Seminar 34 - Net Zero Energy Buildings PDF

Track: Fundamentals and Applications
Sponsor: Publishing and Education Council
Chair: Van Baxter, Ph.D., Fellow Life Member, ORNL, Oak Ridge, TN

Heating, cooling and ventilation of buildings is one of the dominant shares of our world's energy use. Building codes and incentive programs in many countries require reduced energy use in current and future buildings. With their high energy performance, nearly zero-energy buildings (NZEB) set new standards for building design and operation. NZEB buildings have efficient thermal envelopes resulting in low energy requirements for space heating and cooling. Their energy needs are offset by renewable energy resources. This session presents material on the subject from recently published papers from ASHRAE's archival journal, Science and Technology for the Built Environment.

1. Beyond NZEB: Experimental Investigation of the Thermal Indoor Environment and Energy Performance of a Single-Family House Designed for Plus-Energy Targets
Ongun Kazanci, Ph.D., Associate Member and Bjarne Olesen, Ph.D., Fellow ASHRAE, Danish Technical University, Lyngby, Denmark
This presentation outlines the main findings from an experimental investigation of the thermal indoor environment and energy performance of a single-family house designed for plus-energy targets. The energy use, energy production and thermal indoor environment of the house were measured for one year. Although the house was designed to be a plus-energy house, the results show that it did not perform as one. The lessons learned and suggestions for achieving plus-energy targets in future housing will be outlined in this presentation, together with the results from further parametric studies.

2. Analysis on a Net-Zero Energy Renovation of a 1920s Vintage Home
Stephen Caskey, Student Member1, Eric Bowler2 and Eckhard Groll, Dr.Ing., Fellow ASHRAE1, (1)Purdue University, West Lafayette, IN, (2)Whirlpool Corporation, Benton Harbor, MI
A 1920s vintage home was renovated with the goal of becoming net-zero energy over a 12-month period. The project was performed over two years. The first phase quantified the energy profile of the house in the original state. The second phase included a deep energy retrofit to improve the thermal insulation of the building envelope and an installation of a PV-T solar system. The annual heating demand was reduced by almost 50 percent from 38,000 kWh to 19,000 kWh. Adjustments made to the annual demand considered missing occupancy during the first phase, gaps in monitoring and the heating system used.

3. Daytime Space Cooling with Phase Change Material (PCM) Ceiling Panels Discharged Using Rooftop PV/T Panels andNight-Time Ventilation
Eleftherios Bourdakis, Student Member1, Thibault Q. Péan1, Luca Gennari1 and Bjarne Olesen, Ph.D., Fellow ASHRAE2, (1)Technical University of Denmark, Kongens Lyngby, Denmark, (2)Danish Technical University, Lyngby, Denmark
This seminar examines the possibility of using photovoltaic/thermal panels for producing cold water through the process of night-time radiative cooling. Cold water to discharged phase change material (PCM) in ceiling panels in a climatic chamber. The operative temperature remained within the range of Category III of standard DS/EN 15251 for 50% to 99% of the occupancy period. The percentage of electrical energy usage covered from the photovoltaic/thermal varied from 56% to 122%. The PCM ceiling panels were capable of providing an acceptable thermal environment and the photovoltaic/thermal panels provided most of the required electricity and cold water needed for cooling.

Presented: Tuesday, January 23, 2018, 8:00-9:30 AM
Run Time: 90 min.

This is a zip file that consists of PowerPoint slides synchronized with the audio-recording of the speaker (recorded presentation), PDF files of the slides, and audio only (mp3) for each presentation.