May 2008 p11 p14 The goal of the cooling tower and chiller subsystem is to reject the heat from the chillers at the highest system efficiency possible. The old assumption that the workload of the largest motors should be minimized misses an important reality. The reality is that not all mechanical devices have the same energy efficiency nor do they react the same to changing conditions. The operating conditions that affect the system efficiency most include tower selection, chiller type and efficiency, chiller load, and ambient wet bulb temperature. In the past, various strategies have been suggested to meet the goal of best system efficiency. Some of these include: • Operate the cooling tower at the original design leaving-water temperature (such as 32°C). Chiller service technicians typically promote this strategy in an attempt to avoid chiller operation problems. • Operate the cooling tower at the lowest leaving-water temperature possible, (for example, always run the fans at full speed.) Supporters believe that reduced chiller energy use will minimize the energy used by the entire system. • Operate the cooling tower at a leaving-water temperature equal to the present outside air temperature wet-bulb plus the tower’s design approach temperature. Some of the major controls companies have promoted this as an optimum control strategy. • Operate the cooling tower at a leaving-water temperature that maintains a fixed pressure differential between the chiller evaporator and condenser. The chiller's energy use or the tower's energy use is minimized based on the selected pressure. The system's energy use is generally not affected. p16 Why Optimize Chiller with Cooling Tower System? 為何以水塔系統來優化製冷機組?
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Transcript
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The goal of the cooling tower and chiller subsystem is to reject the heat from the chillers at the highest system efficiency possible. The old assumption that the workload of the largest motors should be minimized misses an important reality. The reality is that not all mechanical devices have the same energy efficiency nor do they react the same to changing conditions. The operating conditions that affect the system efficiency most include tower selection, chiller type and efficiency, chiller load, and ambient wet bulb temperature. In the past, various strategies have been suggested to meet the goal of best system efficiency. Some of these include:
• Operate the cooling tower at the original design leaving-water temperature (such as 32°C). Chiller service technicians typically promote this strategy in an attempt to avoid chiller operation problems.
• Operate the cooling tower at the lowest leaving-water temperature possible, (for example, always run the fans at full speed.) Supporters believe that reduced chiller energy use will minimize the energy used by the entire system.
• Operate the cooling tower at a leaving-water temperature equal to the present outside air temperature wet-bulb plus the tower’s design approach temperature. Some of the major controls companies have promoted this as an optimum control strategy.
• Operate the cooling tower at a leaving-water temperature that maintains a fixed pressure differential between the chiller evaporator and condenser. The chiller's energy use or the tower's energy use is minimized based on the selected pressure. The system's energy use is generally not affected.
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Why Optimize Chiller with Cooling Tower System?為何以水塔系統來優化製冷機組?
Under a few operating conditions, each of these strategies will control the tower at the optimum setpoint for best system efficiency. For the majority of operating conditions, these strategies will be far from optimal.
Consider System Design Optimization before Chiller-Tower OptimizationFrequently when optimizing system design, attention initially focuses on the leaving-water temperature produced by the cooling tower. In reality, this aspect should be the final consideration because it often has the least impact on optimal and reliable system operation. To create an energy-efficient cooling tower system, follow these priorities listed in decreasing impact on energy usage:
• System design – Component selection and application• Sequence of operation – What to run when?• Setpoint determination – How hard do I run it?
System DesignThere are numerous variables that come into play in the design of condenser water systems. The following list contains examples of often-overlooked opportunities for system energy improvements:
• Use a cooling tower range (∆Ts) larger than the old rule of thumb, 5°C, which often results in a lower system first cost, lower system full and part load energy use and therefore lower life cycle cost. Many designers find that selecting tower and chiller ∆Ts in the 6.7° to 8.3°C range results in the optimum life cycle cost. Towers close to the chillers use 6.7 degrees ∆T, while towers farther away use greater ∆Ts.
• Choose cooling tower configurations that run multiple fans at low speeds rather than a single fan at high speed, which can result in significant operating energy savings.
• Always apply two-speed or variable frequency drive (VFD) drive technology to cooling tower fans. The energy savings justify it in almost every case. It also dramatically improves controllability and improves reliability maintenance.
Sequence of OperationEnergy-efficient control begins with a well-thought out and detailed system sequence of operation. The development of the system sequence should never be left up to the discretion of the controls contractor’s installation
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technician. Some control sequence strategies that can be applied to optimize cooling tower system efficiency include:
• Sequence fans on at low speed on active cells as required to control the desired leaving-water temperature before switching any fan to high speed, when operating multiple-tower cells on towers equipped with two-speed fan motors.
• Sequence fans on at low speed and ramp to approximately 50 percent to 60 percent before sequencing on an additional fan, when operating multiple-tower cells. Modulate all operating fans in parallel — at the same speed — to maintain the desired cooling tower leaving-water temperature.
• Enable multiple-tower cells and run more fans at lower speeds to save fan energy. Note that many cooling towers have a relatively narrow range of water-flow rates that they can effectively operate within, confirm with the tower manufacturer that enabling additional cells will not compromise this range. If it does, ask about the availability of wide-flow range nozzles or hot deck weirs that can be added to extend the tower flow range.
• Sequence off all tower fans before modulating the flow across the tower or chiller condenser for the purpose of maintaining the chiller minimum allowable condenser/ evaporator pressure differential. On rare occasions with single-speed fan operation, condenser water flow modulation through chillers may be required to coincide with fan operation to limit the number of fan start/stop cycles. In these cases, the application of VFD fan control should be considered to provide more stable operation and to minimize fan maintenance. Modulate the cooling-tower or chiller-condenser water flow only when necessary to prevent a chiller from operating below its minimum allowable condenser and evaporator pressure differential. If the water flow through the tower and or chiller is modulated, it may greatly reduce the tower or chiller efficiency.
Setpoint determinationAfter system design and sequence of operation has been analyzed for the best system efficiency, consideration can now be given to the determination of the cooling-tower leaving-water temperature that will allow for the lowest possible subsystem energy use (tower and chiller).
Related article is available as “Take it to the limit – or just halfway? “ ASHRAE Journal, July 1998, Volume 40, N0.7, pp. 32- 39“Tower water temperature – control it how??!” (http://www.trane.com/commercial/library/vol241/v24a.asp) Engineers Newsletter, Volume 24, No.1 The Trane Company, 1995, Schwedler, M P.E. and Bradley, B.
In actuality, there is no single, optimum cooling-tower leaving-water setpoint. It is a dynamic value that varies through time depending upon:
• Chiller type and efficiency• Tower type and efficiency• System load• Ambient wet bulb temperature
The optimum setpoint minimizes both chiller and tower subsystem energy use. Load, ambient conditions and the part load operating characteristic of chiller and cooling tower ultimately determine the optimum tower control temperatures for a given installation. Note, too, that screw chiller energy consumption increases quickly with reduced head pressure (condensing water temperature), so the optimal tower water setpoint control for these compressors may be lower than for centrifugal compressors.
The Trane Company patented a methodology which calculates a near optimal temperature as a function of the chiller work efficiency, cooling tower efficiency and the transfer rate and then operate the cooling tower to provide a conditioned fluid at the near optimal temperature. The calculation routine and control logic are implemented in Trane‘s control software (Tracer Summit) and are program as custom programming language (CPL) for implementing into project quickly.
Trane energy analysis tools analyze Chiller and cooling tower optimization for different weather location, building types and system components in quantitative manner. Trane sales engineer can assist you to analyze chiller and tower optimization upon your request.
This article is written by Mr. Peter Lau, Senior Manager of System Applications, Trane Asia Pacific.
有關文章:“Take it to the limit – or just halfway? “ ASHRAE Journal, July 1998, Volume 40, N0.7, pp. 32- 39“Tower water temperature – control it how??!” (hhtp:www.trane.com/commercial/library/vol241/v24a.asp) Engineers Newsletter, Volume 24, No.1 The Trane Company, 1995, Schwedler, M P.E. and Bradley, B.
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Problem Diagnosis for Chillers機組故障分析Trane chillers are installed with CH530 control panel, which can store up to 60 records of functional problems. When there is a problem during the operation of chiller, control panel will flash its red light to alert maintenance personnel for inspection. Maintenance personnel must investigate the information of control panel to confirm the problem and perform the maintenance work.
The factory also points out that if the chiller stops because of a functional problem, customer should not use the reset function casually to re-start the chiller. Contrari ly, the cause of the malfunction must be identified and resolved, then the chiller can be re-started. Otherwise, there could be serious damage to the chiller.
According to past experience, customer can follow these initial inspection procedures when encountering a similar problem. If there is evaporator water flow loss, the function of flow switch should be inspected first. If the problem occurs when the chiller is stopped, the chilled water pump should be checked to see if the time delay switch is properly installed and set. Usually there should be at least 3 minutes for the time delay in stopping the pump.
When RTHD ch i l l e r i s i n opera t ion , i f bu i ld ing management system instructs the chil ler to stop, the chiller will not stop immediately as it will wait for auto load to complete first, and time delay for unload takes about 40 seconds. Therefore, when building management system instructs to stop, the chilled water pump will not stop immediately and must wait until the time delay in stopping the pump is completed.
The newly launched CH530 control panel has an added function: when there is a chiller problem and the control panel is not reset, the control panel can record the important operating conditions, such as temperature, refrigerant pressure, electric pressure and electric current, 2 hours before the problem occurs, so that the maintenance personnel can investigate the cause.
In the Policy Address recently released, I am pleased to learn about the Government’s initiative in joining the global effort to combat Global Warming, particularly “conducting a Carbon Audit and implement an emissions reduction campaign in the new Central Government Complex at Tamar” (para. #39).
For this new Government Complex (Tamar project), we could have the opportunity to save as much as 1,000 tons of carbon emission every year* or a life-cycle emission reduction of 30,000 tons!
The Tamar project has total chiller (for air-conditioning) capacity of 10,000 refrigeration tons (RT) but unfortunately, it is currently specified to use refrigerants with zero ozone depletion potential (ODP).= For such large chiller applications, water-cooled centrifugal type is the most energy efficient choice; and there are 2 commonly used refrigerants, namely R-123 and R-134a. Since chiller design has to be optimized based on the choice of refrigerant and other associated technology, R-123 chiller has 15.6% better overall efficiency.1 And the actual energy savings will be much greater if it can be matched up with other equipment and controls to optimize the energy efficiency of the air-conditioning system as a whole. Putting zero ODP in the specification ruled out the choice of R-123 which is a HCFC though its ODP is as
Philip C.H. Yu, PhD RPE CEng Director of Environmental & Applications Engineering, Trane Asia PacificPhilip has over 15 years of professional experience in the HVAC field in Asia Pacific. He is actively involved in non-business technical activities both in Hong Kong and Mainland China. His areas of interest include building energy, chiller technology, refrigerant piping design and applications of various air-conditioning systems.
low as 0.012. This not only gives up significant indirect emission (i.e. energy related carbon emission) reduction mentioned above but also contributes direct emission to global warming because R-134a is a HFC greenhouse gas with global warming potential (GWP) 17 times higher and operates in centrifugal chiller at higher pressure with 4 times higherb emission rate. Apparently, R-123 is a better choice than R-134a from an integrated environmental assessment standpoint. There are numbers of supporting scientific evidence discussed in the past issue.2 As such, the environmental value of R-123 are more recognized and given favourable credit points in the latest version of green building rating standards of many countries including USA3, Australia4, Singapore5, and even Hong Kong6. Indeed most of them used to offer credit points to zero ODP as an environmental response to the Ozone Layer Protection in the past, now consider Climate Change as well in their latest version or take an integrated approach like LEED that incorporates also the important concept of life-cycle impact, total refrigerant charge and leakage rate.
Last September in Montreal, Canada, I had the privilege of taking part in the United Nation’s meeting of parties to the Montreal Protocol. One of the important results is “phasing-out first those HCFCs with higher ozone-depleting potential”.7 For instance, the U.S. government phased out HCFC-141b (ODP=0.11) in 2003 to meet the
Building Energy Code…
hot and fresh! 建築能源守則.... 最新修定
* Estimate based on simple equivalent full load hours for office building. = SS P318-Tamar, Section BS2 – Special Design Requirements.b According to LEED-NC version 2.2 green building rating system of the U.S. Green Building Council, the annual lead rate of R-134a chillers is 2% and that of Trane R-123
chillers is only 0.5%.
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Montreal Protocol requirement of first 35% reduction and HCFC-22 (ODP=0.055) is being phased out by 2010, which will be sufficient to meet the new “accelerated” schedule (see lower red line in Fig. 1), without impacting HCFC-123 and other low ODP substances till the end of phase schedule.
In view of a big cut in the new schedule of Montreal Protocol for developing countries (see the grey area
1 Calm, J.M. 2007. “Centrifugal chiller efficiency – benefits beyond reduced operating costs”, Act on Climate Change – Now or Never – Proceedings of the International Conference on Climate Change (ICCC, Hong Kong, 29-31 May 2007), paper ICCC-080.
2 Yu, P.C.H. "Re-thinking of HFC-134a", Trane Hong Kong newsletter, October 2006, pp. 6-8.3 USGBC. 2006. LEED for New Construction, version 2.2. U.S. Green Building Council, Washington D.C., USA.4 GBCA. 2007. Green Star environmental rating system for buildings, version 3.0. Green Building Council of Australia, Melbourne, Australia.5 Building and Construction Authority, Singapore. 2008. Green Mark for Air-conditioned Buildings, version 3.0.6 HK-BEAM Society. 2004. Hong Kong Building Environmental Assessment Method for New Buildings, version 4/04.7 UNEP. 2007. “Decision XIX/F: Adjustments to the Montreal Protocol with regard to Annex C, Group I, substances (hydrochlorofluorocarbons)” Decisions Adopted
by the Nineteenth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer. http://ozone.unep.org/
in fig. 2), the new Headquarters building of the central government environmental authority in the Mainland is using Trane R-123 chiller because of its superior energy efficiency and ultra low refrigerant leakage due to low pressure operation. I really don’t understand why our government still insist of using the old criteria “zero ODP” and give up the opportunity of 30,000 tons emission reduction!
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HCFC Production Cap
HCFC生產限額US EPA Est. of HCFC use
美國環保局估計HCFC用量
Actual HCFC usage
實際HCFC使用量Actual R-123 usage
實際R-123使用量
2007 MP Change
2007年的條約變更
Fig.1: ODP Weighted U.S. HCFC Use and Montreal Protocol (MP)
HCFC Consumption Cap for Article 2 (Developed) Countries
圖一:ODP加權HCFC在美國的使用情況及蒙特利爾條約對第二條款(發達)國家之HCFC消費限額
10% - 20150.5% - 2020
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1 Calm, J.M. 2007. “Centrifugal chiller efficiency – benefits beyond reduced operating costs”, Act on Climate Change – Now or Never – Proceedings of the International Conference on Climate Change (ICCC, Hong Kong, 29-31 May 2007), paper ICCC-080.
2 Yu, P.C.H. "Re-thinking of HFC-134a", Trane Hong Kong newsletter, October 2006, pp. 6-8.3 USGBC. 2006. LEED for New Construction, version 2.2. U.S. Green Building Council, Washington D.C., USA.4 GBCA. 2007. Green Star environmental rating system for buildings, version 3.0. Green Building Council of Australia, Melbourne, Australia.5 Building and Construction Authority, Singapore. 2008. Green Mark for Air-conditioned Buildings, version 3.0.6 HK-BEAM Society. 2004. Hong Kong Building Environmental Assessment Method for New Buildings, version 4/04.7 UNEP. 2007. “Decision XIX/F: Adjustments to the Montreal Protocol with regard to Annex C, Group I, substances (hydrochlorofluorocarbons)” Decisions Adopted
by the Nineteenth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer. http://ozone.unep.org/
* Estimate based on simple equivalent full load hours for office building. = SS P318-Tamar, Section BS2 – Special Design Requirements.b According to LEED-NC version 2.2 green building rating system of the U.S. Green Building Council, the annual lead rate of R-134a chillers is 2% and that of Trane R-123
chillers is only 0.5%.
Fig.2: Montreal Protocol (MP)
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countries
圖二:蒙特利爾條約對第五條款(發展中)國家之HCFC消費限額
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Phase out of HCFC
use in new equipment (was 2040)
分階段停用HCFC於新器材(原本於2040年)
90%-2015
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2.5% - Service Tail
維修使用
2005 2010 2015 2020 2025 2030 2035 2040
2007 MP Change2007年的條約變更
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To meet the market demand, Trane has specially launched the RTWD series of water cooled screw chiller manufactured in China, with cooling capacity from 70 to 250 tons using R134a refrigerant. The chiller uses compressor and starter panel directly imported from the U.S., therefore is more reliable and has a wider range of operating temperatures. Equipped with the newly improved CH530 control panel, it is one of the best choices in the market.
AerisGuard Maintenance Corrosion Protection (AerisCoat) provides comprehensive protection for coils of heat exchanger against corrosion or oxidation. Through extensive long term field testing, AerisCoat has proven to offer up to 5 years protection for onsite application.
AerisCoat is newly represented by Hong Kong Air-conditioning Parts Centre and now available with stock on hand.
Carrefour’s First Two Energy Efficiency Stores in China
家樂福首兩家節能商店於中國開業
Mega department chain store Carrefour has opened two new stores in Wuhan and Beijing respectively in January. Trane provided all the air-conditioning systems for these two energy efficiency stores and was invited to attend the opening ceremony. Also, Trane organized a promotional activity entitled “Energy Saving in My Home” at Carrefour, showing the highly energy-efficient EarthWiseTM system used by these two stores and the advanced integrated control system. Senior management from Carrefour, Consulate from the French embassy, representatives from World Wild Fund and related government officials were present. The air-conditioning system also includes a remote controlled energy management system specially designed for Carrefour. Through this system, the central monitoring and operating centre of Carrefour in Shanghai can control the operation of air-conditioning systems at all its outlets. Trane is proud to be appointed by Carrefour as the official supplier in air-conditioning and management systems for all its new stores in China, and to provide energy saving improvement services for its existing stores.
Trane Taiwan just won the Outstanding Facility Supplier Award by United Microelectronics Corporation (UMC) recently for its quality products and technical support. After using the facilities provided by Trane, UMC saved an impressive US$2.5 million in operating cost between the second half of 2006 and 2007. UMC is the first listed semi-conductor company in Taiwan, and has 12,000 employees all over the world.
Trane Taiwan Won Outstanding Facility Supplier Award特靈台灣獲頒傑出供應商獎
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Prevention of Legionnaires’ Disease Committee預防退伍軍人症委員會Mr. K. L. Chan, Operations Director, is renewed by Development Bureau as a member of the Prevention of Legionnaires’ Disease Committee. The three-year tenure started from November 2007.
The new high-tech manufacturing facility near Bangkok, Thailand by Trane and Jardines was officially open on 12 March. The management f r o m T r a n e a n d J a r d i n e E n g i n e e r i n g , government officials of Thailand, customers, dealers and suppliers were present at the opening ceremony. The new facility mainly produces household and commercial air conditioning units to meet the huge demand from markets in Asia Pacific, Latin America, Europe and Middle East. The plant has a product development laboratory and state-of-the-art inspection facilities. Also, it has a training centre to provide a technical exchange and experience sharing platform for customers, dealers and business partners.
Trane and Jardine executives at the new factory.特靈及怡和機器的管理層攝於新廠房。
Annual Dinner 週年春茗Trane held the annual dinner in early February at the City Hall. Over 200 staff put their work aside and participated this fun-filled occasion. They enjoyed a sumptuous dinner and had a great time together. Our infamous "Sister Chu" received the grand prize from Mr. K. K. Leung, Director and General Manager, with a big, cheerful smile.
Builtech Asia 2008亞洲建築科技2008Mr. Peter Lau, Senior Manager of System Applications, Trane Asia Pacific, was invited as a guest speaker at Builtech Asia 2008 seminar with the topic of ”I n t e g r a t i n g H V A C i n t o B u i l d i n g Systems”. The seminar was aimed at providing the latest technical knowledge on bui ld ings, audience was mainly from project consultancy companies, developers, government departments and contractors.
Re-structure of Sales Departments重組銷售部門To be in-line with the current business environment and explore new opportunities, Trane Hong Kong started restructuring the Sales Departments in January this year. Newly created departments include Strategic Account Department, which is responsible for unitary products for new buildings in Hong Kong and overseas joint projects in Macau, China and other countries, while the Energy Solution Department mainly provides system update and energy solutions for customers. Existing Buildings Market Department, New Buildings Market Department and Trane Controls Department will continue their sales services as before.
Old Faces昔日面孔Mr. K. K. Leung, Director, and Mr. K. L. Chan, Operations Director, had a warm reunion with Mr. Hans Rueschmann (third left), former Vice President of Unitary Product, Trane Asia Pacific, and Mr. Tony Chow (fourth left), former Director & General Manager of Jardine Trane Airconditioning recently. Mr. Hans has retired for years and is very active in voluntary church services, while Mr. Chow is enjoying his retirement life in Shanghai now.
董事梁基強先生及業務董事陳家龍先生於2月下旬,與前特靈亞太區單元式產品副總裁Mr. Hans Rueschmann(左三)及前怡和特靈董事兼總經理周榮光先生(左四)相聚一番,閒話當年。Mr. Hans退休多年,近年為教會擔任義務工作。而周先生近年長居上海,享受其寫意的退休生活。
To enhance staff’s service and team spirit, we have arranged a Service First Workshop on 5 and 6 of March at the Gold Coast Hotel, Tuen Mun. Through different interesting games and vivid presentations, everyone has commanded a good knowledge of the importance of service first and team spirit.
HKIE Fellow Member香港工程師學會資深會員Mr. Frankie Chan, Operations Director, was appointed by HK Institute of Engineers as Fellow Member in January this year. Mr. Chan has over 20 years of experience in the field of engineering and construction, and holds a bachelor and a master’s degree in mechanical engineering from Hong Kong University, as well as many other professional q u a l i f i c a t i o n s , i n c l u d i n g Registered Professional Engineer, Chartered Engineer (UK & Australia) and Certified Energy Manager. Mr. Chan is now the Honorary Secretary of the Building Services Division of HKIE and a Director of HAESCO. He is also appointed by the HKSAR as a member of the Contractors Registration Committee Panel and the Contractors Registration Committee, as well as a Sector / Subject Specialist for the Hong Kong Council for Academic Accreditation.
Dealer Meeting 20082008年經銷商晚會Trane Dealer Meeting 2008 was held on 10 March 2008 at City Garden Hotel, North Point. Dealer excellence awards were also presented to praise their outstanding sales performance in 2006 and 2007 by Mr. K. K. Leung, Director and Mr. K. L. Chan, Operations Director. An exciting series of upcoming dealer activities were unveiled that night, which included the factory visit to Zhongshan plant, product presentation and technical training.
There are 12 dealers received outstanding sales awards for their dedication and support to Trane for the past two years, they include:
MTR Corporation plans to upgrade the air conditioning system of its stations gradually. Eleven water cooled and air cooled chillers with a total of 3,025 tons will be replaced and installed in 4 of the stations and the Kowloon Bay depot. The project is expected to take 2 years and be completed by July 2009.
United Centre 統一中心Trane is working on an electric mechanical improvement project for the 27-year old United Centre in Admiralty. The project includes changing the air handling units, repairing chillers and changing the sprinkler system for the entire building. The project will be completed by end of June.
Kornhill Apartments康蘭居Kornhill Apartments in Island East is a service apartment with 450 rooms. Trane is installing a water cooled centrifugal chiller with 800 tons there. The project is estimated to finish by mid 2008.
Many colleagues have dedicated their services to Trane for 10, 15 and 20 years, and the management presented a special award to each one of them as an appreciation for their contribution over the years.
Mr. and Mrs. Matthew Yu tied their knot on 28 December 2007. Our warmest wishes for their love to last forever!
恭喜余堅成夫婦於2007年12月28日新婚之喜。
New Kid | 喜獲麟兒
Congratulations to Mr. Zeno Wong for his newborn baby boy!
恭喜王仕明先生最近喜獲麟兒。
From left: Mr. K. M. Lun (Manager), Mr. Tom Cheung (Assistant Manager) and Mr. C. W. Chau (Senior Engineer)
左起:倫健文先生(經理)、張景威先生(助理經理)及周頌威先生(高級工程師)
Staff Promotions | 員工晉升
Congratulations to the following staff on their promotions! Wish them more success in their new appointments.
恭喜以下同事獲擢升,在此祝他們平步青雲。
Mr. James Graham (left), Chief Executive of Jardine Engineering Corporation, presented the 20 Years Service Award to Mr. K. L. Chan (right), Operations Director of Trane Hong Kong in JEC Spring Dinner.怡和機器有限公司行政總裁關正仕先生(左)於怡和機器春茗晚宴上,頒發二十年服務獎予特靈香港業務董事陳家龍先生(右)。