Salient Features of Voltas Vam

7/28/2019 Salient Features of Voltas Vam

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We are pleased to highlight various salient features on our VapourAbsorption Machines as follows :

1.0 PARAFLOW TECHNOLOGY :

We manufacture Vapour Absorption Machines under technical

collaborations from Hitachi Limited of Japan with their patentedParaflow Technology.

We wish to quote communication received on Technology matterfrom Hitachi in 1993 which is as follows :

Quote

In the past, Sanyo, Kawasaki, Ebara & Mitsubishi (some of theother major manufacturers of VAM in Japan) had to go with

Series Flow because of Hitachi Paraflow patent. RecentlyKawasaki & Ebara changed to go with Paraflow or Paraflow/SeriesFlow combination right after the expiry of the patent. Sanyo &Mitsubishi still have gone with Series Flow, but everymanufacturer realizes the superiority of the ParaflowTechnology.

Unquote.

In 1994, Mitsubishi also stopped manufacturing VAM withTechnology of series flow and are now manufacturing VAMs with

Paraflow technology.

Even in USA, YORK, who were manufacturing VAM with seriesflow technology discontinued and freshly entered intocollaboration with Hitachi in 1994 for manufacturing VAM withParaflow technology.

Apart from the above, even other manufacturers in South EastAsian Countries like Samsung and other major manufacturers ofVAM, follow Paraflow technology.

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SALIENT FEATURES OFVOLTAS-HITACHI

VAPOUR ABOSORPTION MACHINES


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You will note from the above, that Series Flow Technology is

reaching almost obsolesce, as most of the manufacturers have nowadopted Paraflow Technology.

ADVANTAGES OF PARAFLOW TECHNOLOGY :

For more understanding, the cycle diagram giving exclusivefeatures of Hitachi Paraflow technology is attached (Anexure-I).

The main advantages of Paraflow technology are :

The Paraflow machines consume 7% to 10% lower steamconsumption compare to series flow machines.

It works with low concentration and temperature cycle thereby

enhancing Efficiency & reliability of the machine, i.e.

It works away from the crystallization zone and hence has

very high level of reliability towards uninterrupted servicesand is almost free from crystallization.

Due to lower temperature, the fouling and corrosion in the

heat exchangers are low and hence the consistency inperformance is available for long duration of operations.

Due to lesser fouling, availability of consistent capacity and

temperature is possible.

Operating efficiency i.e. steam consumption rates remain

reasonably steady since the fouling in machines are low.

Machines will have much longer life compared to other

technology due to almost negligible or no corrosion due to

safe cycle of operation. Safeness in Paraflow cycle compared to series flow cycles is

represented in the typical duhring diagram enclosed.

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2.0 Apart from above, various additional salient features provided in

our VAM are enlisted below :

2.1 PATENTED SOFT SPRAY NOZZLES :

Hitachi has patented Soft Spray Nozzles design and the same areavailable only from Hitachi or from their Licensees. These arestainless steel nozzles provided with special spray arrangementfor spray of refrigerant, water and Lithium Bromide solution inevaporator and absorber sections respectively.

Due to soft spray arrangement, the entire heat transfer area isfully covered by very fine droplets discharged from soft spraynozzles. It offers consistent heat transfer exchange and therebymake the over all operations of the machine highly reliable andconsistent.

2.2 HIGH PERFORMANCE FIN TUBES :

In the evaporator section and also as per the design requirementin absorber section, the high performance fin tubes are provided.

These tubes offer excellent heat transfer efficiency compared toplain tubes provided by others. The approach available due tothe high performance fin tubes is very low and thereby themachine capability is improved to a very large extent. Also thismakes the machine work very satisfactorily even with lowtemperature operations like 5C chilled water outlet conditions.This helps in maintaining consistent chilled water temperatureavailable for the load.

2.3 STAINLESS STEEL IMPELLER FOR PUMPS :

The refrigerant and solution pumps are canned motor pumpsprovided with stainless steel impellers for longer life and reliableoperation. Others provide cheaper grade of cast iron impellers.

2.4 FUSED SIGHT GLASSES :

Since the VAM requires very high degree of vacuum integrity. Itis absolutely essential to provide Sight Glasses without anyrubber rings. The fused Sight Glasses do not have any rubberrings in it. In this, the glass is fused into the metal and ensures

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100% leak tight joint and ensure no leakage from this port for life

long and is virtually maintenance free.

Others provide bolted sight glasses with rubber rings which overa period of time deteriorates and allows fine air leaks into themachine. This results in corrosion of the machine and reducesthe performance and life of VAM unit.

2.5 LOW GENERATOR PRESSURES :

The Paraflow design allows high temperature generator pressure

which is well below atmospheric pressure i.e. in the range ofabout 500 to 600 mm of HG, whereas in case of Series Flow, it isessential to operate the HTG at higher pressures due to systemrequirements i.e. in the range of about 700 mm of HG or more.This high-pressure operation results in nuisance tripping of themachine and reduced availability of machine for continuous load.

2.6 NON-TOXIC INHIBITORS :

We use non-toxic type inhibitors i.e. Lithium Nitrite and Lithium

Molibdate. Sometimes others use Lithium Chromate, which ishighly toxic and carcinogenic.

2.7 FACTORY PERFORMANCE TEST :

We have full-fledged performance testing facilities in our factorywith advanced instrumentation and controls. As per ISO 9001,the performance test of the VAM in the factory is a mandatoryrequirement of our quality assurance plan. Each and everymachine is performance tested prior to despatch, which is

witnessed by the customer/consultant. The test bench in ourfactory provides necessary facilities to simulate the conditionsand provide artificial heat load for operating the machine on thestipulated chilled water, cooling water conditions and check themachine for its capacity and steam consumption. The VAMs aredespatched once the performance test is satisfactorily conductedand witnessed by clients/consultants.

2.8 QUALITY ASSURANCE :

Much emphasis is given on the Quality Assurance while buildingup this machine at every stage. Each and every component goes

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under thorough inspection in line with Hitachis Inspection

Procedures and guidelines. The necessary process controls areused at all the critical points which manufacturing the machinesto ensure that the machine is produced with a philosophy of FirstTime Right.

2.9 CONTROLS & SAFETIES :

All the vacuum side controls, switches, instrumentation areimported from Hitachi and we do not use Indian Pressureswitches. This ensures high level of operating reliability for the

machine.

2.10 ADVANCED MICROPROCESSOR BASED CONTROLS :

As a standard, we provide microprocessor based control panelswith user friendly man machine interface. The key boards areprovided with functional names, which give operators a very highlevel of user friendliness. In addition to this, a complete LEDfascia is provided on the front door of the panel, which gives at aglance the health of the machine.

The unit has provisions for communication for customerrequirements for PC connectivity, BAS, BMS and DCS, ifrequired can be provided.

2.12 VOLTAS AIR-CONDITIONING & REFRIGERATIONEXPERIENCE:

Voltas has been in the field of Air-conditioning & Refrigeration formore than four decades and can offer single point responsibilityfor the machines as well as the air-conditioning works as an overall guarantee which is mostly the ultimate requirement of thecustomer.

For VOLTAS LIMITED,

SUNIL MEHTA

Asst. General Manager

Sales Headquarters EM & RBG.

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Salient Features of Voltas Vam

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