Zoekresultaten

Occupant response to transitions across indoor thermal environments in two different workspaces

To understand how transition across different thermal zones in a building impacts the thermal perception of occupants, the current work examines occupant feedback in two work environments — nursing staff in hospital wards and the workers in an office. Both studies used a mix of subjective surveys and objective measurements. A total of 96 responses were collected from the hospital wards while 142 were collected from the office. The thermal environment in the hospital wards was perceived as slightly warm on the ASHRAE thermal sensation scale (mean TSV = 1.2), while the office workers rated their environment on the cool side (mean TSV =  0.15). The results also show that when the transitions were across temperature differences within 2 °C, the thermal perception was not impacted by the magnitude of the temperature difference — as reflected in occupant thermal sensation and thermal comfort/thermal acceptability vote. This would imply that the effect of temperature steps on thermal perception, if any, within these boundaries, was extremely short lived. These findings go towards establishing the feasibility of heterogeneous indoor thermal environments and thermal zoning of workspaces for human comfort.

Occupancy-based lighting control in open-plan office spaces

Lighting accounts for a significant amount of electrical energy consumption in office buildings, up to 45% of the total consumed. This energy consumption can be reduced by as much as 60% through an occupant-dependent lighting control strategy. With particular focus on open-plan offices, where the application of this strategy is more challenging to apply due to differences in individual occupancy patterns, this paper covers (1) to which extent individual occupancy-based lighting control has been tested, (2) developed, and (3) evaluated. Search terms were defined with use of three categories, namely ‘occupancy patterns’, ‘lighting control strategy’, and ‘office’. Relevant articles were selected by a structured search through key online scientific databases and journals. The 24 studies identified as eligible were evaluated on six criteria: (1) study characteristics, (2) office characteristics, (3) lighting system characteristics, (4) lighting control design, (5) post-occupancy evaluation, and (6) conclusions, and this was used to answer the research questions. It was concluded that the strategy has not been tested yet with field studies in open-plan offices, but that it needs further development before it can be applied in these type of offices. Although lighting currently tends to be controlled at workspace level, many aspects of the strategy can be further developed; there is potential to further increase energy savings on lighting within open-plan office spaces. Individual occupancy-based lighting control requires further validation, focussing on the factors influencing its energy savings, on its cost effectiveness, and on its acceptability for users.

Energy matching: exploring the value of demand flexibility in educational office buildings

This research presents a case study exploring the potential for demand side flexibility at a cluster of university buildings. The study investigates the potential of a collection of various electrical devices, excluding heating and cooling systems. With increasing penetration of renewable electricity sources and the phasing out of dispatchable fossil sources, matching grid generation with grid demand will become difficult using traditional grid management methods alone. Additionally, grid congestion is a pressing problem. Demand side management in buildings may contribute to a solution to these problems. Currently demand response is, however, not yet exploited at scale. In part, this is because it is unclear how this flexibility can be translated into successful business models, or whether this is possible under the current market regime. This research gives insight into the potential value of energy demand flexibility in reducing energy costs and increasing the match between electricity demand and purchased renewable electricity. An inventory is made of on-site electrical devices that offer load flexibility and the magnitude and duration of load shifting is estimated for each group of devices. A demand response simulation model is then developed that represents the complete collection of flexible devices. This model, addresses demand response as a ‘distribute candy’ problem and finds the optimal time-of-use for shiftable electricity demand whilst respecting the flexibility constraints of the electrical devices. The value of demand flexibility at the building cluster is then assessed using this simulation model, measured electricity consumption, and data regarding the availability of purchased renewables and day-ahead spot prices. This research concludes that coordinated demand response of large variety of devices at the building cluster level can improve energy matching by 0.6-1.5% and reduce spot market energy cost by 0.4-3.2%.

The Future of Learning and the Educational Process

From the article: The higher educational environment in Europe is changing and for the Netherlands this means that the dual educational system (universities and insti-tutes for higher professional education) will disappear. However this is not the only driver of change. Many European countries face a population that is aging and in the near future many lecturers will retire. Also the current financial crisis in Europe is causing many investments in higher education to be delayed. These and other drivers mean that universities need to organize their resources (such as buildings, lecture halls, libraries, IT etc.) in a different manner. Furthermore sup-port staff and administrators within universities need to be more flexible in the way they work to cater to the needs of a new customer group. To identify the changes that are needed and any bottlenecks that can be expected, a study was conducted at the HU University of Applied Sciences in the Netherlands. Professors, managers, staff, and students were interviewed and based on the outcomes a method for a new way of working was developed and IT tools to support this were recommended. Subsequently the method and some of the tools were tested in a pilot with 22 students. One of the most impressive results has been the re-duction in the number of e-mails sent. During the pilot several means of commu-nication were used (mainly twitter and Facebook) while the use of e-mail was not allowed. For the lecturers involved this meant a reduction in e-mail from over 1000 mails to fewer than 200 while at the same time the amount of tweets and Facebook postings totaled around 350. This means a reduction of about 45% in the number of messages. Furthermore we also used e-learning to reduce the amount of time that teachers and students needed to be physically present at the university, thereby not only reducing overhead but also helping in realizing the sustainability goals of the university.

Research through design

Research through design allows creating a dialogue with the material. It uses making andreflection on action as a generator of knowledge. Our aim is to explore the opportunities and challenges of smart textiles. The Fablab is our set up, a place that allows us to combine the hackingscientific-, and design community. It stimulates collaboration and the knowledge exchange needed for the development of smart textile systems. A collaborative prototyping workshop for medical products combined two worlds. The textile world in Saxion aims at incorporating conductive materials into textile structures and functional- / 3D printing to create systems for applications such as flexible heating systems and wearable technology. We combined this with the world of Industrial Design at TU/e, focused on the design of intelligent products, systems and services by the research through design approach. The collaboration between these different disciplines accelerated the process by reducing the resistance to the new and skipped the frustration on failure. Article from the Saxion Research Centre for Design and Technology published in the book 'Smart and Interactive Textile ' (pages 112-117), for the 4th International Conference Smart Materials, Structures and Systems, Montecatini Terme, Tuscany, Italy, 10th-14th June 2012.  

The value of FM for a healthy urban environment