Liquid Nitrogen

Liquid Nitrogen Generators

MVS Engineering brings you the best liquid nitrogen generation systems in the world in collaboration with the leaders in the field of cryogenics – Stirling Cryogenics (Netherlands) and Cryomech (USA). We are pleased to offer two distinct technologies and thereby allowing us to offer the solution most suited for serving the needs of our customers.

Stirling Cryogenics

Stirling Cryogenics is the world’s leading specialist in stand-alone cryogenic cooling systems. This is because of the success of their Stirling cryogenerator (reversed Stirling cycle based crycooler). Stirling Cryogenics developed the Stirling Cycle Cryogenerator almost 60 years ago and it has been the cornerstone of their cooling systems ever since.

Cryomech USA developed and produced the world’s first commercially available 4K Pulse Tube Cryocooler (PTR). They also manufacture the largest variety of single-stage Gifford-McMahon Cycle Cryocooler available anywhere.
Cryomech was founded in 1963 by Professor William E. Gifford, the inventor of the Gifford-McMahon Cycle and the Pulse Tube Cycle.

Stirling Cryogenics – 70 to 3600 Liters/Day

Stirling Cryogenic’s StirLIN products consist of a wide range of liquid nitrogen liquefiers producing LN2 in volumes from 3 up to 150 liters per hour (70 to 3,600 liters per day).MVS supplied Liquid Nitrogen Generators are the preferred solution for customers looking to install a plug and play, ready to produce system. These generators occupy very little space, use electrical power for its operation and produce Liquid Nitrogen on-site. using electrical power, taking up little space.

Specifications and advantages

The functionality and specifications of the StirLIN range and the advantages of StirLIN liquid nitrogen liquefaction system:

Ease of installation
Fully automatic operation by PLC control
Extendible LN2 production capacity
Adjustable liquid nitrogen pressure
Efficient production by using the StirLIN cycle
Easy liquid nitrogen dispensing
Low noise level
No Defrosting / Purging is required
1st drop of liquid nitrogen within 10 minutes
Auto re-start
Remote monitoring facility (optional)
Built for Indian Climatic Conditions

How Liquid Nitrogen Generator Works

The central element in all equipment of the Stirling Cryogenics brand is the Stirling Cycle Cryogenerator. The Stirling Cycle is remarkable because it is a closed cycle in which the Cryogenerator’s internal working gas (He) never comes into contact with the fluid to be cooled; they connect only by flow of heat through the heat-exchanger wall. This concept eliminates contamination of the customers process as well as of the Stirling Cycle working gas, resulting in long continuous operating periods and longevity.
The Stirling Cycle alternately compresses and expands a fixed quantity of helium in a closed cycle. The compression takes place at room temperature to facilitate the discharge of heat caused by compression, whereas the expansion is performed at the cryogenic temperature required by the application.

Technology History

The Stirling cycle is a thermodynamic closed cycle invented in 1816 by the Scottish minister Robert Stirling. It was used as an engine and was considered at the time to be capable of replacing the steam engine since their steam boilers were prone to life-threatening explosions. The counterpart of the Stirling engine, the refrigerator, was first recognized in 1832. Both machines experienced high and low points during the nineteenth century. The principle behind the machines was almost condemned to obscurity after the invention of the internal combustion engine (gas-, petrol-, and diesel motors) and compressor refrigerators with external evaporation.
In 1946 Philips started optimizing the Stirling cycle to be used for cryogenic cooling. The result was the development of the world conquering Stirling Cryogenerator, marking the start of significant cryogenic activities at Philips. Though the Stirling engine itself never became a commercial success, the Stirling Cryogenerator has been selling by thousands worldwide and has been incorporated in equipment and projects used from Antarctica to the North Pole.

Your own reliable cold source

With a Stirling Cryogenerator you’ve got your own reliable and efficient cold source. Stirling Cryogenics is committed to making you fully self-supporting. No longer will you be dependent on the bulk supply of liquid gas. No longer will you waste expensive evaporated gases. Simply create a cold spot in your process, liquefy the gas required or recondense coolant gas in a closed-loop system. Stirling Cryogenics always has the right cooling solution for the job and the global service network to support you.

Extreme cold anywhere, anytime

Stirling Cryogenics developed the Stirling Cycle Cryogenerator almost 60 years ago and it has been the cornerstone of our cooling systems ever since. The Stirling Cryogenerator makes it possible for our systems to produce temperatures ranging from 200 K (-75°C) down to 15 K (-258°C). Businesses, industries, hospitals and research centers all over the world rely on our expertise to provide them with a reliable, on site, supply of gases and liquids for cooling purposes. A Stirling Cryogenics cooling system is an indispensable piece of equipment in those situations where constant cryogenic cooling is crucial.

Stirling Efficiency

The Stirling Cryogenerator is extremely efficient compared to other cryogenic cooling principles Carnot efficiency is 30% at 77K, resulting in a high practical over-all efficiency defined as Watts of cooling power available to the application divided by kW of electric input power. Depending the application’s temperature, the over-all efficiency of the Stirling Cryogenerator varies between 10% for LN2 applications to over 20% for LNG systems.

MODELS

StirLITE
Liquid nitrogen production	2.9 to 3.5 Liters/hr
Liquid nitrogen production	70 to 84 Liters/day
Liquid nitrogen purity	99% at 1 bar(g)
System Size (l x w x h mtrs)	2.10 x 2.30 x 2.15
Storage capacity	200L
Noise (dBA)	72

StirLIN-1 Economy
Liquid nitrogen production	5.8 to 7.0 Liters/hr
Liquid nitrogen production	140 to 168 Liters/day
Liquid nitrogen purity	99% at 1 bar(g)
System Size (l x w x h mtrs)	2.10 x 2.30 x 2.15
Storage capacity	300L
Noise (dBA)	72

StirLIN-1 Compact & StirLIN-1 Extendible
Liquid nitrogen production	11.5 to 16.5 Liters/hr
Liquid nitrogen production	276 to 396 Liters/day
Liquid nitrogen purity	99% at 1 bar(g)
System Size (l x w x h mtrs)	Compact 2.10 x 2.30 x 2.15
System Size (l x w x h mtrs)	Extendible 3.50 x 3.50 x 1.80
Storage capacity	Compact 500L
Storage capacity	Extendible 1000L
Noise (dBA)	72

StirLIN-2
Liquid nitrogen production	23 to 33 Liters/hr
Liquid nitrogen production	552 to 792 Liters/day
Liquid nitrogen purity	99% at 1 bar(g)
System Size (l x w x h mtrs)	3.50 x 3.50 x 1.80
Storage capacity	1000L
Noise (dBA)	74

StirLIN-4 & StirLIN-4-Extendible
Liquid nitrogen production	48 to 75 Liters/hr
Liquid nitrogen production	1152 to 1800 Liters/day
Liquid nitrogen purity	99% at 1 bar(g)
System Size (l x w x h mtrs)	4.90 x 3.65 x 2.00
System Size (l x w x h mtrs)	Extendible 4.90 x 4.35 x 3.00
Storage capacity	2000L
Noise (dBA)	72

StirLIN-8
Liquid nitrogen production	97 to 151 Liters/hr
Liquid nitrogen production	2328 to 3624 Liters/day
Liquid nitrogen purity	99% at 1 bar(g)
System Size (l x w x h mtrs)	4.90 x 4.35 x 3.00
Storage capacity	2000L
Noise (dBA)	74

Cryomech – 10 to 240 Liters/Day

Cryomech Liquid Nitrogen Plants center their robust and versatile design on the principles of the Gifford-McMahon Cryocooler. The modular system comes fully integrated with an on-site gas generator from MVS Engineering.

At a small scale, the system is designed to be mobile and fit into most user locations, regardless of space or environmental restrictions.

Most maintenance can be performed in the field with minimal technical training. The systems are designed for long durations of use between service intervals.

Robust Features

Cryomech systems offer a variety of robust features that make them the preferred system for most customers, including:

Cryocoolers and compressors are built at their own factory in USA
Cryomech’s founders were the inventors of the Gifford-McMahon (GM) cycle technology
Fully automatic operation with single push button start
Automatically enters into standby mode when the production dewar is full
Dewar sizes 35-500 Liters
Cryogenically insulated extraction line and valve for low loss Liquid Nitrogen transfer
Long operation service in between maintenance intervals
Most maintenance can be conducted by in-house operation personnel of the client
Long life of components with very high availability rate
Plug and play design. In most cases, customer only needs to provide electrical power and the system can be made operational in a few hours

HOW IT WORKS

All Cryomech Liquid Nitrogen Plants work with exactly the same group of components.

There needs to be a supply of nitrogen gas. Nitrogen makes up 78% of the air we breathe and can be separated from the rest of air’s components. Gaseous Nitrogen is produced from systems manufactured in India by MVS Engineering.

There is a storage vessel for the LN2. A dewar is a vacuum insolated vessel designed to store very, very cold liquids.

Gaseous Nitrogen from the MVS system is taken to a cryorefrigerator to condense the nitrogen gas inside the dewar into liquid. The source of Cryomech’s expertise is in the manufacture of Cryorefrigerators (Cryocoolers). Cryorefrigerators are machines that remove heat down to temperatures below 120K (-153° C).

The Cryomech Cryorefrigerator consists of a pair of stainless steel flexible helium lines, a helium compressor package and a cold head. The cold head is installed directly at the very top of the dewar in which the liquid nitrogen is to be collected. From the top, the cold head extends to the neck of the dewar to cool down the nitrogen to 77K (-196°C) that enters the dewar. Nitrogen gas changes its state to liquid when it comes in contact with the cold head heat exchanger. The liquefied nitrogen drips down from the heat exchanger into the dewar. The pressure inside the dewar gets typically lower in this process, but the regulator lets in more nitrogen in the dewar to maintain the pressure at the predefined level. In the dewar, the flow rate of nitrogen gas is regulated by the rate of liquefaction.

History

Founded in 1963 by Professor William E. Gifford, Cryomech is a world leader in compact liquid nitrogen and other cryogenic products. The founder of Cryomech is also famously known as the co-inventor of the Gifford-McMohan Cycle and the Pulse Tube Cycle. The first Liquid Nitrogen plant – the LNP40 was developed in the year 1992. Dr. Chao Wang developed the first commercially available 4K Pulse Tube Cryocooler in 1999. In 2007, Cryomech introduced the LHeP12 and 20 Liquid Helium Plants. In 2010, the first Cryomech Helium Recovery System was installed. In 2013, Cryomech developed the 1K Cryostat and released its second-generation Liquid Helium Plants with increased liquefaction rates and remote monitoring.

MODELS

10 LPD
Liquid nitrogen production	10 Liters/day
Cryocooler	AL60
Dewar size	35 L
Helium Compressor Model	CP102
Cooling	Air cooled or water cooled

20 LPD
Liquid nitrogen production	20 Liters/day
Cryocooler	AL125
Dewar size	100 L
Helium Compressor Model	CP103
Cooling	Air cooled or water cooled

40 LPD
Liquid nitrogen production	40 Liters/day
Cryocooler	AL200
Dewar size	160 L
Helium Compressor Model	CPA2850
Cooling	Air cooled or water cooled

60 LPD
Liquid nitrogen production	60 Liters/day
Cryocooler	AL300
Dewar size	210 L
Helium Compressor Model	CPA2870
Cooling	Air cooled or water cooled

120 LPD
Liquid nitrogen production	120 Liters/day
Cryocooler	AL600
Dewar size	300 L
Helium Compressor Model	CPA1114
Cooling	Water cooled

240 LPD
Liquid nitrogen production	240 Liters/day
Cryocooler	AL600 x 2
Dewar size	500 L
Helium Compressor Model	CPA1114 x 2
Cooling	Water cooled

* These are typical specs and can be customised to match customer specific requirements

FAQ’S

Which system is better suited for us – Stirling Cryogenics or Cryomech?

Stirling Cryogenics and Cryomech Liquid Nitrogen plants are based on two different technologies and each system having it’s own set of benefits. Cryomech offers several systems for lower production rates and Stirling product range goes to very high daily production rates. Experienced sales team members of MVS Engineering will guide you with selecting the right product based on your needs.

Who does the engineering of the integrated system?

MVS Engineering – India’s largest gaseous Nitrogen solution provider, equipped with a team of more than 150 personnel provides complete plant engineering including developing detailed data sheets, general arrangement drawings and also detailed drawings of the gaseous nitrogen system. All product data and drawings pertaining to the liquid nitrogen system comes from the OEM – Stirling Cryogenics or Cryomech. However, for customers in India, MVS Engineering is the single point of contact and we provide complete sales and support for the systems we offer.

What is the agreement between MVS and the Liquid Nitrogen plant manufacturers?

MVS Engineering has entered into an understanding with the OEMs of liquid nitrogen plants to represent their products in India and also act as an engineering partner. Due to MVS ability to provide systems in India, MVS plays a very crucial role as an engineering partner towards the total supply of the system.

Which parts of the system are indigenously manufactured?

Liquid nitrogen plant consists of two main subsystems. The gaseous nitrogen production and then the cryocoolers for converting gas into liquid nitrogen. The nitrogen gas production system including air compressor, cooling system such as chiller, electrical distribution panel and control system are manufactured by MVS Engineering in India. The cryocooler is manufactured by the OEM, Storage Vessel and PLC imported by MVS and integrated into a single system for plug and play operation.

APPLICATIONS

	Animal Husbandry
	Bull semen, or other animals, after extraction needs to be preserved and requires cryo temperatures. Hence, these require a steady supply of liquid nitrogen to avoid having years of research get wasted.

	Biostorage
	Many samples of biological nature such as blood, ovum, semen, seeds, viruses etc. require storage and preservation which takes place at cryogenic temperatures created by our liquid nitrogen plants.

	Aerospace
	For testing components at extreme climatic conditions, space research requires cryogenic temperatures, which can be achieved with our liquid nitrogen plants.

	Healthcare
	Cooling of various instruments such as MRI magnets and research institutes require extremely low temperatures for which liquid nitrogen supply is necessary.

	University and Research
	Many universities conducting research require a reliable source of liquid nitrogen for various departments. A single large system from us can produce sufficient capacity for an entire university or institute.

	NMR and MRI
	Super magnets require cryogenic temperature for operation and liquid nitrogen is commonly used for the same.

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Liquid Nitrogen

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Liquid Nitrogen Generators

Stirling Cryogenics

Cryomech

Stirling Cryogenics

Stirling Cryogenics – 70 to 3600 Liters/Day

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Specifications and advantages

HOW IT WORKS

How Liquid Nitrogen Generator Works

Technology History

Your own reliable cold source

Extreme cold anywhere, anytime

Stirling Efficiency

MODELS

MODELS

Cryomech – 10 to 240 Liters/Day

Cryomech – 10 to 240 Liters/Day

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Robust Features

HOW IT WORKS

HOW IT WORKS

History

History

MODELS

MODELS

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* These are typical specs and can be customised to match customer specific requirements

FAQ’S

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APPLICATIONS

Animal Husbandry

Biostorage

Aerospace

Healthcare

University and Research

NMR and MRI

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