Chilled Water Coil – Circuiting Made Easy

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Chilled Water Coil – Circuiting Made Easy
(Credit to Guest Blogger: Dan Jacobs, Capital Coil & Air)

Circuiting a chilled water coil is one of life’s great challenges in the coil business. You’re bound to run across folks with years of experience in the industry that can not effectively explain this concept. While not the most exciting of subjects, the necessity of circuiting chilled water coils can not be overstated. Capital Coil & Air has attempted to simplify the idea of circuiting as much as possible.

For starters, circuiting a chilled water coil is ultimately up to the performance of that coil. Circuiting is really a balancing act of tube velocity and pressure drop. In other words, think of a coil as a matrix. Each coil has a specific number of rows, and a specific number of tubes within each row. For example, a chilled water coil might be 36 inch fin height and 8 rows deep. The coil has 24 tubes in each row, and multiplied by 8 rows, there are a total of 192 tubes within the coil. While you can try to feed any number of tubes, there are only a few combinations that will work.

  • Feeding 1 tube – you will be making 192 passes through the coil, which will essentially require a pump the size of your car to make that process work.
  • Feeding 2 tubes – equates to 96 passes, and your pressure drop will still be enormous.
  • Feeding 3 tubes – 64 passes, which is still too many.
  • Feeding 4 tubes – See above.
  • Feeding 5 tubes – Impossible as 5 does not divide evenly into 192 (passes).

To learn more, read entire article by Dan Jacobs, Capital Coil & Air, 06/28/2019

Related Blogposts:
Coils – Repair or Replace 
Coils – Construction vs. Performance
Cooling Coils and Moisture Carryover

Featured Manufacturer:
Capital Coil and Air is the leading manufacturer of commercial OEM HVAC replacement and custom design/build booster coils, fan coils, condenser coils, and DX Coils.
For More Information - askRick

 

 

Project Snapshot: Beverly Middle School | Thermo-Composite DX Units

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Project Name: Beverly Middle School
 Architect: Ai3 Architects
Mechanical Engineer: Griffith and Vary
Mechanical Contractor: PJ Kennedy & Sons
Equipment: 13 Rooftop Units with DX
Manufacturer: Annexair
Size: 5,700, 5,100, 6,800, 5,400, 4,500 5,600, 6000, 6,300, 5,750, 4825, 4,700, 6,600, 7,800 CFM
DAC Sales Engineer: Pat Will

Project Overview:

The City of Beverly embarked upon an exciting and much-needed effort to design and construct a new middle school to give students a learning environment enriched with the tools necessary to provide the highest quality educational experience.The project included construction of a new 231,509 SF, 1,395 student middle school serving grades 5 through 8. The project included a 4-story classroom core with each floor dedicated to one grade and a common outdoor learning area. The project included a 535 seat auditorium, a 352 seat cafeteria on the first floor for grades 5 & 6 and a 352 seat cafeteria on the third floor for grades 7 & 8, a gymnasium, classrooms, media center and administration spaces.

HVAC Highlights:

  • Hot Water Coils
  • DX Coils
  • Enthalpy Wheels
  • Thermo-composite panel system

The units at the Beverly Middle School were supplied by Annexair and incorporated their Thermo-composite panel system.  The design looked for replacement units that would weigh the same as original and provide 30% more capacity.  Weight was a key design factor.  The Annexair units are 30% lighter than traditional steel units, so we were able to satisfy the design criteria with a lighter unit.  Additionally, the units come with a lifetime warranty against corrosion.  Best of all they are the same cost as traditional steel units.

Outdoor units have a rain gutter above each access door and a watertight roof shall be provided with a

white TPO UV-reflective membrane. Units have the entire exterior finished with a PVDF coating designed for UV resistance. Panels needed to pass ASTM B117 3000-hour salt fog resistance test and ASTM D4585 3000-hour moisture condensation resistance test. In addition, the paint needed to meet AAMA 620-02 standard for color, chalking, gloss retention, and abrasion resistance. The air handler unit casing was provided with a lifetime warranty against corrosion resistance under normal use.

For More Information - askRick

 

 

 

Green Material for Cooling Identified

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Researchers from the UK and Spain have identified an eco-friendly solid that could replace the inefficient and polluting fluids used in most refrigerators and air conditioners 


When put under pressure, plastic crystals of neopentylglycol (NPG) yield huge cooling effects—sufficient to make them competitive with conventional liquid coolants. In addition, the material is inexpensive, widely available and functions at close to room temperature. Details are published in the journal Nature Communications.

The fluids currently used in the vast majority of refrigerators and air conditioners—hydrofluorocarbons and hydrocarbons (HFCs and HCs)—are toxic and flammable. When they leak into the air, they also contribute to global warming.

“Refrigerators and air conditioners based on HFCs and HCs are also relatively inefficient,” said Dr Xavier Moya, from the University of Cambridge, who led the research together with Professor Josep Lluís Tamarit from the Universitat Politècnica de Catalunya. “That’s important because refrigeration and air conditioning currently devour a fifth of the energy produced worldwide, and demand for cooling is only going up.”

To solve these problems, materials scientists around the world have sought alternative refrigerants that are solids. Moya, a Royal Society Research Fellow in Cambridge’s Department of Materials Science and Metallurgy, is one of the leaders in this field.

In their newly-published research, Moya and collaborators from the Universitat Politècnica de Catalunya and the Universitat de Barcelona describe the enormous thermal changes they achieved by putting plastic crystals under pressure.

Conventional cooling technologies rely on the thermal changes that occur when a compressed fluid expands. Most cooling devices use fluids such as HFCs and HCs. As the fluid re-expands, its temperature drops, cooling its surroundings.

With solids, cooling is achieved by changing the material’s microscopic structure. This change can be achieved by applying a magnetic field, an electric field or a mechanical force. Despite decades of work, the caloric effects achievable with a variety of solids have fallen far short of the thermal changes available in fluids. The discovery of colossal barocaloric effects using a plastic crystal of neopentylglycol, and other related organic compounds, has leveled the playing field.

Due to the nature of their chemical bonds, organic materials are easier to compress. In addition, NPG is widely used in the synthesis of paints, polyesters, plasticisers and lubricants. It’s not only widely available, but also is inexpensive.

NPG’s molecules, composed of carbon, hydrogen and oxygen, are nearly spherical and interact with each other only weakly. These loose bonds in its microscopic structure permit the molecules to rotate relatively freely.

The word “plastic” in “plastic crystals” refers not to its chemical composition but rather to its malleability. Plastic crystals lie at the boundary between solids and liquids.

Compressing NPG yields unprecedentedly large thermal changes due to molecular reconfiguration. The temperature change achieved is comparable with those exploited commercially in HFCs and HCs.

The discovery of colossal barocaloric effects (CBCE) in a plastic crystal should bring barocaloric materials to the forefront of research and development to achieve safe environmentally friendly cooling without compromising performance.

Moya is now working with Cambridge Enterprise, the commercialization arm of the University of Cambridge, to bring this technology to market.

(Article provided by the University of Cambridge – Enterprise, 04/18/2019)

For More Information - askRick

 

Konvekta Reduces Energy Consumption up to 80%!

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GROUND BREAKING!

High-Efficiency Run Around Energy Recovery Systems Reducing Energy Consumption up to 80%!

FIRST there were glycol run around loops
40% efficiency
THEN came plate and frame heat exchangers
60% efficiency
NEXT came heat recovery wheels
70% efficiency

NOW, high-efficiency energy recovery coils
UP to 80% EFFICIENCY!

Konvketa guarantees the amount of energy recovered!

 

 

 

 

 

 

Revolutionary Benefits

  • No Cross-Contamination of Intake and Exhaust Air
  • Unrestricted Location of Intake and Exhaust
  • Reduced Heating and Cooling Load
  • Existing HVAC-Systems Can be Retrofitted

Recent Success Story

A client could not meet energy code requirements with their current design. Konvekta worked with this client to not only meet the energy code, but the new design will also save them over $800,000 per year on a 600,000 CFM outside air system!

Without Heat Recovery Konvekta Savings
Heating $640,000 $40,000 $600,000
Cooling $960,000 $725,000 $235,000

Annual Savings = $835,000

Contact Us to help design your next energy recovery project with Konvekta.

Seresco NV: Dehumidification Through Ventilation

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Seresco NV: Using naturally dry outside air to remove moisture

Not every project requires compressors for dehumidification. In fact, the market for ventilation-only pool dehumidifiers is worth about $60 million per year in North America. You can take a piece of that pie, with the Seresco NV: dehumidification through ventilation.

The NV uses naturally dry outside air to remove moisture, unlike other Seresco products which use refrigeration technology to do the job. It’s also capable of providing up to 70,000 CFM supply air, making it a good fit for lots of different applications.   

Product Features and Benefits  

  • Plenty of airflow – 4,000 to 70,000 CFM of supply air.  
  • Automatically adjusts outdoor air usage for best possible conditions and lowest cost, using CommandCenter® control system.  
  • Save money on outside air pre-heat during cold weather with heat recovery through a highly efficient glycol runaround loop.
  • Auxiliary heat options, including gas furnaces for packaged unit needs.  
  • Sensible cooling is possible with a chilled water hookup or DX cooling.  

Let’s take a look at some application examples for the NV.  

Dry Climates  

Any pool facility in a dry climate is a candidate for the NV because it can maintain space conditions for a higher percentage of the year, simply by using the air outside to ventilate the natatorium.  

Indoor Water Parks  

These facilities, with their great expanses of water coupled with lots of patrons and plenty of splashing, are often too much for traditional dehumidifiers to handle. The NV can handle this load while satisfying the facility’s excessive outdoor air requirements because of the large number of patrons.  

Where Control Isn’t Everything  

The NV is great for bringing in lots of outdoor air, but during extreme conditions that isn’t enough to control the conditions of the space without additional treatment of the air.  

But what if the owner doesn’t care?  

A facility, for example, may have a retractable roof and French doors that can open when it’s very hot and humid out to turn into an outdoor pool. When it does that, the unit is off and the owner has given up control of the space.   

In situations like this, the NV is fine for the cooler parts of the year where it has an easier time maintaining conditions.  

While it works best in dry climates, the NV can be used anywhere – as long as the owner understands its limitations.   

Pros and Cons to Remember  

The NV presents a lower upfront cost than a compressorized unit. Additionally, it needs less electricity to run, so facilities in places where electricity is very expensive or in short supply (like remote areas) may also find this product attractive.  

But ventilation-only units still typically cost more to run than compressorized units. This is because a compressor unit uses a minimum of outside air and recycles latent energy into the pool water and into the air. A ventilation unit throws that away and brings in fresh air — you must heat the air and the water (the NV comes standard with a glycol runaround loop for cold air pre-heat, to reduce these costs.)  

The Bottom Line  

The NV has many benefits, applicable to specific situations. When looking at the NV, it’s a good idea to be clear with the owner what the limitations are and to do a full cost analysis to see if it is suitable.  

Please contact us to discuss your dehumidification applications.

Featured manufacturer:
Seresco

For More Information - askRick

 

Three Key Advantages of AGronomic IQ’s Dry Coolers

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AGronomic IQ’s dry coolers eliminate refrigerant leaks in grow rooms.

What you may not know about grow rooms is that a refrigerant leak can kill the entire crop in under 24 hours, so it’s really important to minimize the risk of that ever happening. 

Agronomic IQ virtually eliminates the risk by using its proprietary dry coolers as the outdoor heat rejection devices. They offer the ultimate in redundancy and scalability for customers, allowing you to place one, two or 20 (or more!) in one job to meet the demands of the facility. 

Here are three big advantages to Agronomic IQ’s dry coolers:

They save money

AGronomic IQ’s dry coolers have many elements that are attractive to potential customers, but one is undoubtedly their ability to save money. Because they use glycol as their coolant, refrigerant charge is dramatically decreased. You can also use PVC to virtually eliminate on-site refrigerant work, cutting installation costs. Finally, the dry cooler couples with their patent-pending economizer cooler, saving more than 30% in energy costs in cool climates!

They’re good for the environment – and the crop

Environmental stewardship is something we know customers in the indoor agriculture market care very deeply about. That’s why they love that AGronomic IQ’s dry coolers don’t use environmentally-harmful coolant. As well, their equipment virtually eliminates the risk of a plant-killing refrigerant leak! 

Superior cooling even in winter

Agronomic IQ’s dry coolers do not suffer from low-ambient concerns which plague the air-cooled condensers found in conventional split DX systems. This industry is unique by requiring 100% cooling capacity in the dead of the winter – AGronomic IQ’s dry cooler units have no problems providing it!

Please contact us to discuss your climate control grow room applications.

Featured manufacturer:
AGronomic IQ

For More Information - askRick

 

ACEEE 2018 State Energy Efficiency Scorecard

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Massachusetts Ranks #1 as Most Energy Efficient State for 8th Year in a Row 


As the US government loosens environmental rules, states are investing more in energy efficiency and delivering increased power savings, according to the 2018 State Energy Efficiency Scorecard. This 12th annual report from the American Council for an Energy-Efficient Economy (ACEEE), identifies the leaders and once again, Massachusetts came out on top.

The scorecard offers mostly good news about energy efficiency — the nation’s third-largest electricity resource. In response to federal efforts to freeze US vehicle and appliance standards, quite a few states worked to retain their own standards and to promote zero-energy buildings. Many states unveiled plans to boost investments in efficiency and clean energy, often driven by concerns about climate change.

The scorecard, which ranks states based on 32 metrics in six areas, had these key findings:.

  • Massachusetts continued to rank #1 overall. It launched a plan to set new three-year energy savings targets and approved utility spending for grid-scale modernization. A close second is California, which led efficiency efforts in three areas: buildings, transportation, and appliances. These leaders are followed by Rhode IslandVermontConnecticut, New York, Oregon, Minnesota, Washington, and Maryland.
  • More states pushed for zero-energy construction (buildings that produce as much power as they use) largely through tougher building codes.  Vermont, Rhode Island, Oregon, Washington, the District of Columbia and Massachusetts have incorporated net zero-energy construction into long-range plans.

Massachusetts’ Governor Charlie Baker said: “We are proud Massachusetts leads the nation in energy efficiency for the eighth year in a row, and we will continue to adopt and pursue measures that deliver billions of dollars in savings to our residents and businesses each year. Massachusetts remains committed to leveraging energy efficiency and clean energy to meet climate goals, reduce costs and grow the Commonwealth’s economy.”

Preview the ACEE 2018 State Energy Efficiency Scorecard

For More Information - askRick

 

Amherst College Science Center | Pumped Glycol Energy Recovery System

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Project Name: Amherst College Science Center
 Architect: Payette Associates Inc.
Mechanical Engineer: Van Zelm Engineers
Mechanical Contractor: Harry Grodsky & Company
Equipment: Glycol Energy Recovery System with 20 AHU coils, 16 HRU Coils and Steam Humidifier
Manufacturer: Konvekta
DAC Sales Engineer: Rich Clarke

Project Overview:

During the past 15 years, enrollment in STEM classes increased 85 percent and to meet this demand, Amherst College has built its new Science Center.

In Fall 2018, the school opened the four-story, 250,000-square-foot New Science Center with state-of-the-art teaching and research facilities. The center includes a science commons that unites the five wings of the building.  It also includes classrooms, teaching labs, a library, café and informal learning areas for students. In addition to the new building, improvements were made to the infrastructure that serves the building as well as the Greenway Dorms. These upgrades include chilled beams in all laboratory spaces, radiant ceiling panels in offices and classrooms, displacement ventilation in all non-lab areas, radiant heating/cooling floor system in the atrium area, a high efficiency glycol run-around system, daylight dimming capability in all areas with natural light, and a storm water recycling system.
Learn more about the Science Center

Designed with Sustainability in Mind

Amherst gathered a world-class team of industry leaders to design a new type of science building. Leveraging new technologies, our team of architects, engineers and sustainability experts developed sophisticated solutions, using computational modeling to explore various options and refine the designs. Their resulting innovations set the stage for the Science Center to perform at an unparalleled level of energy efficiency. The average science building uses about 370 kiloBTUs per square foot per year. We intend to reduce that by 73 percent or more through a variety of features: highly efficient systems for everything from the building HVAC down to individual lab hoods; a state-of-the-art insulating building envelope; and careful floor plan design so that sensitive and specialized lab systems are grouped together.

Konvekta:   Unique Cost Transparency Concerning Energy Efficiency 

The HVAC system at the Amherst College Science Center was supplied by Konvekta and incorporates their glycol heat recovery units

Konvekta AG, founded in 1949, is one of the leading manufacturers of air/liquid lamellar heat exchangers.   The heat exchangers are custom designed for each application and manufactured in Switzerland.   They are primarily suitable for utilization in HVAC energy recovery.

Dartmouth College Burke Hall - Konvekta System

The Konvekta system is based on three core elements of a high-efficiency energy recovery system at their disposal:

• Highly efficient heat exchanger

Hydraulic assembly unit

System Controller – After installation of a Konvekta heat recovery system, the system controller continuously records the system operating parameters and transmits the data via the internet to Konvekta headquarters in Switzerland.  The Syskom software calculates the investment cost as well as the annual operating cost of entire HVAC systems (air-conditioning system, refrigeration plant including re-cooling). Depending on the customer’s interests, the system can be optimized through changes in operating conditions and variations of components. This computing service is free of charge for Konvekta customers.

Konvekta Pumped Glycol Coil

Konvekta Energy Recovery Coil

 

 

 

 

 

 

 

Featured Manufacturer:
Konvekta

For More Information - askRick

 

 

 

Coils — Repair or Replace

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Coils – To Repair or Replace
(Credit to Guest Blogger: Dan Jacobs, Capital Coil & Air)

There are multiple reasons why coils can fail prematurely. Sometimes, they simply freeze and can never be repaired. Other times, the coil was selected incorrectly, which in turn, made the coil significantly under-perform. Many times, there is substantial corrosion or something else in the system that causes the coil to fail. However, most coils, when selected correctly, and in systems that are properly maintained, can last anywhere from 10-30 years!  While 10-30 years is also a pretty wide range, there are many variables in how long you can expect a coil to perform. Factors, such as on-going maintenance, air quality, and water/steam quality all have an effect on a coil’s lifespan.

But what happens when you try to extend the life of a coil that has obviously reached the end of its usefulness?

Why Do Coils Fail of Old Age?

  • While the coil’s tubes are considered the primary surface, 70% of all coil performance is performed by the finned area on a coil, which is known as the secondary surface. The fin/tube bond is easily the most important manufacturing feature in any coil. Without the bond between the tubes and fins, the coil could never properly function. Like all things however, over time the fin/tube bond becomes less efficient with constant expansion and contraction. While the construction of the coil, as well as the fin collars, does not allow the fins on the coil to move, that fin/tube bond naturally weakens a coil’s life over time after installation. Because of this, it is not a stretch to say that a coil is easily 30% less efficient after (20) years.
  • Cleaning coils often pushes dirt to the center of the coil, and this occurs even more so on wet cooling coils. Just remember that coils can become great air filters if not properly maintained. The BTU output of any coil is in direct proportion to the amount of air going through the coil. If you decrease the CFM by 20%, you are also decrease the BTU’s.
  • Cleaning agents often corrode aluminum fins. Since every square inch of fin surface matters in performance, corrosion of the fin surface is always detrimental to the coil’s performance.

To learn more, read entire article by Dan Jacobs, Capital Coil & Air, 12/11/2018

Related Blogposts:
Coils – Construction vs. Performance
Cooling Coils and Moisture Carryover

Featured Manufacturer:
Capital Coil and Air is the leading manufacturer of commercial OEM HVAC replacement and custom design/build booster coils, fan coils, condenser coils, and DX Coils.
For More Information - askRick

 

 

Klimor EVO – Evolution of Air

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Please contact us to discuss your Klimor EVO applications.

Featured Manufacturer:
Klimor

For More Information - askRick