TRNSYS

The ongoing covid-19 pandemic has drawn the attention on the importance of providing adequate fresh air to the occupants of the built environment, in particular in educational buildings. Higher ventilation rates and personal protection devices like facial masks are among the strategies and procedures to reduce the infection risk, allowing the fruition of school spaces despite the epidemic progression. Nevertheless, the problem of airborne transmission has been usually dealt with considering each environment alone and assuming steady state conditions.

Research indicates that low-energy dwellings are more sensitive to overheating than regular dwellings. In this research the ventilative cooling potential of low-energy dwellings is considered. A low-energy dwelling based on the Active House concept, “House of Tomorrow Today” (HoTT), has been investigated as representative for low-energy dwellings in general. A computational model of the house was created with the software TRNSYS (in combination with CONTAM) and this model has been calibrated with actual (intervention) measurements in the HoTT.

The drive to reduce UK Carbon Emissions directly associated with dwellings and to achieve a zero carbon home dictates that Renewable Energy Technologies will have an increasingly large role in the built environment.  Created by the Building Research Establishment (BRE), the Standard Assessment Procedure (SAP) is the UK Government’s recommended method of assessing the energy ratings of dwellings.  This paper presents an evaluation of the advantage given to SAP ratings by the domestic installation of typical Photovoltaic (PV) and Solar Domestic Hot Water (SDHW) systems in the UK.

Cities all over the world have been warming up in the summer over the years. Seoul, Korea, is also an example of how a city was transformed into an urban heat island. Green areas produce social, economical and environmental benefits in highly populated urban areas. This study is to investigate the micro-climate changes and urban-scale cooling load reduction by the recently restored Cheonggye stream, also known as Cheonggyecheon, in Seoul, Korea.

Maintaining an IAQ with fresh in school building is very important because the good IAQ can keep the student in health and improve the academic performance. Since school buildings are very dense and require a lot of fresh air, the need for ventilation has become obvious. While opening a window does provide fresh air, which is undesirable for the indoor climate and for energy efficiency under severe outdoor condition. ERV (Energy Recovery Ventilation) technology offers an optimal solution: fresh air, better climate control and energy efficiency.

The effects of roof window on ventilation flow rates and reduction of cooling loads in densely populated areas were investigated by using building simulations. In May of the intermediate season, when utilizing roof window, the cumulative number of air exchanges increased by 9 % to 12 % compared to that when the windows at side walls remained open only during the daytime. When the building coverage ratio increased from 0 % to 20 %, the cumulative number of air exchanges decreased and the cumulative cooling loads increased.

A simulation study on the reduction of cooling loads by utilizing cross-ventilation was performed for a typically shaped house as defined by the Architectural Institute of Japan. A reduction in cooling load of around 50% could be achieved when the windows were opened liberally at night compared with the cooling load when all the windows remained closed, regardless of building coverage ratio.

This work proposes a mathematical dynamic modeling of a PV-T bi-fluids collector prototype that willpermit electricity production and preheating air and/or hot water production.This study is realised in a bi-dimensional geometry according to some assumptions. The collector is discretizedalong the flow and the collector slope is taking into account in the radiative transfers equations.

This article presents the study done on an individual house located in Macon, France. From the model of a house called ‘reference house’, in conformity with French thermal regulation, different parameters concerning the walls, the screenings or the ventil

A pesar de ser España uno de las países de la UE con mayor recurso solar en base anual, la gran variación estacional en la disponibilidad de radiación solar y el periodo relativamente corto de la demanda de calefacción, dificultan alcanzar significantes p