Steam ejectors have been employed for removing air from steam surface condensers since the beginning of the Industrial Revolution and the advent of steam power. They are the simplest, most reliable method known of pumping gases. In the air removal application for the power industry, ejectors and condensers are employed to evacuate air and any other non-condensable gases from the steam spaces of the condenser that services a steam turbine. Gas removal is done for the purpose of eliminating the “insulating” effect that non-condensable gases have on the transfer of heat through the tubes to the cooling medium. Without a vacuum system, air leakage would severely reduce the efficiency of the heat transfer process resulting in the condenser surface area increasing many times for a given steam load. Show Unique Systems is an industry leader providing Air Removal Systems for the Power Generation market. With innovations such as our patented Quickcheck® Ejector design and a diverse array of integrated system packages, we offer the experience needed to solve complex requirements for this application. Unique Systems draws on more than 100 years of combined process vacuum experience which provides the foundation for our designs. We offer a full range of HEI venting equipment with capacities of 2-70 SCFM for steam surface condensers and hogging capacities of 25-3,500 SCFM and larger. For wet surface applications we offer many years of experience for standard venting capacities per HEI. For air cooled condensers we thoroughly understand the design challenges for a different set of conditions, such as high vapor loads and high turbine back pressure operation. Among our innovative vacuum system features:
Many types of heating, cooling and refrigeration systems rely on refrigerants to transfer heat.[1] They can be essential to how the refrigeration process works in such equipment.[2] But did you know refrigerants have some known enemies in an HVAC system? Any air, water or nitrogen in the unit can prevent the refrigerant from doing its job correctly and cause damage to the equipment.2 The only other substance that can exist in the system is oil.2 The problem for HVAC technicians is that these substances are always trying to sneak into equipment. Fortunately, there’s a solution: refrigerant evacuation.2 Learn what refrigerant evacuation is, when to use the process and why it’s important in this article. What Is Refrigerant Evacuation?Refrigerant evacuation is the removal of moisture, air and non-condensable gases from a refrigeration system.[3] During this process, a vacuum pump is used to draw the sealed HVAC system into a vacuum. This removes air, nitrogen and moisture from the unit.[4]
Fill out our form to learn how we can help you change your life. The removal of these substances occurs in two stages: Degassing Stage
Dehydration Stage
When Is Refrigerant Evacuation Necessary?
There are a few instances when an HVAC technician may need to evacuate water, air and other unwanted substances from a system:
Why Is Refrigerant Evacuation Important?Contaminants in an HVAC system can prevent the equipment from working properly and result in premature failure. Following are some of the specific issues that can arise: Non-Condensable Gases
Non-condensable gases in a system take up space, limiting the refrigerant’s ability to condense. This reduces the efficiency of the unit and forces the HVAC compressor to work harder.[8] Moisture
What Are Some Keys to Successful Refrigerant Evacuation?Taking certain measures can help make for a successful refrigerant evacuation:
The goal of these practices is to keep the system clean, sealed and dry.
Keeping an HVAC System Clean and SealedAs you can see, a lot can go wrong when contaminants like air, water or nitrogen infiltrate an HVAC system. The good news is you can evacuate them from the unit and restore it to proper functioning. Just make sure to adhere to best practices for installation and repair and avoid shortcuts. However, contaminants aren’t the only issue HVAC techs can face when working with refrigerants. Check out What to Know About Refrigerant Leaks to learn more. [1] https://theengineeringmindset.com/how-do-refrigerants-work/ [2] https://www.achrnews.com/articles/90651-tech-basics-system-evacuation [3] Title: Fundamentals of HVAC; Authors: Carter Stanfield and David Skaves; Air-Conditioning, Heating, and Refrigeration Institute; Second Edition; Textbook page 1472 [4] https://www.achrnews.com/articles/140808-how-to-properly-evacuate-refrigerant [5] http://www.geothermaluniversity.com/resources/10-evacuating-a-refrigeration-system.html [6] https://www.achrnews.com/articles/135554-properly-diagnosing-the-need-for-a-system-evacuation [7] http://c03.apogee.net/contentplayer/?coursetype=geo&utilityid=oge&id=6733 [8] https://highperformancehvac.com/hvac-refrigeration-evacuation/ |