Properly Treat Boiler Water for Efficient, Long-Term Operation
To ensure a boiler runs properly over the course of its lifetime, treating the water that circulates within the system is mandatory. If the water is not treated properly, the boiler will begin to have problems within the first year, and its useful life will be significantly shortened. Boiler symptoms resulting from untreated water include overheating, failure to produce hot water or steam, a drop in the boiler flow rate and an overall loss of efficiency. Water treatment recommendations vary depending on the operating pressure of the boiler, the application (steam or hot water), and other parameters. Review the recommended guidelines to prevent corrosion and scaling in low pressure boilers.
Midtown Global Market
The Midtown Global Market is a thriving, indoor international public market in south Minneapolis, Minnesota that features fresh and prepared foods and a selection of arts and crafts from around the world. The Market opened in May, 2006 as part of a major renovation of the large historic Sears Department Store and Distribution Center. The Market is located on the first floor in a lower profile section of the building beneath a 15-story tower section that contains 350 condominiums and apartments. The condos, apartments and a large corporate office were also part of the renovation. The Market, itself, serves as a great starting point for entrepreneurs who want to open a business without having the expense of leasing or purchasing their own building. More than 50 individual vendors occupy The Market including approximately 19 different restaurants that serve a wide variety of ethnic and American foods. Because many of the restaurants have grilling and cooking operations, 19 separate kitchen ventilation hoods had to be installed in The Market as part of the renovation.
Supplementing Commercial HVAC Systems with HVLS Fans
As the cost of energy continues to rise, building designers and engineers are constantly looking for ways to lower their facilityʼs energy usage. Additionally, building industries are under pressure to improve the energy efficiency of building systems from federal, state and local regulations. MacroAir – the originator of the large size high volume low speed (HVLS) commercial ceiling fans – has developed a series of energy efficient HVLS fans to meet this need.
Variable Capacity Compressors and Variable Speed Fans Save Energy and Save Money
Many applications can benefit from HVAC equipment with variable capacity scroll compressors and variable speed supply fans that reduce operating costs. With the 180,000 square foot department store in Naples, Florida, Dillard’s sought the expertise of AAON in order to accomplish significant energy savings and still provide many years of unit operation in a highly corrosive coastal environment. This paper lays out the issues faced by the Dillard’s department store in Naples and how the AAON equipment with variable capacity compressors, variable speed fans, and e-coated coils was able to solve them.
ASHRAE Standards 15 and 34 – Considerations for VRV/VRF Systems
The Variable Refrigerant Volume (VRV) technology was introduced by Daikin in the early 80’s as an alternative method of cooling and heating in commercial buildings. Today over 25 million individual spaces are being served by this technology. VRV is a very energy efficient and flexible equivalent to a chiller system while it also offers superior comfort compared to traditional air handler terminal units. The ASHRAE Standard 15 is significant to HVAC manufacturers, engineers and contractors because it specifies compliant design, construction, installation and operation of refrigeration systems. The standard was originally recognized in October 1930. Over time, the scope of the standard has been expanded but the features and technology of a VRV system have not been specifically addressed.
How Using Total Installed Costs Gives You a More Complete Picture When Comparing HVAC Systems
Why Are Total Installed Costs Important? When specifying and designing a commercial HVAC system, equipment is often considered the most important cost factor. And costs certainly vary from technology to technology. While some manufacturers present chillers or VAV as the lowest-cost option, there are often hidden factors that can be very expensive in the end. A truly comprehensive comparison of upfront HVAC costs includes more than equipment. It is important to keep in mind potential hidden costs, such as consulting/engineering design costs, installation tooling, rigging and labor, potential electrical and/or structural modifications in a building, complexity of connecting outdoor and indoor equipment, and controls integration. For example, chillers, VAV and even Ground-Source Heat Pump options seem affordable based on equipment costs alone. Yet, their weight, number of required air-handlers, water and/or ductwork piping, secondary water-tower or boiler equipment, water loop or ground-loop considerations, plus power upsizing and rigging/labor costs, can significantly increase bottom-line costs to the customer. Conversely, Mitsubishi Electric’s 2-pipe Variable Refrigerant Flow (VRF) systems are unlikely to need rigging, are easier to install, require fewer connections, often result in lower electrical loads, and eliminate the building tear-down/build-up encountered in traditional options, thus saving the customer upfront and delivering higher efficiency and ease-of-maintenance for years to come. Although every project is different, many cost considerations are the same each time. We invite you to explore the information on the following pages to learn about all the relevant factors when comparing HVAC systems. Then give us a call so we can show you how to apply these factors in the design you are working on, the specification you are writing, or the job you are bidding.
The ASHRAE HQ Building – Can the energy efficiency of the different mechanical systems really be compared?
The renovation of the ASHRAE Headquarters building in Atlanta, GA was completed in 2008. It has been awarded a LEED Platinum Certification under the LEED New Construction 2.2 rating system design for the renovated building and also ENERGY STAR® from the U.S. Environmental Protection Agency. In addition to serving as an office building for ASHRAE staff, the building is designed to provide a learning center to advance education, create a living lab for access by members and to showcase alternate technologies. The building has extensive sensing and monitoring capabilities, mainly focusing on how the systems operate, energy usage, and the environment for the occupants in the building.