The shell and coil heat exchangers are constructed using circular layers of helically corrugated tubes placed inside a light compact shell. The fluid in each layer flows in the opposite direction to the layer surrounding it, producing a criss-cross pattern. The large number of closely packed tubes creates a significant heat transfer surface within a light compact shell. The alternate layers create a swift uniform heating of fluids increasing the total heat transfer coefficient. The corrugated tubes produce a turbulent flow where the desired feature of fluctuating velocities is achieved. This haphazard movement of fluid particles reduces deposit buildup by performing a “scoop and lift” action. The connection locations and angle of entry is specially selected to reduce the probability of debris buildup.
Shell and Coil Construction Features
The shell and coil tube series are manufactured as a single unit with no removable parts. The coiled tube bundles are welded to a compact tube sheet located within the entry and exit connections. The cylindrical shell is terminated by hemi-spherical heads. Designed with smooth tubes and 90 connections in flanged or NPT termination.
Advantages of the Shell and Coil Heat Exchanger
The shell and coil design is the perfect choice whenever high heat transfer rates, compact design and low maintenance costs are high priorities. Other benefits include:
- High Performance: the unique coil arrangement has a large heat transfer area meaning high heat transfer coefficients.
- Compact and Light-weight: closely packed tubes makes our shell and coil exchangers compact and lightweight. Small footprint makes it easy to install where space is limited and hard to access.
- Low Maintenance Costs: corrugated tube design produces a high turbulent flow, which reduces deposit build-up and fouling. This means longer operating cycles between scheduled cleaning intervals.
- Low Installation Costs: vertical installation makes it ideal for hydronic heating and cooling systems where space is an issue.
- Higher Temperature Differentials: helical design allows for higher temperatures and extreme temperature differentials without high stress levels and costly expansion joints.
- Flexible Designs: variety of model types and configurations allow shell and coil heat exchangers to be used with a wide range of pressures, temperatures, and flows.
- Low Pressure Drop
- Easy selection based on sub-station space requirements and heat or cooling load.
Units kept in stock for immediate delivery.
The shell and coil design were designed specifically for the hydronic markets including:
- Heating Systems
- Chilled Water Systems
- Ground Water Systems
- Residential Use
- District Heating Systems (heating systems that distribute heat from one or more heating sources to multiple buildings)