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Components for CO2 applications in Industrial Refrigeration

Components for CO2 applications in Industrial Refrigeration

Product catalog summary

Introduction
This document provides an overview of Danfoss Industrial Refrigeration products designed for CO2 applications, emphasizing design pressure requirements. It includes a table listing components suitable for CO2 applications with their maximum working pressure limits.

General Information about CO2
CO2 is a refrigerant with specific design pressure considerations, including operational, standstill, and safety valve tolerances. A common solution is using a separate refrigeration system to manage liquid CO2 temperature.

Design Pressure
Design pressure considerations include operational, standstill, and defrosting requirements. CO2 hot gas defrosting is efficient but requires high pressure, with a design pressure of 50-52 bar allowing a defrosting temperature of approximately 9-10°C.

Material Compatibility
CO2 affects polymers differently, necessitating modifications. It is compatible with most metals but can cause permeation and swelling in polymers. Danfoss conducts tests to ensure component compatibility with CO2.

Water in CO2 Systems
Water can enter CO2 systems through various means, and its content must be low to prevent freezing and equipment blockage. Driers are effective in removing water.

Safety Valves in CO2 Systems
Safety valves should not have outlet lines to prevent solid CO2 formation. Direct atmospheric release is recommended to avoid blockages.

Danfoss Sub-Critical CO2 Components
Danfoss offers a range of components for CO2 applications, with pressure as a limiting factor. Components are CE approved and comply with the Pressure Equipment Directive, with special high-pressure components available upon order.

Key Components
Components include solenoid valves, motor valves, multifunction valves, stop valves, regulating valves, filters, check valves, and safety valves, each with specific pressure and temperature ratings.

Valve Types and Specifications

Stop Check Valves: Sizes range from 15 mm to 100 mm with a maximum working pressure of 52 bar for most sizes.
Regulating Valves: Available in various sizes with a consistent maximum working pressure of 52 bar.
Check Valves: Sizes range from 15 mm to 125 mm, with working pressures similar to stop check valves.
Filters: Sizes from 15 mm to 200 mm, with a maximum working pressure of 52 bar for smaller sizes.
Overflow Valves: Sizes 20 mm and 25 mm, with adjustable differential pressure between 2-8 bar.
Stainless Steel Valves: Designed for high-pressure applications up to 52 bar.

Connection Types

D: Butt weld DIN connection
ANSI: Butt weld ANSI connection
STR: Straightway
ANG: Angleway
CAP: Cap
H-WHEEL: Hand wheel

Ordering Information
The document provides specific code numbers for each valve type and size, facilitating accurate ordering. Some components, like filter inserts, need to be ordered separately.

Conclusion
This document serves as a comprehensive guide for selecting and ordering industrial refrigeration valves for CO2 applications, detailing specifications, connection types, and ordering codes to ensure compatibility and performance in high-pressure environments.

Specifications

ICS 25 Valves: Available in configurations with 1 or 3 pilots, suitable for different pressure ranges.
Hot Gas Defrost Valves: Includes CVPP (HP) and CVP (XP) types with maximum working pressures of 40 bar and 52 bar respectively.
Solenoid Valves: Stainless steel valves available in sizes ranging from 3/8 inch to 1 inch, with a maximum working pressure of 52 bar.
Coils: Available for different voltage requirements, including 110 V, 24 V, and 230 V AC.
Pressure Transmitters: AKS 3000 series with a pressure range of 0 to 60 bar.

Ordering Information

Complete factory-assembled valves can be ordered, including body, function module, and top cover.
High-pressure specials are available but may require extended delivery times.

Components and Materials

High-Pressure Steel Connectors: Various sizes available, with a maximum working pressure of 46 bar.
Core Materials: Solid cores made from molecular sieves and Al3O2.

Company Information
Danfoss is a global leader in refrigeration and air conditioning solutions, focusing on quality products that enhance performance and reduce life cycle costs. They offer a wide range of components and systems backed by technical and business solutions to help reduce costs and streamline processes.

Catalog excerpts

Components for CO2 applications in Industrial Refrigeration-1

MAKING MODERN LIVING POSSIBLE Application Guide Industrial Refrigeration Components for CO2 applications www.danfoss.com/ir

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Components for CO2 applications in Industrial Refrigeration-3

Industrial Refrigeration Valves for CO2 Applications Contents Page Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 General information about CO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Design pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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Components for CO2 applications in Industrial Refrigeration-4

Industrial Refrigeration Valves for CO2 Applications 2 DKRCI.PA.000.D3.02 / 520H0243 Danfoss A/S (AC-MCI/MWA), 2012-03

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Components for CO2 applications in Industrial Refrigeration-5

Industrial Refrigeration Valves for CO2 Applications Introduction The objective of this application guide is to provide an overview of which Danfoss Industrial Refrigeration products are suitable for use in CO2 applications. For further background information about CO2 as a refrigerant, please refer to the Danfoss article "CO2 Refrigerant for Industrial Refrigeration". Today, Danfoss is offering a broad programme of industrial products applicable for CO2, however this is dependent on demands regarding the design pressure. The table on page 8 lists the components which are suitable for CO2 applications...

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Components for CO2 applications in Industrial Refrigeration-6

Industrial Refrigeration Valves for CO2 Applications Material compatibility CO2 is compatible with almost all common metallic materials, unlike NH3. There are no restrictions from a compatibility point of view, when using copper or brass. The compatibility of CO2 and polymers is much more complex. As CO2 is a very inert and stable substance, the chemical reaction with polymers is not critical. The main concern with CO2 is the physiochemical effects, such as permeation, swelling and the generation of cavities and internal fractures. These effects are connected with the solubility and diffusivity...

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Components for CO2 applications in Industrial Refrigeration-7

Industrial Refrigeration Valves for CO2 Applications Water in CO2 systems In NH3 systems it is well known that there are problems as a result of reaction with oil, oxygen, water and solid contaminations, but these are all handled today by frequent oil changes and use of air purgers. Compared to NH3 CO2 is less sensitive, but if water is present, problems may occur. How can water penetrate into a CO2 system? • The pressure of CO2 systems is always above the atmospheric pressure, therefore there are not the same risks as in e.g. NH3 systems, of air/water penetration into a leaking CO2 system. However,...

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Components for CO2 applications in Industrial Refrigeration-8

Industrial Refrigeration Valves for CQ2 Applications Water solubility in vapour C02 Water solubility in vapour phase In fig. 2, the maximum water content, which can be dissolved in the C02 gas phase, is compared with other commonly used refrigerants. The maximum water content for CO, is much lower than forthe other refrigerants. If the maximum concentration is exceeded, this will appear as free water or as ice in the refrigeration system. Danfoss Sight Glass Type "SGN" in liquid C02 An indication of water content can be obtained by using a Danfoss SGN sight glass. - A "dry" system is shown with...

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Components for CO2 applications in Industrial Refrigeration-9

Industrial Refrigeration Valves for CO2 Applications Water in CO2 systems (cont.) Principle diagram: CO2-NH3 cascade system Dry suction CO2 Compressor Filter drier CO 2 - NH 3 heat exchanger CO2 reciever CO2 Evaporator Moisture indicator Liquid Filter driers installed in: • bypass lines or • main liquid line Filter drier Moisture indicator Liquid Fig. 4: CO2 systems with DCR filter drier and SGN indicator Safety valves in CO2 systems Due to the thermodynamic properties of CO2, in particular the triple point, which is located at much higher pressure than for all other common refrigerants, the...

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Components for CO2 applications in Industrial Refrigeration-10

Industrial Refrigeration Valves for CO2 Applications Danfoss sub-critical CO2 components Today, Danfoss is offering a broad programme of industrial components applicable for CO2. common types of valves are listed on the following pages. The majority of components listed below have been evaluated and upgraded, and are therefore applicable for CO2 within the pressure and temperature range stated in the technical documentation. In particular the pressure is the limiting factor for this group of components. Please note the high pressure specials are generally available to order only and extended...

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Components for CO2 applications in Industrial Refrigeration-11

Industrial Refrigeration Valves for CQ2 Applications Danfoss sub-critical C02 Commercial Refrigeration products The product can be used in standard version.

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Components for CO2 applications in Industrial Refrigeration-12

Industrial Refrigeration Valves for CO2 Applications Coils for solenoid valves Due to the high pressure difference between the condenser and evaporator, the Maximum Opening Pressure Differential (MOPD) demand for the solenoid valve in some applications may exceed the standard coil capabilities. Typical applications could be: Liquid injection for cooling the compressor Hot gas defrost Shut off valve before expansion valve Therefore Danfoss offers a 20 W coil, that covers a MOPD range up to 40 bar. The 20 W coil program includes 24, 110 and 230 V a.c. 50 Hz power supplies. Pilot valve type CVP...

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Components for CO2 applications in Industrial Refrigeration-13

Industrial Refrigeration Valves for CO2 Applications Pressure transmitters AKS 3000 is a series of absolute transmitters with high-level signal conditioned current output, developed to meet demands in A/C and refrigeration. All materials in contact with the refrigerant and materials for the housing are AISI 316L stainless steel. No soft gaskets, all environmental sealings are made through laser weldings only. AKS 3000 utilises the proved piezoresistive measuring principle, which has been used for decades in Danfoss pressure transmitters. AKS 3000 has a 4 to 20 mA output, and is available with...

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Components for CO2 applications in Industrial Refrigeration-14

Industrial Refrigeration Valves for CO2 Applications Eliminator ® liquid line filter driers Eliminator ® liquid line filter driers protect refrigeration and air-conditioning systems from moisture, acids, and solid particles. With these contaminants eliminated, systems are safer from harmful chemical reactions and from abrasive impurities. For further information regarding DCR filter driers please contact your local Danfoss sales company. Benefits, features and facts Excellent moisture and acid adsorption protects your refrigeration system Highly efficient dirt retaining capabilities on both the...

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