Question:
Scraped surface heat exchangers are designed for the evaporation of which of the following type of products ?
Scraped surface heat exchangers are designed for the evaporation of which of the following type of products ?
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Scraped Surface Heat Exchangers (SSHE) are essential for processing highly viscous dairy foods (like ice cream mix, process cheese, or condensed whey) to prevent fouling on the heat transfer surfaces.
Updated On: Jul 21, 2026
- Low density product
- Medium surface tension product
- High viscous product
- Low specific heat product
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Standard heat exchangers (such as plate or tubular designs) can fail when processing highly viscous or sticky dairy products because the product forms a thick layer on the heating surface.
This layer reduces heat transfer and can cause scorching (burn-on).
Step 2: Detailed Explanation:
A Scraped Surface Heat Exchanger (SSHE) is designed to handle products that are highly viscous, sticky, or contain particulates.
The SSHE consists of a jacketed cylinder with a central rotating shaft equipped with scraper blades.
As the highly viscous product passes through the cylinder, it comes into contact with the heated inner wall.
The rotating blades continuously scrape the product off the wall.
This mechanical action:
- Prevents the product from burning onto the surface.
- Increases turbulence, which improves the rate of heat transfer.
- Ensures uniform heating or cooling throughout the product.
SSHEs are commonly used in the dairy industry for concentrating whey, processing processed cheese, and freezing ice cream.
They are not required for low-viscosity, low-density, or low-specific-heat products, which can be easily processed in standard plate heat exchangers.
Step 3: Final Answer:
Scraped surface heat exchangers are designed for processing High viscous products.
Standard heat exchangers (such as plate or tubular designs) can fail when processing highly viscous or sticky dairy products because the product forms a thick layer on the heating surface.
This layer reduces heat transfer and can cause scorching (burn-on).
Step 2: Detailed Explanation:
A Scraped Surface Heat Exchanger (SSHE) is designed to handle products that are highly viscous, sticky, or contain particulates.
The SSHE consists of a jacketed cylinder with a central rotating shaft equipped with scraper blades.
As the highly viscous product passes through the cylinder, it comes into contact with the heated inner wall.
The rotating blades continuously scrape the product off the wall.
This mechanical action:
- Prevents the product from burning onto the surface.
- Increases turbulence, which improves the rate of heat transfer.
- Ensures uniform heating or cooling throughout the product.
SSHEs are commonly used in the dairy industry for concentrating whey, processing processed cheese, and freezing ice cream.
They are not required for low-viscosity, low-density, or low-specific-heat products, which can be easily processed in standard plate heat exchangers.
Step 3: Final Answer:
Scraped surface heat exchangers are designed for processing High viscous products.
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