Paper Conference

Proceedings of eSim 2014: 8th Conference of IBPSA-Canada


Graphical Method for Characterization of Space Conditioning Requirements for a House with Improved Building Envelope

Alexandra Giroux, Michael Collins, John Wright

Abstract: The current work examines the space conditioning requirements of HVAC systems for energy efficient construction and provides a visual method of comparing these loads. ESP-r simulations were used to compare the effect of energy efficiency on the heating and cooling loads of two homes located in Toronto, Ontario, examining the sensible and latent loads on the equipment. By tightening the building envelope and increasing the insulation, it was expected that a reduction in the sensible and latent loads would be seen, as well as a shift from large sensible loads to large latent loads. This shift will be illustrated using a graphical method that was developed for this purpose. Details regarding how the sensible and latent loads are affected by increased insulation and reduced infiltration will enable better characterization of the space conditioning loads and allow for humidity control strategies to be identified and implemented. It will also indicate which types and capacities of HVAC equipment are required to maintain thermal comfort with an improved envelope. Two cases were simulated. The first was a ‘reference house’ built to the specifications of the 2006 Ontario Building Code. The second was similar except that the house was upgraded to be very energy efficient, featuring increased insulation, reduced infiltration, and better windows. Preliminary results show that increasing the energy efficiency of the building envelope and decreasing the infiltration will have an appreciable effect on both the sensible and latent loads, as well as the sensible heat ratio of the equipment. These effects are shown using the graphical method developed.
Pages: 412 - 425