Energy Efficient Solutions for Everyday Energy Efficiency Problems

By | 2017-11-15T15:57:47+00:00 August 22nd, 2016|Energy Efficiency, Holiday, Mechanical Engineering|

As energy efficient environmentally conscious engineers, we here at Glew Engineering do what we can to save energy and resources both around home and around the office.  This might mean choosing products that are more environmentally friendly or energy efficient.  It might mean using our surroundings to our advantage, like pulling cold air through a home or office at night so the building needs less air conditioning the next day.  The most satisfying thing, though, is to employ our knowledge of mechanical engineering, materials science and thermal management to design custom hand-tooled solutions.  In the next few blog posts, I'll [...]

Window Energy Efficiency: Solar Heat Gain and Visible Transmittance

By | 2017-11-21T12:51:26+00:00 April 4th, 2016|Mechanical Engineering, Thermal Management|

Conduction and Radiation of Thermal Energy In my last blog post, I wrote about the conduction and radiation of thermal energy through windows and the thermal transmittance value, called the U-Factor, that characterizes that heat transfer.  The U-factor is useful in evaluating window performance and making wise decisions when specifying components for a building, but it is only one piece of the puzzle.  The National Fenestration Research Council (NFRC) mandates a second value alongside U-factor in its certification process, called the Solar Heat Gain Coefficient (SHGC).  SHGC represents the ability of a window to resist [...]

Window Energy Efficiency: Thermal Transmittance

By | 2017-11-07T15:14:36+00:00 March 30th, 2016|Mechanical Engineering, Thermal Management|

Figure 1: Windows catching sunlight By Magda S [ Content License] In our last blog post, I wrote about the thermal resistance (R-value) and transmittance (U-factor) of insulation and windows.  The R-value represents how well a material prevents heat transfer through its thickness, and U-factor is its inverse, representing how much heat a material will conduct through.  These values are fairly simple to calculate for most building materials materials like the bricks and panels in Figure 1, as they primarily experience only conductive heat transfer.  Windows are a more challenging proposition, however, since the heat transfer through them [...]

Energy Efficiency in Building Materials, Insulation and Windows

By | 2017-11-07T15:05:13+00:00 March 24th, 2016|Mechanical Engineering, Thermal Management|

Figure 1: FLIR image of two houses showing energy loss. Colors towards red on the scale indicate warmer surfaces and more energy loss. The basic principle behind thermal insulation is simple to understand.  The harder it is for heat to travel through a material, the better insulator that material will make.  In this blog, I’m going to take a look at how that effectiveness is quantified, after a brief review of the three methods of heat transfer.  The building and construction industry use a ratio called the R-factor to indicate how well a building material can insulate a space.  [...]