Alfa Laval DH

Category - Tubular heat exchangers

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Our Our product profile contains a wide range of equipment of the Alfa Laval. Alfa Laval manufactures powerful and creative goods that always find the solution for the tough industrial problems at any time. The Alfa Laval achieves the high standards of equipment performance while creating the modern technologies that strengthen the working cycle of the industries. The Alfa Laval Alfa Laval DH is one of the flawlessly developed equipment. Alfa Laval Alfa Laval DH presents high degree of precision, which offer wide range of automatic and electric resolutions to fulfill all application needs. Because of the high quality of constituents, Alfa Laval Alfa Laval DH secure long term functioning.
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Description

The Alfa Laval DH is a two-pass dry expansion evaporator for commercial and industrial refrigeration cooling applications with evaporation temperatures ranging from 0°C to +10°C. DH can be used with HCFC and HFC refrigerants at medium and high pressures (30 - 45 barg). Capacity range 18 - 1500 kW. PED/CE, ASME, EAC, SELO, DNV and other major marine approvals are available. The Alfa Laval DH replaces the Alfa Laval Dryplus-3 product line for positive evaporation temperature applications (>0°C). Commercial and industrial refrigeration applications The Alfa Laval DH dry-expansion evaporator has been developed for commercial and industrial refrigeration cooling applications, such as air conditioning or industrial process cooling. These applications typically require an evaporation temperature in the range of 0°C to +10°C, depending on the system efficiency. The DH dry-expansion evaporator will replace the Dryplus-3 evaporator. Innovative dry-expansion evaporator The innovative Alfa Laval DH dry-expansion evaporator has a unique patented refrigerant distribution system, which has been optimized for R407F/C and R410A refrigerants. It can also be used with R134a as well as other HFC/HFO refrigerants. The new plastic baffle design improves the shell-side heat transfer performance. Thanks to these innovations, the new Alfa Laval DH evaporator offers the same capacity as the Alfa Laval Dryplus-3 model but is up to 30% shorter in length. Easy cooling and refrigeration

Easy to upgrade to the new Alfa Laval DH dry-expansion evaporator from the Alfa Laval Dryplus-3
Easy to select thanks to the Alfa Laval smarTube software, a calculation tool for thermal sizing
Easy to buy at any time thanks to easy access through the Alfa Laval e-business portal: contact Alfa Laval local sales organization to get the login
Easy to receive prompt service thanks to a high level of support
Easy to handle and stock thanks to its compact design (Length is up to 30% shorter than the Alfa Laval Dryplus-3)
Easy to install and decommission thanks to the low refrigerant charge
Easy to reduce the environmental impact with CO2 emission levels that are 25% lower than the Alfa Laval Dryplus-3

High performance cooling and refrigeration The Alfa Laval DH dry-expansion evaporator is a perfect mix of high performance and high quality at a competitive price. High performance

Innovative plastic baffles to improve the shell-side heat transfer performance
One unit handles various refrigerants: R407F, R407C, HFC/HFO, R134a and R410A
Unique patented refrigerant distribution system optimized for R407F/C and R410A

High quality

Corrosion reduction thanks to innovative plastic baffles
High level of technical support and qualified expertise from quotation through to after-sales support and service

Options

ASME, EAC, SELO, DNV and other major marine approvals available upon request
Mounting feet (recommended)
Flanges and victaulic flanges
Removable tube bundle
Insulation
Tubes in CuNi 90/10, AISI 316L and carbon steel
Shell in AISI 316L
High pressure version for R410A (45 bar)

How it works Operating principle The Alfa Laval DH dry-expansion evaporator is basically a heat exchanger that uses the shell-and-tube principle to achieve the desired effect. It consists of a pressure vessel (the shell) with a bundle of tubes inside it. The primary fluid (the refrigerant) flows through these tubes, while the secondary fluid (usually water or anti-freeze brine) flows over the tubes (through the shell) in order to bring about heat transfer from one fluid to the other. The standard tube bundle consists of copper inner-finned tubes. The Alfa Laval DH dry-expansion evaporator is designed for use as one component in cooling systems that consist of a compressor, a condenser, an evaporator and an expansion valve. The two-phase refrigerant arrives at the evaporator from the expansion valve. It then flows inside the tubes and evaporates as it absorbs heat from the surrounding secondary fluid, which is cooled as a result of the heat loss. The final part of the tube run is used to superheat the refrigerant in order to transform the refrigerant fluid into vapour form before it arrives at the compressor in order to ensure the most efficient cooling possible. Specially designed baffles are used on the shell side in order to boost heat transfer efficiency further. ''