products that perform…by people who care - dunham bush · dunham-bush is developing the new...

Products that perform…By people who care

ENGINEERING BULLETIN… FEB 2015 (Vol 1)

Dunham-Bush is developing the new series of energy efficient chiller using

the oil free magnetic bearing technology, the PROmetheus series. The

PROmetheus series is part of Dunham Bush successful R&D and

continuous effort to develop and manufacture product of high efficiency and

reliability. Some of the PROmetheus product series features are:-

Equipment : Magnetic Bearing Chiller

Model : PROmetheus (DCLC-M)

Description : New Product Development

State of-the-art compressor technology

High efficiency with superior IPLV

Easy maintenance

Super quiet with low vibration

HFC-134a refrigerant

Oil free with magnetic bearing

The prototype unit has been supplied to a project in Miami USA. The unit

has replaced an existing water cooled screw chiller as part of an upgrading

and energy efficiency exercise. It has been running successfully since Aug

2014 with superior energy efficiency, low noise with less maintenance. The

PROmetheus series is expected to be officially launch soon with capacity

ranges from 120-600RT.


Dunham-Bush is also developing the new energy efficient rooftop series

with inverter scroll technology.The new Falcon series is also part of

Dunham-Bush continuous effort to develop and manufacture product of high

efficiency and reliability. Some of the new Falcon product series features

are:-

Equipment : Inverter Rooftop Unit

Model : Falcon (ACPSE-P)

Description : New Product Development

Inverter scroll compressor technology

High efficiency with superior IPLV

Energy saving features

Super quiet with low vibration

HFC-410a refrigerant

Dunham-Bush engineering and R&D team is

developing the prototype unit to be display in

an exhibition in June 2015. The new Falcon

series will put Dunham-Bush ahead of the

competitors with product of energy saving, high

efficiency and reliability. The product is

expected to be officially launch by this year.


As part of Dunham-Bush continuous improvement, we have released the

new generation of SPEC selection software with new features and

enhancements. In this new generation, the SPEC selection software is split

into different versions, with each version assigned for dedicated product

line. This will improve the updates and enhancements of each product lines

as well as making it user friendly.

The list of SPEC selection software version is listed below:-

Equipment : Selection Software

Model : SPEC

Description : New Version of Selection Software

SPEC VERSION PRODUCT LINE STATUS

SPEC Water Cooled ChillerAir Cooled Chiller

Active

SPEC – CINDY Centrifugal Chiller Active

SPEC – ASHLEY AHU Active

SPEC – PHOEBE Packaged Next Release


Did you know that as a SPEC user you are able to download the latest

catalogue online from the Dunham-Bush website via the RepNet portal. All

you need is your SPEC username and password. The RepNet portal is not

only limited to catalogue but also other product literature such as IOM and

brochures. All you need is to follow the following steps to retrieve your latest

catalogue:-

Equipment : Product Catalogue

Model : RepNet

Description : Online Catalogue from Website

Step 1 – Click on RepNet tab on Dunham-Bush Website

Step 2 – Enter your SPEC username & password



Model : RepNet


Step 3 – Select your product category

Step 4 – Select your product model



Model : RepNet


Step 5 – Download your catalogue

Step 6 – Download complete

APPLICATION BULLETIN… FEB 2015 (Vol 1)

ModelMax. Allowable Piping

Length (L)Elevation Difference Between Two Units

ACCS 68-1520 75 ft [22.9m] 30 ft [9.2 m]

Continuous research and development (R&D) on Dunham-Bush air cooled

split unit has resulted in the improvement of the maximum allowable

equivalent length and elevation for the ACCS/EB Series for 50/60hz with

R22/R407C refrigerant, as indicated in the table 2 below.

This shall supersedes the table in page 13, IOM# MM0305F/MM0307A

with immediate effect. The new revised IOM may be downloaded through

the RepNet portal.

ModelMax. Allowable Piping

Length (L)Elevation Difference Between Two Units

ACCS 68-570 125 ft [38.1m] 65 ft [19.8 m]

ACCS 640-1520 100 ft [30.5m] 55 ft [16.8 m]

Table 1: Old Piping Length & Elevation

Table 2: New Piping Length & Elevation

Equipment : Air Cooled Split Unit

Model : ACCS / EB

Description : Refrigerant Piping Length & Elevation


Equipment : Air Handling Unit

Model : CS3

Description : Thermal Break Application

Thermal Break feature consists of casing construction with frames of

extruded aluminium profiles joined by nylon corner pieces, and sandwich

panel with PVC strip in between inner and outer layer. The unit

construction with no direct metal to-metal contact between paneling and

framework thus minimizing cabinet condensate.

Thermal break featured AHU prevents the unit

external condensation that causes AHU to 'sweat'

or condensate easily. One may ask with the

application of thermal break featured AHU, does it

mean that the AHU is no longer 'sweating‘ at all,

no matter whether it is located outdoor or indoor

with warm or even cold ambient air?

The answer is…

NO…! It does not mean that the AHU is no longer 'sweat’ or condensate

when thermal break construction is applied. It depends on some

parameters such as the ambient air temperature (T-amb) of the AHU room

and the AHU internal cold air temperature (T-in) after cooling coil.

Although thermal break construction can reduce the effect of

condensation as compare to conventional construction.

T-amb

T-in

T-in = Off coil temperature

T-amb = Outside AHU temperature



Model : CS3


Cabinet external condensation curves for the Conventional

Steel/Aluminium is shown on the Psychometric Chart below. 3 curves are

plotted to represent the internal cold temperatures, which is normally the

off-cooling coil temperature i.e. 490F, 550F and 600F.

Any ambient air condition (where AHU is located) above the curve,

condensation occurs on external cabinet. On the contrary, it the ambient air

condition below the curve, condensation will not form on the AHU external

cabinet.

Chart 1: Conventional Casing



Model : CS3


Thermal break casing are able to improve the cabinet external

condensation curves as shown on the Psychometric Chart below. These

will reduce the condensation effect on some applications. However, it may

not prevent condensation in some critical applications. Therefore, a study of

the parameters (T-in, T-amb) plotted on the Psychometric Chart shall be

take into consideration to ensure no condensation will occurs especially on

critical applications. Some of the examples of critical applications are:-

1) Ducted Return Air Application

2) High Percentage Fresh Air Application

Chart 2: Thermal Break Casing

DUNHAM-BUSH WORLWIDE…

SingaporeMalaysia

China

South Africa

Dubai

Indonesia

Vietnam

Thailand

United Kingdom

Malaysia

Lot 5755-6, Kidamai Industrial Park, Bukit Angkat 43000, Kajang Selangor Darul Ehsan

Tel: +603-89249000 Fax: +603-87395020

China

No 1 Dunham-Bush Rd Laishan District, Yantai, Shandong Province, China 264003

Tel: +86-535-6588999 Fax: +86-535-6581999

United Kingdom

No 8, Downley Road, Havant, Hampshire, England PO9 2JD

Tel: +44-2392477700 Fax: +44-2392450396

UAE

Office # 2606, Fortune Executive Towers, Cluster T1, Jumeirah Lake Tower Dubai,UAE

Tel: +971- 44439207 Fax: +971-44439208

South Africa

57, Sovereign Drive Route 21 Corporate Park Irene, Pretoria South Africa

Tel: +27-123454202 Fax: +27-123454203

Singapore

2 Kallang Pudding Road, #07-07, Mactech Building Singapore 349307

Tel: +65-68422012 Fax: +65-68422013

Indonesia

The Vida Building 7th Floor Jl. Raya PejuanganNo. 8 Kebon JerukJakarta 11530, Indonesia

Tel: +62-2129778100 Fax: +62-2129778001

Vietnam

10th Floor, Nam A Bank Tower, 201-203 Cach Mang Thang 8 Street, District 3, Ho Chi Minh City, Vietnam

Tel: +84-862903108 Fax: +84-862903109

Thailand

1, Qhouse Lumpini, 27th

Floor, south Sathorn Road, Tungmahamek, Sathorn, Bangkok, Thailand 10120

Tel: +66-026103749 Fax: +66-026103601

FEB 2015 (Vol 1)

products that perform…by people who care - dunham bush · dunham-bush is developing the new...

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