Coupled TRNSYS-CFD simulations evaluating the performance of PCM plate heat exchangers in an Airport Terminal building displacement conditioning system

This is the post-print version of the Article. The official published version can be accessed from the link below. Copyright @ 2013 Elsevier.This paper reports on the energy performance evaluation of a displacement ventilation (DV) system in an airport departure hall, with a conventional DV diffuser and a diffuser retrofitted with a phase change material storage heat exchanger (PCM-HX). A TRNSYS-CFD quasi-dynamic coupled simulation method was employed for the analysis, whereby TRNSYS® simulates the HVAC and PID control system and ANSYS FLUENT® is used to simulate the airflow inside the airport terminal space. The PCM-HX is also simulated in CFD, and is integrated into the overall model as a secondary coupled component in the TRNSYS interface. Different night charging strategies of the PCM-HX were investigated and compared with the conventional DV diffuser. The results show that: i) the displacement ventilation system is more efficient for cooling than heating a space; ii) the addition of a PCM-HX system reduces the heating energy requirements during the intermediate and summer periods for specific night charging strategies, whereas winter heating energy remains unaffected; iii) the PCM-HX reduces cooling energy requirements, and; iv) maximum energy savings of 34% are possible with the deployment of PCM-HX retrofitted DV diffuser.This work was funded by the UK Engineering and Physical Sciences Research Council (EPSRC), Grant No: EP/H004181/1

Diversity and retention in engineering

The authors describe three initiatives designed to increase the academic achievement and retention of historically underrepresented students (including females and underrepresented students of color) in engineering.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/57352/1/287_ftp.pd

OCCUPANT SATISFACTION OF INDOOR ENVIRONMENTIN LIGHT OF INTEGRATED GREEN & WELL REQUIREMENTS

Buildings are the foundations of modern cities urban planning. People spend about 80-90% of their life in buildings “indoor environment / closed places”. Most successful models in developing countries set the people’s health and wellbeing in the center of focus of their Sustainable Development Planning Process (SDPP). Building architecture and design techniques developed across the time reached to the GREEN and WELL Buildings Architecture to be the cornerstone and key element of human health, accommodating and ensuring a high quality of life and wellbeing for all people at all ages. A thorough Literature review showed a gap between the Rated (LEED Certified) buildings and the occupants\u27 satisfaction. The research aims to address a proposal for a potential improvement of occupant health and wellbeing when simultaneously implementing the indoor performance requirements “rating systems” of the Leadership in Energy and Environmental Design (LEED) and the (WELL) Building Standard. The research proposal is based on the inferential analysis of the database survey of the Center of Built Environment (CBE) reflecting the individual occupant responses and the rating systems of the LEED and WELL standards. The research concludes that integrating the features of both systems significantly helps to improve the Indoor Environmental Quality (IEQ); leading to a better occupants’ health, wellbeing, and productivity

BUILD RAPPORT 2023:11 Klimadata til fugtsimuleringer Referenceår

Dette projekt omhandler udarbejdelse af et referenceår til anvendelse ved varme- og fugtsimuleringer (hygrotermiske simuleringer). Referenceåret er udarbejdet på baggrund af historiske data for perioden 2001-20019 for Sjælsmark. Det er hensigten at referenceåret kan anvendes af projekterende og udførende til at gennemføre fugtsimuleringer og bedømme konstruktioner ud fra danske klimadata. Rapport beskrivelse: Bygningsreglementet foreskriver, at bygninger skal konstrueres og udføres så fugtskader undgås fx skimmelvækst. Bygningers konstruktioner påvirkes af fugt fra udeklimaet og indefra af bygningens brug. En måde til at dokumentere, at konstruktioner er projekteret uden risiko for fugtskader, er ved at udføre en simulering af varme- og fugtforholdene i konstruktioner. I Danmark findes der ikke et simuleringsprogram, som skal anvendes til simuleringer, men der anvendes forskellige programmer fx WUFI® Pro og DELPHIN. Disse programmer har ikke danske klimadata, og derfor anvendes nærliggende klimadata fra fx Lund, Sverige eller Bremerhaven, Tyskland. Denne rapport omhandler udarbejdelse af et referenceår til anvendelse ved varme- og fugtsimuleringer (hygrotermiske simuleringer). Referenceåret er udarbejdet på baggrund af historiske data for perioden 2001-2019 for Sjælsmark, suppleret med nedbørs data fra Holbæk flyveplads, Hillerød SØ, Store Hareskov og Gørløse for perioden 2001-2010. Rapporten er udformet så den dokumenterer grundlaget for referenceåret. Det er hensigten, at referenceåret kan anvendes af projekterende og udførende til at gennemføre fugtsimuleringer og bedømme konstruktioner ud fra danske klimadata. Rapporten er udarbejdet af post.doc Nickolaj Feldt Jensen, adjunkt Tessa Kvist Hansen og seniorforsker Martin Morelli, fra Institut for Byggeri, By og Miljø og adjunkt Anne Marie Svane og professor Rasmus Waagepetersen fra Institut for Matematiske Fag. Projektet er muliggjort med økonomisk støtte fra Aase og Ejnar Danielsens Fond. Vi takker for støtten, der har muliggjort udarbejdelse af et referenceår til fugtsimuleringer. Dette supplerende datasæt indeholder følgende: - Rådata fra DMI (2001-2019), i Excel format. - Ny dansk fugt referenceår for Sjælsmark (samt 4 stk. andre variationer af referenceåret som blev undersøgt i dette projekt). Fugt referenceår findes i WUFI (.txt), Delphin (.c6b) og Excel (.xlsx) format. - Analyser af ny dansk fugt referenceår (mod 4 stk variationer af referenceåret), i Excel format. - WUFI simuleringsmodeller (1D) - Delphin simuleringsmodeller (1D og 2D) - Simuleringsresultater (WUFI og Delphin), i Excel format. - Teoretisk risiko vurdering af skimmelsvampevækst i simulerede konstruktioner, udført med den finske VTT skimmel model. (Excel format) - Build rapport 2023:11 Klimadata til fugtsimuleringer Referenceå