A wide variety of liquid temperature control equipment is produced by PolyScience. In most cases products are not designed for a particular application but are rather engineered to offer stable heating or cooling over common operating temperature ranges. Depending on the application, if you need to maintain a temperature below or near ambient temperature then a refrigerated product such as a circulating bath or a recirculating chiller is appropriate. The choice depends on a number of factors. The following guidelines help determine the type of product model best suited to one’s application.
- Fluid operating temperature range and set-point
- Cooling capacity (heat removal if set-point is near/below ambient)
- Ambient temperature (affects cooling capacity)
- Temperature stability (we offer choices from ±0.005°C to ±0.1°C)
- External application (open or closed-loop determines pump type)
- Reservoir size (if a bath is required)
- Pump pressure and/or flow rate (if pumping to an external application)
- External probe/programmability
Ambient Air Temperature
Due to air cooling, refrigerated products heavily rely on ambient air to remove heat from the refrigeration system, the ambient air temperature will affect a unit's cooling capacity. In general, while selecting a refrigerated product, decrease the product's cooling capacity rating at 1.3% for every 1° that the ambient air temperature exceeds 20°C. For instance, in case the ambient temperature where the circulator or chiller is located is 22°C, then the cooling capacity of the product will be reduced by 2.6%. At set-points close to the ambient temperature, heating products that lack refrigeration will have difficulty maintaining temperature and stability.
A typical circulating bath makes use of the ambient air to remove heat from the refrigeration system which, in turn, removes heat from the process fluid as shown in Figure 1.
Figure 1. Typical circulating bath
A typical air-cooled chiller makes use of the ambient air to remove heat from the refrigeration system which, in turn, removes heat from the process fluid.
Figure 2. Air cooled chiller
For almost five decades, PolyScience has responded to the needs of laboratory, chemical, medical, industrial, plastics and culinary markets with unparalleled innovation, passion, and user-focus.
PolyScience’s dedication to quality, ease of operation, and reliability has helped it to become a global company that spans six continents.The company’s refrigerated circulators, heated circulators, chillers, recirculating coolers, water baths and special-purpose products are designed to simplify tasks, take less space, integrate more seamlessly, and perhaps most important, make your work productive and enjoyable.
An ISO 9001 certified company, PolyScience has implemented the systems, processes, and procedures necessary to ensure the quality, performance, and reliability of every product and component it manufactures. The company deploys Lean Manufacturing techniques throughout its vertically-integrated operation to help ensure that every step of the manufacturing process meets ISO 9001 quality requirements.
This information has been sourced, reviewed and adapted from materials provided by PolyScience.
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