/author/marine-vienney) on Nov 20, 2015 3:02:00 PM - [Tweet](https://twitter.com/share)   **Pfannenberg Cooling Units operate on the principle of the Carnot cycle. This means that the cooling unit functions 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_31X5_group_web.jpg](https://blog.pfannenbergusa.com/hs-fs/hubfs/DTS_31X5_group_web.jpg?width=465&name=DTS_31X5_group_web.jpg "DTS_31X5_group_web.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 a NEMA Type 12 to 4x rating is required - closed loop systems can maintain the NEMA Type rating of the cabinet. **Properly sizing a cooling unit:** To properly size a cooling unit you must know the required cooling capacity in Watts, mounting requirements (side, integrated or top mount) and the dimensions of the unit and enclosure. ** {PC = PD - PR }**                     **      {PR = C x A x ∆T }** **> Pc [ Watt ]:                                   > C [  W/m2 °C ]: **Refrigeration capacity of a cooling unit.           **Coefficient of heat transmission.** **> PD [ Watt ]:                                   > A [  M2 ]: Dissipation Loss: **Thermal power                 **Surface area of electronics cabinet.** generated inside a cabinet by the dissipation loss of components.**                      ****> ∆T [ °C ]: **                                                       Difference in temperature between        **> PR [ Watt ]:  **                                the ambient air and the air inside the **Radiant heat gain/loss:** Heat transfer         electronics cabinet. through the skin of the enclosure (insulation factor not included).                            **Utilizing performance curves to properly size cooling units:** ![Cooling_Performance_Curve](https://blog.pfannenbergusa.com/hs-fs/hubfs/Cooling_Performance_Curve.jpg?t=1448038890511&width=297&name=Cooling_Performance_Curve.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. To properly size your Cooling Units you can also use Pfannenberg's [PSS Software ](http://www.pfannenbergusa.com/pss)which will guide you through the sizing process, to calculate the correct product for your application.   ## Important information when utilizing cooling units:![AirFlow](https://blog.pfannenbergusa.com/hs-fs/hubfs/AirFlow.jpg?t=1448038890511&width=350&name=AirFlow.jpg) - 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 unit‘s 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.   [Click here](http://www.pfannenbergusa.com/cooling_units) to discover our complete range of Cooling Units!   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/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? 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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