10 Things to Consider When Buying Oxidation Chiller Manufacturer and Supplier

Your company therefore needs a new chiller for your factory's manufacturing processes. How do you decide on the right chiller for you? Making the right decision can be a daunting task for any plant manager or engineer. You get it wrong and your plant and your job prospects could be in big trouble. Let's discuss some of the options you have at hand.

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Decision points when buying an industrial chiller

The first part of the buying process is deciding whether you need an air-cooled or water-cooled chiller. Now, if you are simply replacing or upgrading an old unit, you may be able to replace that unit with the same type of chiller. However, if you are dealing with a new installation, then you will need to look at your options.

Air cooled chillers vs water cooled chillers

The two most popular types of chillers are air-cooled or water-cooled. The "air" or "water" cooling name refers to the type of condenser used by the chiller to cool the refrigerant.

   Flooded Type Screw Type Chiller

Air Cooled Chillers

Custom screw chillers are the most commonly used chiller system because they are a self-contained system. No additional external components are required. These systems are less efficient than water cooled chillers but are more attractive because they are self-contained. Air-cooled scroll chillers are relatively easy to install and start up.

Water cooled chillers

Water cooled scroll chillers Water cooled chillers require an external cooling tower and cooling tower supply pump to cool the water cooled condenser. If your plant already has an existing cooling tower with excess capacity available, then this is the best option for you to consider. Once you have decided on an air-cooled or water-cooled chiller, you now have to make some more difficult decisions.

Comparing chillers - screw and scroll compressors

Screw vs. scroll compressors

If you are looking for a relatively small chiller (under 30 tonnes), you must buy a scroll chiller. If your cooling needs exceed 30 tons, you can make a decision. Do you use a scroll compressor or a screw compressor. When comparing screw and scroll chillers, there are several things to consider when making this decision.

 Modular Type Air Cooled Scroll Chiller

Scroll chiller compressors

Scroll compressors are limited in size. Although technology is constantly improving and increasing its size, the largest scroll compressor you can buy today is 40 HP. therefore, if you need a larger cooling load, you will need multiple compressors. While this may be a benefit, you need to ensure that you do not install multiple compressors on a single circuit. Doing so could lead to future service nightmares.

Scroll versus screw compressors

Scroll compressors fit into a good niche market. They are ideally suited to smaller process applications - especially when operating times are more dispersed (< 24 hours/day). We classify scroll units as medium-sized process chillers. Depending on the environment, scroll chillers can handle longer operating times.

If you plan to run your plant 24/7 and meet the load requirements (over 30 tons), we would always recommend an air-cooled screw chiller over a scroll system. Screw compressor systems offer better capacity control options, are fully serviceable and have a wider operating range.

Chiller Test Laboratory

Choosing the right evaporator for your chiller

Another consideration is the evaporator of your chiller. In any application over 20 tonnes we usually recommend a DX shell and tube evaporator on a brazed plate. Although the brazed plate evaporator is stainless steel with copper brazing, it does not handle fouling very well. To be honest, most manufacturing plants do not have clean water.

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Using with a shell and tube evaporator will give you a longer life and better durability. With the ability to manufacture shell and tube vessels using custom materials and thicker tube walls, evaporators can be used to handle direct cooling of corrosive or even aggressive liquids.

Heat is a common by-product of today's manufacturing machines, which include the advanced automation technology required for high-speed operation and high precision. Components such as spindle motors, variable frequency drives, lasers and X-ray sources all require cooling to operate properly and reliably - often in very harsh manufacturing environments.

As manufacturing space is at a premium and machine packages become smaller and smaller, liquid cooling has become the most efficient and cost-effective method of removing process heat. Particularly suited to hot, dirty environments, liquid cooling provides a way to remove heat from the machine without contributing additional heat back into the environment.

A quick guide to choosing the right chiller.

As every industrial environment is different, a 6-step guide to help you choose the right chiller for your application:

 Water Cooled Screw Chiller

Step 1: Determine the thermal load

It is important to determine the thermal load of your application to ensure that the chosen chiller is large enough for the intended application. There are a number of ways to determine the thermal load (in BTU's) but understanding the process is essential to calculating an accurate thermal load.

Step 2: Determine coolant type, temperature and flow rate

When the heat load is known, the next step is to determine the coolant, its target temperature and the flow rate that the cooler must provide for the process. This depends on the method of heat transfer from the process to the coolant and the type of coolant used. Water, for example, has different properties to oil.

Step 3: Determine the installation environment

In what environment is the chiller to be installed? For example, indoor applications may encounter hot and dirty environments, while outdoor installations may encounter cold and hot environments. This can affect the size of the chiller and require accessories such as air filters, oil tank heaters etc.

 Air Cooled Screw Chiller

Step 4: Using chiller performance curves

Now use the available chiller performance curves to select a chiller model that meets or exceeds the required capacity based on the chilled water supply temperature and the maximum expected ambient air temperature. Application safety margins associated with available rack sizes should be considered to maximise the value of chiller selection. Find all Brannenberg chiller performance curves in the Thermal Management catalogue.

Step 5: Check pump performance curves

Check the available pump performance curves to ensure that the pump is able to deliver sufficient pressure at the design flow rate to meet the application. Some liquid cooling systems have smaller coolant flow paths or longer distances, so pressure losses may be higher than average.

Step 6: Final selection

Finally, consider the remaining application requirements such as power characteristics, control options, footprint, list of mechanisms, colours, etc. that have been met by the selected Standard Brannenberg chiller. Choosing a standard chiller will give you greater reliability, easier access to universal spare parts service and global support.

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