Laboratory design standards have changed significantly over the years. But personnel safety hasn’t changed and continues to be the top priority in a lab space. As technology continues to improve at a rapid pace, design engineers are presented with new innovations that not only improve safety measures but also open the door to simplified solutions and energy-saving opportunities.

A Little History

Airflow control in labs and other critical applications requires precision. Lab design has shifted from energy-burning constant volume spaces to VAV designs thanks to fast-acting airflow control valves and fume hood face velocity control. Another improvement has been individual fume hood exhaust stacks which are being substituted for large, condensed, high-plume fan systems.

Many decades ago, the venturi airflow control valve provided the market with a device that delivered long-term stability and could properly maintain room pressurization. This valve has been the market standard for a long time due to its VAV capability and lack of adequate replacement.

In 2006, the AccuValve^® was released and offered the industry an airflow control valve that brought a slew of significant improvements to the table. The AccuValve gave a building automation system (BAS) much greater transparency through highly accurate airflow measurement. It also simplified installation requirements (no need for straight runs or additional hardware), causing fewer headaches for installing contractors and engineers. But most importantly, the AccuValve offered much lower pressure drop at design airflows.

Low Pressure Drop

Airflow control devices inherently add pressure drop to a duct system. This pressure drop is incorporated into the lab airflow design and affects the static pressure the system needs to generate. Subsequently, this determines the amount of energy the system will use to operate properly. Ductwork design and low-pressure drop devices are keys to designing an energy-saving mechanical system.

AccuValve Compression and Regain

When sized based on differential pressure at maximum design CFM, an AccuValve system can be selected at 0.2″ wc of pressure drop across each valve. This low operating pressure drop is accomplished in the AccuValve by compressing the air to increase the velocity, thereby making the airstream more laminar. In addition, a static pressure regain section after the control blades further reduces the pressure drop of the valve. In comparison, venturi valves must operate well above their stated minimum pressure of 0.6″ or 0.3″ wc to ensure they are controlling properly.

The AccuValve does not rely on duct pressure to modulate and control airflow as a traditional venturi airflow control valve does. By directly measuring airflow for control, the AccuValve can achieve precise control while operating at very low pressure drops.

Demand Based Static Pressure Reset Control

The goal of Demand Based Static Pressure Reset Control is to operate the mechanical system at the minimum static pressure while allowing the controls to maintain a safe environment in the lab. The BAS monitors the position of each airflow control valve and determines which valves are most open (i.e., the largest control output). If the control output of the valves that are most open is below 80%, the BAS reduces the duct static pressure setpoint and then again looks at the position of each valve, determining the valve(s) that are most open. This continues until the most open valve is approximately 80% open, which ensures that the system is operating at the minimum pressure and that there is enough pressure in the system to allow the controls to operate, maintaining a safe lab environment.

It is worth noting that this control scheme cannot be used with a mechanical venturi-type airflow control valve without adding additional control devices. A venturi derives its pressure independence from a spring and plunger in the airstream. The spring and plunger combination is used to compensate for changes in static pressure in the duct. The shaft of the venturi valve is “commanded” to a position where it is calibrated for a given flow. The spring/plunger then compensates for static pressure changes in the system. Therefore, regardless of the static pressure in the duct (between 0.6″ and 3.0″), the valve will always be “commanded” to the same position for a given CFM. Control output or valve position is not indicative of the true position of the spring/plunger, so this signal cannot be used to reduce the duct static pressure.

The AccuValve provides “Ready” Demand Based Static Pressure Reset without the need for additional hardware. Since the AccuValve is not a mechanical device and actually measures airflow, the valve will modulate to whatever measured position that is required providing the desired airflow. If the static pressure in the system is high, it will modulate to a more closed position, and if the static pressure in the system is lower, it will modulate to a more open position. Since valve position is directly monitored, system static pressure can be reduced to the point where no Accuvalve is more open than 80%.

No Straight Runs Required, Mounting at Any Angle

Measuring duct airflow accurately depends on the airflow sensor having a uniform velocity profile, no matter what the airflow sensing technology. This requirement is often met with straight duct runs before and after the airflow sensor. However, tight HVAC spaces sometimes make this difficult or even impossible to implement.

The design of the AccuValve eliminates the need for straight duct runs before and after the valve. Its compression and regain sections condition the airflow by reducing turbulence and accelerating the air allowing for stable measurement and higher valve turndown. This is particularly important for labs and other critical environments where it is necessary to measure airflow accurately to meet safety requirements.

AccuValve with 90° Elbow at Inlet

Even with a 90° elbow at the inlet, the AccuValve can deliver laminar airflow allowing velocity to be accurately measured by the vortex shedding airflow sensors. The elimination of straight run requirements means simpler duct layouts and design, as well as cost savings. The AccuValve can also be mounted at any angle, unlike a venturi valve which must be ordered from the factory (and installed) in either a horizontal or vertical mounting arrangement. This is another benefit to the designer and installer when faced with tight HVAC spaces.

Energy Savings, Low Environmental Impact

The unique, award-winning design of the AccuValve delivers reduced operating costs and a lower environmental impact and carbon footprint. Saving energy is one of the most important issues in new building design and retrofitting today. Until renewable clean energy is readily available for all buildings around the world, individuals and companies will continue to focus on energy-saving methods. This focus and commitment are only growing more as time moves on and our environment becomes more damaged. Airflow control systems will continue to evolve with this trend, making options like AccuValve more appealing to building owners and engineers alike.

For further information about using AccuValve in your lab space, please call us at 203-261-8100 or email us.

Kevin Stettnisch

Applications Engineer

As an Applications Engineer, Kevin assists the sales team in a variety of different areas, including product selection, submittal documentation and proposals. He also shadows job site visits with other sales engineers to expand his knowledge of project design, product troubleshooting and communicating with other engineers, contractors, owners and end users.

Kevin is competent in Spanish and holds a Bachelor of Science degree in Mechanical Engineering from Lafayette College in Pennsylvania.

Kris Hess

Project Manager

Kris has over 23 years of experience in the HVAC industry specializing in the design and installation of laboratory control systems. His solid systems and HVAC industry knowledge combined with his thorough and in-depth analytical skills allows him to deliver consistent, positive results for our clients. Kris has an aptitude for understanding new products and approaches and takes pride in establishing and maintaining long-term relationships with each customer he supports.

Kris’ control systems certifications include: Easy IO CPT, Niagara AX, Honeywell Excel 5000 CARE and Tek-Air Smart Lab Control Systems.

Nicole Tierney

Office Administrator

As an Office Administrator, Nicole handles office and service administration tasks in our Danbury, CT location.

She has experience as a customer service representative, a sales coordinator and a strong background in customer service and sales support.

Cathleen Rugulo

Office Administrator

Cathleen manages the administrative activities for Accuspec's NJ office. Her background includes managing business finances, back office operations and client relations.

She holds degrees in education and english, and taught kindergarten through 6 grade science and creative writing in private schools in New Jersey and California.

Toni Avallone

Office Manager

Toni joined the Accuspec team in 2019. She maintains and organizes administrative activities including AR/AP, customer and vendor support, and various other office operations and procedures. She has over 14 years of experience in handling a wide range of office management and executive assistant related responsibilities for both small and global businesses. Toni works closely with the Accuspec team members, assisting with the company’s diverse needs.

Toni holds a BA in Communications from Western Connecticut State University, as well as an MS in Education from the University of Bridgeport.

Ryan Katkocin

Assistant Project Manager

As Assistant Project Manager, Ryan reviews engineering documents, prepares submittals and works with mechanical contractors to drive projects to completion. He brings extensive experience as an operations manager, loan processor and underwriter to Accuspec. He has worked closely with government agencies, utility companies, design engineers, and financing agents.

Ryan holds a B.A. in Economics from Marist College, in Poughkeepsie, NY and an M.B.A. from the University of Connecticut.

Chris DeStefano

Service Manager

Chris has been with Accuspec since 2002 and oversees all service offerings including turnkey laboratory airflow control projects, ongoing testing, preventative maintenance and repair services. He also serves as an important technical advisor to Accuspec's sales staff.

Chris's formal training includes ACCA's (Air Conditioning Contractors of America) programs on heating and cooling loads and duct sizing. He has also participated in numerous training programs offered on airflow control systems and products.

Chris holds a Bachelors of Science Degree in Economics from Quinnipiac University.

Sam Hall

Sales Engineer

Sam spent three years in an Application Engineering role at Accuspec before moving into the Sales Engineer position. In that role, he worked closely with the sales team supporting projects at each phase: design, pre-sale, and post-sale.

Sam has extensive experience in analyzing, estimating, and submitting on laboratory projects, along with other markets Accuspec specializes in.

Sam holds a Bachelor of Science degree in Mechanical Engineering from Penn State University.

Lucas Rowe

Sales Engineer

Lucas Rowe holds a Bachelor of Science degree in Electrical Engineering from The University of Connecticut in Storrs. While earning his degree, Lucas worked summers for a plumbing and heating company in Albany, NY focusing on residential, commercial and public sectors.

As an application engineer with Accuspec, Lucas worked closely with the sales team on designing and supporting jobs on a pre-sale and post-sale basis. Lucas’ current responsibilities included reviewing design documents, generating submittal documentation and creating sequences of operations to meet design requirements. He has worked on over 50 laboratory projects including Amherst College New Science and Engineering Complex (a 6 story, 250,000 sq. ft. facility).

Kristen Marshall

Vice President Brand Engagement

With over 25 years in the marketing industry, Kristen is a motivated, high-performing leader with a proven track record in growing revenues, increasing operating profit, and leading teams to achieve corporate objectives.

In her latest role as VP, Brand Engagement for Accuspec, she leads both the Human Resources and Marketing disciplines to attract high caliber talent and create strategy that produces more effective execution, higher productivity, and disruptive innovation for the company. She ensures that both areas are focusing on the same objectives but applied to different audiences. This collaboration allows Accuspec to stand out in an already saturated market, by building its brand and increasing awareness with clients.

Education includes B.S. in Marketing from Clemson University, M.B.A. in International Business from Fairfield University and currently enrolled in the M.A. in Psychology program at New York University.

Bill Theel

Senior Sales Engineer

Bill works closely with the end-user, consulting, and contracting communities to specify and apply Accuspec's products over a wide array of facility types. He is well known and highly regarded in these communities, and is often viewed by his clients as a trusted advisor.

Bill had an excellent systems related background both on the end-user and provider sides of the business. He has overseen numerous projects to improve quality, efficiency and safety and was responsible for the construction of a major sterile-filling facility.

Bill holds a B.S. in Chemical Engineering from Rutgers University, and is currently an active member of the International Society for Pharmaceutical Engineering (ISPE).

Brian Simkins

Senior Sales Engineer

Brian's primary responsibility with Accuspec is to interface with consulting engineers and owners to assist them in designing, installing and commissioning critical HVAC and airflow control systems. Although Brian is a very well-rounded individual, he has particular expertise in the utilization of descant dehumidification for low-dewpoint and dedicated outside air applications.

Brian has been published in several magazines on topics such as make-up air and humidity control systems, arena commissioning, and energy efficient design. He has presented many times on desiccant technology topics including Part Load Dehumidifier Performance, Humidity Control for Cold Storage Load Docks, and Desiccant Based Make-up Air Systems for Ice Arenas.

Brian holds a Bachelor of Science degree in Mechanical Engineering from Northeastern University, Boston MA. Brian serves on the Board of the Long Island chapter of the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) and is an active member in the United States Green Building Council (USGBC).

Jonathan Savona

Senior Sales Engineer

Jon has been with Accuspec since 2001, specializing in critical airflow control design in the Pharmaceutical/Biotech, University, and Healthcare markets. His industry experience also includes project engineering, and project management for large critical environment projects.

Jon has built and maintains many strong relationships with consulting engineers, architects, facility owners, and contractors throughout the Northeast. He works closely with clients in Connecticut and Central/Western Massachusetts.

Jon is a Past President of the International Society for Pharmaceutical Engineering (ISPE) New England Chapter (now Boston Chapter) and also held positions as Co-Chair and Chair for ISPE International Student Development Council based out of Tampa, FL. He is also an active member of the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE).

Jim Brech

Senior Sales Engineer

Jim has been with Accuspec since 1989. His primary responsibility has been to interface with consulting engineers, owners, and contractors to assist them in designing, installing and commissioning laboratory air flow control, desiccant dehumidification systems and exhaust air systems. Jim has a wealth of experience in laboratory exhaust systems in the research and education sectors and has also been involved with numerous projects for archival storage. He has been honored as the top producing representative in the country for Strobic Air.

Jim holds Associates Degrees in both Electronic Technology and in Marketing Management and is an active member in the American Society for Heating, Refrigerating and Air Conditioning Engineers (ASHRAE).

Jeff Siemasko

Vice President

Jeff joined Accuspec in 2019 and specializes in critical airflow control in the pharmaceutical/biotech, school/university, and healthcare markets. His background includes sales/application engineering, marketing, business development, direct sales, and sales management. He also has extensive experience managing employees and manufacturers’ representatives.

Jeff has designed a large number of HVAC systems to provide precise temperature and humidity control for many demanding applications. He has also contributed to numerous articles relating to the use of desiccant dehumidification in many different industries including food processing, pharmaceutical manufacturing, and health care. Jeff works with clients in Eastern and Central Massachusetts, New Hampshire, Maine, and Rhode Island.

Jeff received a Bachelor of Science in Mechanical Engineering from Worcester Polytechnic Institute and a Master’s in Business Administration from the University of New Hampshire. He is a member of the American Society for Heating, Refrigerating and Air Conditioning (ASHRAE).

Craig Marshall

Principal

Craig oversees the sales activities at Accuspec's Connecticut office, and directly serves clients in the consulting engineering, end-user, and contracting communities.

Craig has been with Accuspec for more than 20 years, first as a Project Engineer and then as Vice President. His primary responsibility has been to interface with consulting engineers and owners to assist them in designing, installing and commissioning laboratory air flow control and desiccant dehumidification systems. Craig has designed over 100 low humidity spaces for manufacturing areas, archival storage areas and hospital operating suites. He has also designed over 80 airflow control and pressurization systems for the R&D laboratory marketplace, hospital isolation rooms and pharmaceutical manufacturing areas.

Craig received a Bachelor of Science in Mechanical Engineering from the State University of New York at Buffalo, and is a licensed Professional Engineer in the State of Connecticut.

Energy-Saving Laboratory Design

A Little History

Low Pressure Drop

Demand Based Static Pressure Reset Control

No Straight Runs Required, Mounting at Any Angle

Energy Savings, Low Environmental Impact

Products for HVAC Systems

HVAC Systems Solutions

HVAC Systems Project Profiles

HVAC Resources

About

Contact

Kevin Stettnisch

Kris Hess

Nicole Tierney

Cathleen Rugulo

Toni Avallone

Ryan Katkocin

Chris DeStefano

Sam Hall

Lucas Rowe

Kristen Marshall

Bill Theel

Brian Simkins

Jonathan Savona

Jim Brech

Jeff Siemasko

Craig Marshall