PolyScience is a leading producer of constant temperature control equipment. Since 1963, they have been providing innovative temperature control solutions for customers world-wide
Best Lab Partner
Available in 40 different models, the latest generation PolyScience cooling circulating water bath uphold the reputation for innovation, product quality and refrigeration expertise. The units are extremly simple to operate, easy to install and maintain, and wil provide years of reliable and accurate heat removal.
- Easy to Maintain
- Energy saving
A versatile range of products to fit every need !.
Capable of reaching temperatures as low as -40C a Polyscience cooling circulating water bath provides dependable temperature control for a wide variety of laboratory cooling applications
- Working temperatures from -40 to +200C
- Temperature stabilities to +/- 0.005C
- Capacities from 7 to 45 liters
- Six controller types with large, intuitive displays and multiple communication options
- Large bath openings and easy to clean surfaces
- Swivel 180 Rotating Controllers
- LidDock lid stowing system
- DuraTop Chemical resistant deck
- WhisperCool Environmetal Control System
- Cool Command Technology
Selecting a Cooling Circulating Water Bath
Chillers provide heat removal for a wide variety of processes and equipment. When properly sized and slected, a cooling circulating water bath increases production speed and accuracy, protects valuable process equipment and reduces water consumption and related costs. If it is undersized, it will be inefficient due to excessive cycling. In addition to having an adequate cooling capacity, the chiller must deliver the cooling fluid at the proper pressure and flow rate:
The are four basic factors that affect a cooling circulating water bath sizing and selection:
1. Desired Coolant Temperature
This is the coolant temperature at the inlet of your process or equipment. It is important to measure the temperature at this point to allow for coolant heating as it travels from the chiller to the process. The longer the distance to be covered, the higher the potential heat gain. This heat gain can be minimized by insulating the cooling line and positioning the chiller as close as practical to the equipment or process being cooled.
2. Heat Load
This is the amount of heat that needs to be removed. It is usually expressed in BTUs/hour or watts. The heat load value is often provided by the equipment manufacturer. If not, it can be calulated using the following formula:
Heat load = Flow rate x Fluid Density x Fluid Specific Heat x Constant x d°C
d°C = the difference between the inlet and outlet temperatures of the equipment being cooled.
3. Coolant flow and pressure
These parameters are normally provided by the equipment manufacturer and are a function of the surface area and the heat transfer characteristics of the process/material being cooled. It is crucial that your chiller deliver coolant at the proper flow rate and pressure. If the flow rate or pressure is too high, the equipment being cooled may be damaged. If it is too low, the heat removal will be inadequate. Prolyse BV can help you specify the type and size of coolant pump most suitable for your needs.
4. Condenser heat dissipation
The final factor influencing chiller/heat exchanger selection is how the heat removed will be dissipated. Chillers with air-cooled condensors exhaust heat into the surrounding air and require only power and ventilation for operation. Chillers with water-cooled condensors transfer heat to the facility’s cooling water supply.
5. Suggested Chiller Fluid
The most common and acceptable coolant is a mixture of 50% distilled water and 50% ethylen glycol (polycool EG-25). This combination will provide the best results for set-point temperatures between -25°C and +80°C. Although ethylene glycol is not required for set-point temperatures above freezing (0 °C). It is highly recommended as glycol helps lubricate pump seals and fluid temperatures inside the chiller may be below freezing.