Spa treatment for hotel HVAC system

09/13/2010


In January 2009, construction began on a new, upscale Renaissance Boston Hotel & Spa at Patriot Place in Boston. The building’s owner wanted a top performing, energy efficient HVAC system that had the capability to adjust airflow based on demand and would operate more quietly than traditional systems. Typical bathroom exhaust systems use oversized rooftop fans running 24 hours a day to assist in exhausting air from a common riser that multiple bathroom fans exhaust into. Unfortunately, these fans often run continuously, tend to be loud, use a great deal of energy, and exhaust excessive amounts of the conditioned air from the building.

The main challenge of this project was to design a cost-effective fan and control system that could reduce energy consumption and provide a variable exhaust flow based on the number of bathroom exhaust fans that were in use while still properly ventilating the guest bathrooms. The owner of the Renaissance turned to Buckley Associates, which proposed the Greenheck GreenVent system with Vari-Green motor to the design team at Zade Associates, over the traditional fan with a VFD and pressure sensing system.

 

The Greenheck GreenVent system is designed to maintain a constant pressure setpoint in an exhaust riser, which allows the exhaust airflow to closely match that of the bathroom exhaust fans. This significantly reduces unnecessary tempered air from being exhausted. The GreenVent system includes:

  • 23 centrifugal roof exhaust fans, model CUE-121-VG, with Vari-Green motor
  • 23 GreenVent constant pressure control systems (which include all necessary components for proper system operation).

A GreenVent system was installed in each of the exhaust risers to provide a demand controlled ventilation system. When bathroom fans are not on, less conditioned air is exhausted, providing additional energy and money savings. The GreenVent system monitors the pressure in the duct work and adjusts fan speed from 300 to 1,750 rpm to compensate for the number of hotel bathrooms in use. All fans are direct drive and powered by Greenheck’s high-efficiency Vari-Green motors. The motors are brushless dc (electronically commutated) high-efficiency motors that run off a 115v single-phase input that run quieter and cooler, and offer higher efficiencies with improved speed control capabilities as compared to standard motors. Vari-Green motors are capable of operating from 20% to 100% (80% turndown) of full speed versus 70% to 100% (30% turndown) for PSC motors, which are commonly used on direct drive fans. Although the GreenVent system is typically packaged as one unit, in this case, individual components were delivered to the job site as needed to meet the contractor’s work schedule.

The hotel opened in June 2009, and the system has been a tremendous success, according to Mark Jeffery, general manager of the Renaissance. “Because the fans run at a minimum speed most of the time, they operate more efficiently and are much quieter than our other systems.” The installing contractor, PH Mechanical Corp., Boston, was pleased as well, noting that the system’s clear instructions made the installation process straightforward.

Information provided by Greenheck



No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Your leaks start here: Take a disciplined approach with your hydraulic system; U.S. presence at Hannover Messe a rousing success
Hannover Messe 2016: Taking hold of the future - Partner Country status spotlights U.S. manufacturing; Honoring manufacturing excellence: The 2015 Product of the Year Winners
Inside IIoT: How technology, strategy can improve your operation; Dry media or web scrubber?; Six steps to design a PM program
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
Special report: U.S. natural gas; LNG transport technologies evolve to meet market demand; Understanding new methane regulations; Predictive maintenance for gas pipeline compressors
Warehouse winter comfort: The HTHV solution; Cooling with natural gas; Plastics industry booming
Managing automation upgrades, retrofits; Making technical, business sense; Ensuring network cyber security
Designing generator systems; Using online commissioning tools; Selective coordination best practices

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
This article collection contains several articles on strategic maintenance and understanding all the parts of your plant.
click me