I I I I

No u veiles de I'industrie Saginomiya digital thermostats

A new series of digital thermostats from Saginomiya has been announced by Cryo Limited.

Based on the successful 1LE, the new models, the DLE series, feature LED temperature indication and 10 A SPDT contacts.

Five temperature ranges are available: - 4 0 to +20~C, 0 to +60~C, 0 to +100°C, 50 to 150~'C and 140 to 240"C.

The digital display has a 1 C resolution and incorporates a unique feature. Should the temperature rise out of range it displays HI and if it drops out of range LO.

The differential is fully adjustable and the temperature sensor can be located up to 100 m from the controller. The thermostat ~s designed for wall mounting.

Sagmomlya d~gJtal thermo.,,tats

To complement the DLE, a digital humidistat is now available. Designated the HLE, this will ha~e a control range from 30 to 90",, RH, again with an adjustable differentml.

Cryo Limited, Robert Fawkes House, Rea Street South, Bir- mingham B5 6LB, UK

Digital air condition monitor

An air condition monitor has been produced by Eaton-Will iams which is designed to supersede chart recorders. In addition to accurately monitoring temperature and relative humidity this compact digital instrument measures the rate of change for both.

Adjustable limits can be pro- grammed for both normal and relaxed conditions with any deviations triggering an audible and visual alarm. The integral micro- printer provides a continuous graphic record of the environmental condition for up to seven weeks.

The air condition monitor features an RS 232 interface data trans- mission port for remote alarm or for computerized control of the air conditioning system.

Eaton-Williams Products Limited, Four Elms Road, Edenbridge, Kent TN8 6AB, UK.

York win chiller contract

A contract to provide two air cooled water chillers for the new £9 million Glaxo research laboratory' at Hertfordshire, UK, has been won b> York International Limited.

The YCWA 532dm 3 units will provide an installed coohng capacity' of 2180kW to provide cooling to offices and laboratories 24 h a day, 365 days a year.

Both machines are controlled by a common eight-step leaving water temperature controller using a compressor per stage.

Four independent refrigerant circuits in each unit will serve the existing research complex together with the new £9 million building, now under construction, which will increase Glaxo's resources to develop ethical pharmaceutical products for human patients.

York International Limited, Unit 5, Piccadilly Trading Estate, Great Ancoats Street, Manchester MI 2NP, UK.

Solvent recovery by refrigeration

A system of solvent recover) utilizing refrigeration has been developed by APV Hall International Limited of Dartford, U K.

In principle, a tower embodies a series of coils progressively cooling a gas/air mixture. A regenerator at the top heats ,mtgoing air ~hflst pumping the cooled sohent to ,,,pray,, in the gas inlet provides useful , l'rce cooling

The arrangement of the cod,,, t.-, ,~uch that condensing solvent from the upper, iou. temperature coils falls onto the lower, high temperature coils, thereb,~ reducing the refri- geration duty.

A refrigeration plant recently installed by APV Hall International to recmer acetone at a phar- maceutical company will sho,a running costs of ~£16000 p.a. Comparat lxe costs for recovery by steam would be in the region 4f £ 160 000 p.a. As maintenance costs are commensurate, substantial savings are shown.

Usually the vast quantines ol solvent used m the chemical, pharmaceutical and food industries remain in llqmd form and arc recovered by separation. In instance.~ where solx ents are e~ aporated m the presence ,,f }llr OF other non- condensable gases recto cry ~s a verx much more complex and expens~xe process x~th other considerations of en\,lronnlental cont fol

Although efficient, the carbon adsorption method is vet3 expensive m terms of both capital and runmng costs, maultenallce and corrosion.

Recovm3 of solvents by refri- geration has additional advantage.,, as it IS more flexible contending with fluctuating loads, particularly overload conditions and distillation of the reco,~ered soh'ent is far simpler being a continuous process.

With regards to boiler plant, steam used for regeneration is completely lost as the condensate cannot be recovered. This means extra make-up

372 Int. J. Refrig. 1986 Vol 9 November

Industrial n e w s No uvelles de I'in dustrie

of boiler feed using treated water. For all processes ha~ing sub-

stantial solvent recovery' systems a refrigerahon plant ~s a cost-effective alternative to existing methods

APV Hall International Limited, PO Box 555, Hythe Street, Dartford, Kent DA1 IEP. [iK,

Sun glass

A new method of harnessing solar power to produce domestic hot water and heat braidings, even on cold dull days, is no~ being successfully marketed worldwide.

This sophisticated new solar heating system, designed by Thermomax of Northern Ireland uses specially designed glass tubes to convert &rect and indirect sunlight into heat for domestic or industrial use in widely varying climates. So efficmnt is the new system that it is making significant savings in both installation costs and fuel bills from Alaska to Australia.

The system was first developed four years ago but has been constantly' improved and adapted to suit widely ~,arying condtions. Now Thermomax's efforts are resulting in marketing success around the ~orld. Thermomax haze perfected their product to the extent that it can now heat water efficiently up to a temperature of 95 C even with a low outside temperature.

The Thermomax system uses solar collectors or tubes - -6f t in length and >- 2.5 in in diameter. Many of the problems associated with con- ventional solar panels: heat loss, corrosion and sensitivity to weather conditions, have been overcome. The new type of tube ~s a vacuum chamber which contains a full length heat absorber plate covered in a special black coating for high energy conversion. Attached to the plate is a heat pipe made of special steel which transfers heat to a manifold located above the tube. Up to 30 tubes can be fitted into the rectangular shaped

insulated manifold through which the water to be heated passes.

This system allows for control of the temperature of the fired in the heat pipe m each tube. The control mechanism, which limits the maxi- mum working temperature, can be customized to smt individual needs for either domestm or industrial use and is an added safety measure doing away with the need for a mechanical safety control which could fail. When in place the system resembles an array' of fluorescent light tubes which are then attached to a flat or sloping roof.

Two models are manufactured one is suitable for providing domestic hot water and space heating {domestic

users make up --- 90", of the market), while the other 1s designed for high temperature use, such a,s producing steam to run small turbines for irrigation or desalination. The applications of the system are wide ranging with additional uses such as providing energy to operate an air conditioning system.

The finished product is easy to handle and install and in the unlikely event of a tube being damaged replacement is relatively cheap and easy. Though the tubes may look fragile they can support the weight of an average sized man.

Thermomax, Ballo Crescent, Bangor, County' Down BP19 2UP, UK.

Cooling tower range

Detailed design changes have been incorporated by Heenan Marley Cooling Towers Limited in their Series 4400 Mk II Aquatowers. These changes include direct drive glass reinforced plastic bladed fans.

Four packaged units comprise the new Series 4400 Mk II range of energy efficient, cross-flow, water cooling towers whmh are the smallest units manufactured by Heenan

Series 44~) Mk II Aqualower

Marley. With water handling capacities

from 180 to 3750 gallon h - I and nominal refrigeration capacities of 4.5-15t, the Series 4400 M k l I towers can be matched to the water cooling requirements of plastic injection moulding machines, degreasmg and oil quenching appli- cations as well as food and other processing needs including those of air conditioning systems

All the prox en features of the Series 4400 have been retained in the Mk II range. These include a close-pack timber fill designed to give maximum air water con tac t , a graxity w a t e r

distrlbutron system, azr inlet and drift eliminators packaged within an all bolted construction, heavy galva- nized steel casing.

G R P fan venturis are fitted for maxnnum efficiency ~,ith the minimum of noise. Totally, enclosed fan venulated motors u~eather- proofed to I P55 requirements are

standard throughout the complete range of Heenan Marlev coohng lowers.

The Series 4400 Mk II is covered by a two-year warranty when installed in the UK.

Heenan Marley Cooling Towers Limited, PO Box 20, Pheasant Street, Worcester WRI 2DX, UK.

Rev. Int. Froud 1986 Vol 9 Novembre 373