How the Bitzer IQ Module works in refrigeration systems with Bitzer reciprocating compressors
Afcon addresses where the industry in going in terms of gas use?
Afcon Supplier Profile
Afcon profiles Carel's Stuart Williams
Over the last 20 years Stuart has cultivated his knowledge at Cool Power, Barlows, Samsung, SANBS, and now at Carel. Currently Stuart’s focus is on expanding Carel’s brand name and sales in the KZN and Eastern Region.
Much like our last Customer Profile feature, Craig Scott, (click to view this article), Stuart enjoys the challenges that the industry and his job offers, namely providing high efficiency controls for each unique customer's need and project, at a competitive rate. Once this has been achieved Stuart enjoys site visits, where he can view the controls in action, and ultimately the successful job.
Carel Control’s products have been successfully used across many industries, including pharmaceutical, diary and retail. Over the last three years Stuart has been involved in many successful projects. One of these being the new Dairy Day dairy in Howick, as well as another with Cipla. Stuart was also involved in the installation of Carel’s first HEOS, water loop refrigeration system, in Durban.
Stuart’s impact at Carel can be seen by the considerable increase in Carel sales that have been achieved over the last three years, with Afcon being one of the its most successful wholesalers.
The main applications of Onda brazed plate heat exchangers is for the evaporation and condensation of refrigerant gas in air-conditioning and refrigeration plants, the hot water production in heat pumps and heat recovery. Onda's brazed plate heat exchangers are compatible with all modern refrigerants.
Only top quality materials are used in the manufacture the ONDA brazed plate heat exchangers. The Plate heat exchangers are made from Stainless steel thickness 0.0138” (316L type), the connections are also Stainless steel (304L type) and the brazing material is copper.
Afcon is the sole importer of Onda Brazed Plate Heat Exchangers in South Africa. Call us now for more information or browse our website http://www.afcon.co.za/onda
Afcon's stand at the SAIRAC GOLF Day
The SAIRAC Golf Day held on Friday 8th September, was the usual success and very well supported by the industry, with a record field of 38 four balls. Thank you to Tarryn Ching for her exceptional organisation. As always it is fantastic to meet our fellow HVAC&R colleagues in a relaxed atmosphere.
For the third year running Afcon sponsored the 11th hole. We thank all of you who visited our hole, and are certain the banter and cheer experienced cannot have been rivalled by any other. It was a glorious day out on the course in sunny Durban. Our congratulations to the winners of the day and to the Airconditioning Project's four ball who won the SAIRAC trophy.
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Afcon Customer Profile - Craig Scott
This week we sat down with Craig Scott, of CS Air, to chat about where he started, where he is now, and everything in between.
Craig has been in the HVAC industry for 25 years, and first entered it at Republic Refrigeration and Airco, where his interest was sparked and he began his apprenticeship. Craig went on to work for Republic Refrigeration and Airco for two years thereafter, before moving to ACS, Air-conditioning and Pump Installations, where he worked for the next 10 years.
In 1999 Craig opened his own company and CS Air was born. Over the respective 18 years CS Air has worked on many exciting projects, and found it’s specialty in central plants particularly chilled water plants.
A current example of an exciting project that CS Air is working on, is the systems installation for the new Cornubia Virgin Active. Virgin Active has been a client of CS Air for nearly 25 years, and CS Air has been involved in the majority of Natal’s Virgin Active installations. Another project that CS Air has been able to “sink their teeth into” of late, is the new Sibaya Dunes development, which involves the installation of large Samsung VRV systems in the presidential apartments.
Craig is very passionate about what he does, and he states that his passion comes from his love of the challenge the HVAC industry provides. One of the major challenges of the industry is the technological advancements, which companies must keep abreast of. However Craig stated, that with the support of suppliers who bring in products that allow CS Air to provide the greatest efficiency and cost effectiveness to its clients, these challenges can be overcome.
Afcon Answers
What is the difference between Ethylene Glycol and Propylene Glycol?
What You Need To Know
Both ethylene glycol and propylene glycol solutions will effectively lower the freezing point of water allowing it to be freely pumped through a variety of heat exchangers, and can be used interchangeably for most applications. While there are many minor variations in the properties between ethylene glycol and propylene glycol solutions, however there are two key differences that dictate which of the glycols is chosen for a particular application, namely toxicity and viscosity.
Toxicity
Ethylene glycol is more toxic than propylene glycol. About 2 - 4 ounces of ethylene glycol can be fatal if ingested by an adult human. Whereas, propylene glycol is a food additive and is not harmful to humans if ingested in moderate amounts. Therefore, propylene glycol solutions are preferred for many applications, particularly when human exposure can occur.
Viscosity
While differences in viscosity between ethylene glycol solutions and propylene glycol solutions at elevated temperatures are minimal, at temperatures below -18C the viscosity differences become significant. If heat transfer at these low temperatures is required, ethylene glycol solutions should be used. In addition, ethylene glycol solutions will require less pumping horsepower under cold conditions. If these liquid characteristics are important, ethylene glycol is usually chosen for the application.
Why you need Major Tech Tools today
What is “Dew Point”?
Which fouling factors are suggested for the selection of shell and tube heat exchangers?
The fouling factor is important for the selection of an evaporator. The values suggested to input in selection software are:
For evaporators:
- Normal water in closed circuit: 0,000043 m2K/W;
- Water in open circuit: 0,000086 m2K/W;
- Solutions with glycol <40%: 0,000086 m2K/W;
- Solutions with glycol >40%: 0,000172 m2K/W.
For condensers:
- Normal city water: 0,000043 m2K/W;
- Treated tower water: 0,000043 m2K/W;
- River water: 0,000086 m2K/W;
- Solutions with glycol <40%: 0,000086 m2K/W;
- Solutions with glycol >40%: 0,000172 m2K/W.
Eberle AC Controls
Eberle is a leading European brand that manufactures energy efficient residential and commercial heating and air-conditioning controls. Eberle has over 80 years of experience and prides itself on reliability, quality, technical excellence and sustainable production.
Afcon holds a wide range of, reasonably priced, Eberle controls. This range includes controls with dual heating and cooling options as well as single function controls. We also offer the choice of LED indicators and models with proportional outputs for heating and cooling.
For more information on Eberle AC Controls, and controls technical specifications, click here . . .
GOING GREEN IS COOL
This phase down is being achieved through the introduction of quota allocations and sectorial bans on high-GWP HFCs as well as multiple governments taking further steps to reduce the use of refrigerants with a substantial impact on the environment.
Bitzer has expanded their range of compressors to meet this need for environmentally sustainable refrigeration. The Bitzer Ammonia Compressor Pack (ACP) does just that. Bitzer’s ACP is designed for a wide range of operations in high, mid and low temperature applications in industrial refrigeration and process cooling.
Technical specifications
- Available with a capacity range of 100 to 450 TR
- Modular compressors units comprise up to 3 compressors
- Compressor packs can be connected (up to 9 compressors) and connected to a single controller
- Equipped with frequency inverter
- Common oil separator
Advantages
- Optimal part load performance
- High efficiency: individual compressors can be turned on and off depending on requirements
- Maximum redundancy for high operating reliability: system has multiple ammonia screw compressors which increases its reliability over single industrial compressors
- Bitzer advanced oil management system
- Reduced installation costs
- Durability
- Fast availability for all replacement parts
For more infoamtion . . .
What does “Approach” mean in heat exchangers?
Bitzer Compressors and Ammonia Seminar
Following the success of last year’s Roadshow Bitzer South Africa offered another Road Show event in Durban yesterday, covering Bitzer compressors and Ammonia applications.
The event was held at the Durban Country Club. And was a great success. Thank you to all who attended, and to Bitzer South Africa for hosting.
If you are interested in the information discussed at this seminar . . .
What is “Bubble Point”?
The bubble point is the temperature at which a liquid forms bubbles (usually the lowest boiling point of one of the constituents of a mixture like R407C).