INNOVATIVE SHELL-AND-TUBE HEAT EXCHANGERS
For shell-and-tube evaporators, thermal performance and pressure drop are considered as major factors that are directly related to operating costs and overall chiller efficiency. Both thermal performance and pressure drop are dependent on the flow paths and types of baffles used to increase the fluid velocity – by diverting the flow across the tube bundle to obtain higher heat transfer coefficients.
The shell-and-tube evaporators used in Lightstream Screw-V chillers feature both high heat transfer performance, close approach temperatures, as well as low pressure drops, as it combines an innovative tube bundle design and optimized baffle geometry. The net result is improved system performance, as well as tight control of return water temperatures.
Lightstream Screw-V chillers can be equipped with factory-installed variable or fixed-speed pumps. The pumps feature reduced life-cycle costs, optimized efficiency, and high standard of corrosion protection thanks to cataphoretic coating. Variable-speed pumps have a broad performance range, which enables them to perform efficiently under widely varied conditions and to meet a wide range of requirements.
Based on the required performance, customers may select from inline – single or twin – or end-suction pumps installed in soundproof enclosures.
Chillers can be configured for constant or variable flow depending on a configuration of chilled water system. For the systems with a primary-only circuit, constant pressure differential or constant temperature differential flow control can be selected, while constant temperature differential control is available for primary/secondary systems. Flow control logic dynamically adjusts the pump speed based on the actual load, thus optimizing pump energy consumption and ensuring the stable operation of the chilled water plant.