Over the past 25 years, ASHRAE has dramatically increased the minimum efficiency requirements for commercial buildings and their associated equipment. The direct result:
• 44% improvement in lighting efficiency
• 27% improvement in cooling efficiency
• 21% improvement in building envelope efficiency
• 37% improvement in commercial building efficiency overall
• But only 1% improvement in heating efficiency
In many commercial and industrial buildings, unit heaters are the popular choice for space heating. But, according to ASHRAE, these buildings require ventilation systems in addition to space heating in order to meet code. With separate systems providing space heating and outside air, most buildings have complex heating systems that consume too much energy.
Wanting to find out for themselves the viability of the HTHV technology, the DOE conducted their own independent study.
They discovered that direct-fired HTHV demonstrated 20% gas savings compared to standard unit heaters, a margin that could substantially reduce energy consumption and utility bills for commercial and industrial buildings in the U.S.
Direct-fired technologies have been widely adopted as high-efficiency ventilation units. The DOE’s study has proved HTHV’s viability in increasing heating efficiency in the United States, an area that not seen much improvement in the past 25 years.
Here is a short 2 minute and 30 second video about 3 available options on Cambridge Engineering’s Make Up Air Units. Watch the video to learn about our Modulating Gas Controls, Variable Frequency Drives and Automated Profile Damper controls.
Watch this great video about a recent trip our leadership team took to Xylem Design in Fort Collins, CO for a Global Lean Leadersship Summit. Learn how Xylem eliminates waste and romoves that which they struggle with in they daily activities.
Let us know what you think about these Lean efforts.
According to the Environmental Protection Agency the average American spends 93% of their life indoors…. 87% is spent indoors at their work and home and the other 6% is spent in their automobiles. With that much time spent inside we should all be more concerned with Indoor Air Quality.
Recently Cambridge Engineering’s Doug Eisenhart published a post about IAQ that focused on the effects of temperature and productivity of a workforce because ambient air temperature is an IAQ factor. Doug was spot on with his comments about productivity and its correlation to temperature.
Along with temperature the quality of the air from indoor pollutants is also an important IAQ factor that needs our attention. Pollutants such as volatile organic compounds (VOC), particulates and carbon dioxide, to name a few, can not only affect short term productivity but can also have long lasting negative health consequences to those working in that environment.
One way to alleviate these types of IAQ problems is to have the building properly ventilated through the use of mechanical ventilation of filtered outside air. By using High Temperature Heating and Ventilation (HTHV) products that use 100% outside you have the ability to not only heat the space but also ventilate the space in an effort to help reduce the types of indoor air pollutants that can sometimes cause serious health problems. HTHV products, when combined with appropriate air filters offer a very energy efficient way to heat and ventilate a structure during the winter months when bringing in outside air is the most problematic.
There is plenty of information available that can provide guidance on indoor air quality and ventilation. Here are two that I have found useful:
2. ASHRAE publication titled – Indoor Air Quality Guide: Best Practices for Design, Construction and Commissioning is a free publication located on the ASHRAE website at https://www.ashrae.org/resources–publications/bookstore/indoor-air-quality-guide. The guide is designed for architects, design engineers, contractors, commissioning agents, and all other professionals concerned with indoor air quality.
ASHRAE also has available for purchase their ANSI/ASHRAE Standard 62.1-2016 Ventilation for Acceptable Indoor Air Quality. Standard 62.1 specifies minimum ventilation rates for new and existing buildings that are intended to provide indoor air quality that is acceptable to human occupants and that minimizes adverse health effects. This publication is located on the ASHRAE website at https://www.ashrae.org/resources–publications/bookstore/standards-62-1–62-2.
Let us know what you think about the IAQ subject and look for more post on Indoor Air Quality in the future.
Lately I’ve been reading a lot about, and practicing, lean principles especially since our organization has started using the principles outlined in a book called the 2-Second Lean by Paul Akers. Although this is not the start of Cambridge’s lean journey, it has been a significant simplification to the process and has made a huge impact. It talks about how to recognize and eliminate waste in an effort to provide more value for our customers. The book talks specifically about 8 deadly wastes; over production, transportation, inventory, defects, over processing, motion, waiting, and unused employee genius.
What is a net-zero building? Basically it is a building that creates as much renewable energy as compared to the Delivered Energy it uses. By this I mean the amount of electricity and natural gas that is provided by local utilities or the Delivered Energy that is tracked by some type of meter and that you don’t physically create yourself. This Delivered Energy is compared to the renewable energy that you do create onsite (solar, wind, hydro, etc.) and the net difference is equal to or less than zero.