ASHRAE Design Guide for Dedicated Outdoor Air Systems (DOAS)

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Are you thinking about designing a dedicated outdoor air system (DOAS)? 

Make sure you have comprehensive guidance from industry experts to simplify and optimize DOAS design, installation, operation, and management. The ASHRAE Design Guide for Dedicated Outdoor Air Systems consolidates existing material to focus on the major issues while referring to supplemental sources for more specialized or in-depth information.

A DOAS uses separate equipment to condition all of the outdoor air brought into a building for ventilation and delivers it to each occupied space, either directly or in conjunction with local or central HVAC units serving those same spaces.

A DOAS system:

  1. improves humidity control
  2. reduces energy use
  3. simplifies ventilation design and control
  4. uses heating and cooling equipment that doesn’t provide ventilation and/or dehumidification (e.g., radiant panels or passive chilled beams)
  5. reduces installation cost.

See our blogpost on DOAS Systems by Swegon

New Look DOAS Units – less space, less noise, less cost

Comprehensive guidance from industry experts can simplify DOAS design, installation, operation, and management

DOAS is growing in popularity but is still a relatively new technology. The lack of DOAS exposure and experience means many systems designed and installed today don’t take full advantage of all the benefits DOAS can offer.  The ASHRAE Design Guide for Dedicated Outdoor Air Systems consolidates existing material to focus on the major issues while referring to supplemental sources for more specialized or in-depth information. 

Click here for your guide
152 pages / 2017 / $69 ($59 ASHRAE Member)

Guided by the information in this book, HVAC system designers will be able to optimally incorporate DOAS into their projects. Architectural designers, building developers and owners, maintenance professionals, students, teachers, and researchers may also find the contents useful.

For More Information - askRick

 

 

Oil Free Chillers are Smardt

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Why Oil in Chillers is Old School

Oil as a lubricant in a chiller makes for a significantly more complicated machine.  There is a complete system that is designed and maintained to allow oil to lubricate a chiller.

Check out this video which explains how the oil needs to supplied and maintained in a typical chiller.

Wow, that’s a pretty complicated system that creates significantly more maintenance requirements and possibilities of chiller failure.

Get Rid of Oil, Get Rid of Problems

Magnetic bearing, oil-free centrifugal compressors avoid significant maintenance and fail points.

Oil-free centrifugal compressor technology boosts energy efficiency, cuts operating costs and is now well-proven worldwide.

Smardt oil-free centrifugal compressors use magnetic bearings and variable-speed drive to deliver a quantum leap in IPLV efficiencies compared with conventional oil-lubricated centrifugal, reciprocating, scroll and screw compressors.

The totally oil-free Turbocor technology achieves the highest part-load efficiencies for chillers and chilled water systems (including water-, air- and evaporatively-cooled applications).

Proprietary magnetic bearings replace conventional oil-lubricated bearings, eliminating high friction losses, mechanical wear and high-maintenance oil management systems to deliver chiller energy savings of 35 percent and more over conventional chillers while ensuring long-term reliability.

Read more on Smardt Oil-Free Technology

For additional information, please contact us.

Featured Manufacturer:

Smardt

For More Information - askRick

 

Highest Performance in the Smallest Space — Konvekta’s New Generation System Controller Eiger

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Energy Efficiency at its Peak!

System performance and energy recovery rates of 70-90% are achieved with the new generation “Eiger” System Controller!

The special design of Konvekta’s high-performance coils with headers on both sides of the coil ensures cross-counter flow and achieves almost pure counter current. This is a prerequisite for high energy efficiency in energy recovery systems. At the same time, this minimizes coil depth and saves space in the air handler.

Recent developments in computing technology have made simulations of complex operating systems both possible and affordable. The latest generation system controller “Eiger” uses the most advanced technology making it the perfect solution for high performance run-around energy recovery systems (RAERS). The “Eiger” controller is specifically ideal for the complexity of multi-functional network systems. The “Eiger” provides continuous automatic operation
of the system as well as continuous efficiency monitoring. Based on actual operating conditions, the “Eiger” will continuously calculate optimal system settings to maximize efficiency. The “NOMINAL” values are compared to actual measured values and all deviations are reported. Only the comparison of the “NOMINAL” value with the actual measured value will determine if the system is running optimally.

System Controller “Eiger” uses Performance Maps of Heat Recovery Coils

Featured Manufacturer:
Konvekta

For More Information - askRick

 

AHU – Replace or Refurbish?

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Air Handling Units — Replace or Refurbish?

Related Blogposts:

Project Snapshot | Boston College – Air Handling Unit Refurbishment
Five reasons to Refurbish an Existing Air Handling Unit
Air Handling Refurbishment – A Viable Solution

Featured Manufacturers and Companies Associated with Unit Refurbishment:

For More Information - askRick

 

Project Snapshot: John Hannigan Elementary School | Thermo-Composite DX Units

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Project Name: John Hannigan Elementary School
 Architect: Turowski2 Architecture, Inc.
Mechanical Engineer: Griffith and Vary
Mechanical Contractor: KMD Mechanical
Equipment: 5 Rooftop Units with DX
Manufacturer: Annexair
Size: 6,050, 7,285, 10,200, 4,000, and 6,100 CFM
DAC Sales Engineer: Pat Will

Project Overview:

The students in the northern part of the South End peninsula are now walking through the doors of the brand new 74,000 square foot John Hannigan Elementary School which, unlike the one built in 1919, has a state-of-the-art cafeteria, gymnasium, and an art and music classroom.  Children at Hannigan had been attending the Sea Lab on Portland Street since 2006 when the roof collapsed at the old Hannigan.  The original Hannigan school was demolished and rebuilt with modern features that now serves 400 elementary students and houses the Family Learning Center, classroom sizes of 20 students for lower grades and 26 per class for higher grades and two pre-K classes.

HVAC Highlights:

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

The units at the John Hannigan Elementary 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.

Take a look at the specification for key features:
UNIT HOUSING SPECIFICATION (Thermo-composite) The unit housing shall be no-through metal with 2’’  Thermo-Composite and foam panel construction – interior and exterior. No-through metal construction will be inherent to all the component construction in the assembly. All panels and access doors shall be double wall construction with R14 foam insulation for every 2” of construction. All foam insulation must be Greenguard certified®. Unit casing will have no exterior condensation at interior AHU temperatures down to 43F while unit exterior conditions are maintained at 95 F dry bulb / 85 F wet bulb. The panels shall be tested in accordance with SMACNA and ASHRAE 111 to have a deflection of no more than L/1150 at 10’’ and withstand air pressures up to 8” w.c with less than 1% leakage. Fire resistance of the panel will be in compliance with UL 94.

Thermo-Composite panels with aluminum interior and exterior liners shall be provided for the entire unit construction, including but not limited to, walls, doors, floors, roof, interior partitions, and electrical compartment. The frame shall consist of anodized extruded aluminum profiles which incorporates a thermally broken construction; welded together for reinforcement and insulated for superior thermal performance. Base structure shall be fully welded and have integral lifting lugs which can be removed once the unit is installed. All roof and side wall seams shall be positively sealed to prevent water and air leakage. Panels will be non-load bearing type. Access doors shall be provided to all major components to facilitate quick and easy access. They shall be made from the same material as the unit casing and incorporate thermal break construction. Access doors shall be provided with open door guard locks shall have Allegis type latches. If access doors do not open against unit operating pressure, provide safety latches that allow access doors to partially open after first handle movement and fully open after second handle movement. Removable panels provided for equipment pull out for coil(s) sections shall have key tooled threaded insert fasteners and a minimum of one handle. Hinges shall be Nylon hinge type designed to open 180 degrees.

Outdoor units shall have a rain gutter above each access door and a watertight roof shall be provided with a white TPO UV-reflective membrane. Unit shall have the entire exterior finished with a PVDF coating designed for UV resistance. Panels shall be painted Annexair standard color. Panels shall pass ASTM B117 3000-hour salt fog resistance test and ASTM D4585 3000-hour moisture condensation resistance test. In addition, paint must meet AAMA 620-02 standard for color, chalking, gloss retention, and abrasion resistance. The air handler unit casing shall be provided with a lifetime warranty against corrosion resistance under normal use.

For More Information - askRick

 

 

 

Selecting High Plume Dilution Fans

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What to Consider When Selecting Fans For Your Application


When selecting a fan, I prefer to do so in a deductive fashion. In other words, try to understand everything you possibly can about the nature of the application and the details about what the fan is going to be doing. From there, you can actually use a process of elimination to back right into the appropriate types of fans.

1. Ventilation vs. Process or Ducted

You have several types of fans to choose from—such as axial, centrifugal, or mixed flow—but I think the first and best way to approach the task is to pay attention to the two general types of applications for industrial/commercial applications: ventilation or process/ducted. With general ventilation, the fan accelerates air and moves it from one side of an enclosure to another (like through a wall or roof).

With process or ducted applications, the fans are typically mounted in ducts or have other pertinences in the system that provide back pressure against the fan. These pertinences could be fume scrubbers, mist eliminators, sound attenuators, energy transfer devices, etc. As the air is accelerated through those systems, there is a wide range of pressure that the fan has to overcome. These fans work in contained environments and develop higher pressures than general ventilation fans.

2. Mounting

Once you determine the nature of the application (general vs. process or ducted), you need to consider how the fan will be mounted. In a general ventilation application, it is usually mounted to the roof or the wall. In a process or ducted application, it is typically mounted on a roof or pad with the duct coming into or discharging from the fan (or ducted both inlet and outlet).

Both ventilation fans and process/ducted fans can be mounted in either horizontal airflow or vertical airflow orientations.

3. Performance & Accessibility Requirements

The initial trait to determine in terms of fan performance is how much flow and pressure development the fan must be capable of generating. On the process or ducted type, there will typically be a broader range of pressure development requirements, depending on the nature of the system.

In terms of accessibility, where are you going to mount the fan, and how are you going to be able to access it for inspection, periodic maintenance, or replacement (if that ever becomes required)? What is the temperature and density of the air? These factors, along with the performance requirements, will affect the fan construction and fan material, as well as help you to determine whether it is best to have a direct or belt drive fan.

4. Noise Level, Efficiency, & Redundancy Requirements

Noise levels generated by the fan and efficiency are often considerations for selecting an appropriate fan. If low noise and high efficiency are required, it will have a significant impact on the size and type of fan that you will select.

You also need to think about whether the system is constant flow constant volume or variable volume and if you have a critical service system where redundancy is required in the fan equipment.

These traits need to be known in order to help optimize fan selection to satisfy your requirements. If you would like assistance with the selection process, contact us today.

Related Blogposts:

High Plume Dilution Fans – Now with Composite Plenums

Featured Manufacturer:
MK Plastics is the leading manufacturer of corrosion resistant industrial and commercial blowers, fans, and  ventilation systems. Patented in several countries, products are AMCA Certified for Air and Sound Performance

For More Information - askRick

 

ASHRAE’s Building Energy Quotient in Operation

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Announcing New Building EQ Portal
ASHRAE In Operation Rating

ASHRAE’s Building Energy Quotient (Building EQ) In Operation rating program provides a quick energy analysis that compares your building to similar buildings within the same climate, helps to identify means to improve your building’s energy performance, and provides data on Indoor Environmental Quality.

Two different evaluations can be used independently to compare a candidate building to other similar buildings in the same climate zone or together for an assessment of a building’s design potential compared to actual operation:

Now Available
In Operation compares actual building energy use based on metered energy information.

Coming Soon
As Designed compares potential energy use based on the building’s physical characteristics
and systems with standardized energy use simulation.

Building EQ Portal is the most comprehensive assessment platform providing actionable recommendations for today’s commercial and institutional buildings.

Features include:

• Online data entry and submission process
• Metered energy data exchange from ENERGY STAR™ Portfolio Manager
• Median EUI calculation aligned with ENERGY STAR™
• Building EQ Performance Score visible to all users on the main input screen at all times
• Redesigned label shows Building EQ Performance Score on a barometer/scale.
No more letter grades!
• Standard reports can be automatically generated by credentialed users
• Improved submission approval process
• Help and validation information is built into the system

Visit ashrae.org/BuildingEQ for more information.

Related Blogposts:

For More Information - askRick

 

High Plume Dilution Fans | Now with Composite Plenums

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K-Kore™ Composite Air Plenums and Energy Recovery Plenums

The perfect product to provide years of trouble-free operation, K-Kore Composite Air Plenums and Energy Recovery Plenums use the latest technology in composite construction materials that renders steel construction obsolete. Our patent-pending Fiberglass Reinforced Plastic (FRP) assembly will provide the ultimate in durability and equipment life.

K-Kore plenums are high quality custom designed exhaust systems for commercial, industrial and institutional applications where corrosive environments can rapidly destroy steel equipment. The product is manufactured from high quality reinforced composites that can be engineered to withstand any corrosive environment, from the acidic rain or wastewater treatment plants of industrialized cities to the chemical exhausts of university or hospital laboratories.

Why Composites?

Composite materials, once considered futuristic and expensive, are now commonly used for all high-tech manufacturing sectors, from aerospace manufacturing to the automotive industry. Metal construction is considered obsolete in most high-tech industries where any degree of corrosion resistance or longevity is required, and so the engineers at MK Plastics came together with a common purpose of keeping the HVAC industry up to speed with the pace of technological advancements in material design.

Pound per pound, composite construction is stronger, more durable, and significantly more corrosion resistant than coated metal construction. The thermal conductivity is extremely low, allowing a true no-through metal design over the entire depth of the panel, something unachievable with current metal design.

Composite History

The use of resin-infused fiberglass for marine construction began over 50 years ago in the 1960’s. The actual service life of this material is unknown since there has never been a failure in the industry due to corrosion through exposure to saltwater environments. K-Kore plenum construction uses the same resin-infused fiberglass design that will almost certainly shown no signs of corrosion after 50+ years in the harshest environmental conditions. In the conceivable event that the K-Kore unit outlasts the building in which it is installed, the material can be recycled in an environmentally friendly manner.

Composite Usage

Composites are everywhere in the world today. Look up and you might see an airliner from Boeing, Airbus or Bombardier pass overhead, with their high-tech composite bodies allowing greater range, fuel economy and longevity compared to their metal rivals. Sports cars, military vehicles, spacecraft and almost all other high tech construction industries make extensive use of composite construction. The HVAC industry, until now, has been lagging far behind the state of the art. MK Plastics is bringing the construction industry into the 21st century.

Advantages:

  • Lightweight construction. Up to 40% weight savings vs. steel construction.
  • True no-thru-metal construction throughout the entire cabinet depth.
  • Unlimited salt-spray resistance: FRP has over 40 years (and counting) of salt spray exposure with no detrimental effects.
  • Corrosion resistance: K-Kore™ Air Plenums are the only products that carry a 50 year expected service life without corrosion in most environments.
  • Flame Spread index of less than 25 when tested according to UL 723.
  • Acoustic Performance: Tested and certified acoustic performance of the composite skins and cores allows the highest level of acoustic performance. Acoustic software accurately predicts the unit performance based on independently certified results from ASTM E 90 and ASTM C 423.

Downloads

Contact us to learn more or visit the MK Plastics site to learn more.

Featured Manufacturer:
MK Plastics is the leading manufacturer of corrosion resistant industrial and commercial blowers, fans, and  ventilation systems. Patented in several countries, our products are AMCA Certified for Air and Sound Performance.

For More Information - askRick

Project Snapshot: Boston University – Theater Center

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Project Name: Boston University – Theater Center
 Architect: Elkus Manfredi Architects
Mechanical Engineer: Vanderweil
Mechanical Contractor: TG Gallagher
Equipment: Modular Chiller and Boiler Plant – Mechanical Enclosure
Manufacturer: Cambridgeport 
Size: Two 125 ton chillers, three CW pumps, three CHW pumps,
two HW pumps, one FC pump, two boilers, all piping and accessories and a fully packaged control system with a refrigeration monitoring system.
DAC Sales Engineer: Matt Tefft

Project Overview

Boston University now boasts a state-of-the-art multi-functional 250-seat studio theater complex and production facility housing space for scenery, prop, and costume shops, as well as faculty offices, design labs and teaching spaces, therefore uniting the theater community by combining the previously separated design and production spaces with the theater and opera performance programs.

Solution
Continuing their established relationship with BOND, TG Gallagher was brought on the team to install the HVAC system in the new theater. At the heart of the theater is a modular chiller and boiler plant that houses two 125 ton chillers, three CW pumps, three CHW pumps, two HW pumps, one FC pump, two boilers, all piping and accessories and a fully packaged control system with a refrigeration monitoring system.  The entire chiller plant was prefabricated at TG Gallagher’s prefab facility and was rigged on site in four packaged sections.  Taking the initiative to prefabricate to such an extent allowed TG Gallagher to complete the entire mechanical room offsite in a controlled environment.  This approach improves safety and quality control, decreases waste and simplifies the project logistics.

Related Blog Posts:

 

 

 

Coils — Construction vs. Performance

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Coils – Construction vs. Performance
(Credit to Guest Blogger: Matt Jacobs, Capital Coil & Air)

If you have ever dealt with commercial HVAC coils, you have probably come across numerous “industry terms” with little to no explanation as to what these terms actually mean. To further confuse you, some verbiage is specific to the actual construction of the coil, while others are only important when determining a coil’s performance. If you do not work with coils on a frequent basis, it is hard to decipher exactly what these terms are referring to. To help translate this industry verbiage, Capital Coil & Air has come up with a list/glossary of the most common and relevant terms that you are likely to come across on most coil jobs.

PERFORMANCE

  • AHRI (Air-Conditioning, Heating, and Refrigeration Institute): Developed industry standards for air conditioning, heating, and commercial refrigeration equipment. All of CCA’s coils are AHRI-certified, so you know you’re getting dependable quality and performance in every product.
  • Air Pressure Drop: Air Pressure Drop is a result of Flow Rate, Fin Type, Rows and Fins per Inch. In addition, on either Chilled Water or  DX (Evaporator) Coils, the air pressure drop is affected by the condensate on the fin surface.
  • Airflow (CFM): Cubic Feet per Minute, which refers to the amount of air flowing across the coil. A typical cooling coil should produce between 400-500 FPM. You want to avoid exceeding 550 FPM on all Chilled Water & DX Coils. Too little airflow means your coil is not running at peak capacity, while too much airflow can result in excess water carryover.

CONSTRUCTION

  • Casing Type: The supporting metal structure for tubes and the header. Different casing options include Flanged (standard), Slip & Drive, Inverted, Stackable, and Collared End Plates & End Plates only. Steam Coils require Pitched Casing to allow for adequate condensation drainage.
  • Casing Material: The coil’s casing can be made from a variety of different materials. Options include: 14 or 16 Gauge, Galvanized Steel; 304 or 316 Stainless Steel; Copper & Aluminum. Please contact us directly to see about options other than those listed.
  • Connection Material/Type: Standard connection types are MPT (Male Pipe Thread, threaded on the outside), FPT (Female Pipe Thread, threaded on the inside), ODS (Sweat Connections, no threads)

COIL DIMENSION

Related Blogposts:
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