Abdullahi Ahmed

Simulated Performance of Earthtube for Cooling of Office Buildings in the Southeast of UK

Using the ground-air heat exchanger to reduce the temperature fluctuations of the outdoor air supply to a building is a potential sustainable low carbon emissions building design option where suitable site conditions exist. Although the basic concept of this technology is simple and some thermal models already exist, there is no integrated design tool or published data that can be used directly to predict their dynamic thermal performance. This research reviewed the current state of the art on the thermal models of earthtubes and thermal performance prediction tools. Available soil temperature profiles and earthtube thermal models were evaluated, selected and adopted in component based dynamic thermal simulation software Transient System Simulation Environment (TRNSYS). A system network representing the configuration of a proposed system can be establish which enables parametric and system study of the dynamic thermal behaviour. This computer simulation tool was applied to study the application of earthtube to maintain the summer thermal comfort of an office located at the southeast of UK. The results showed an optimized system configuration with the appropriate pipe diameter, pipe length and airflow rates are necessary to maintain the comfort conditions in the summer.

Non-Invasive Approaches for Low-Energy Retrofit of Buildings: Implementation, Monitoring and Simulation in a Living Lab Case Study

There is urgent need for Europe to transform into a low-carbon economy to reduce the risk of climate change. The building sector is responsible for nearly 40% of the total energy consumption in Europe. In order to achieve substantial energy and greenhouse gas (GHG) emission reductions, low-energy retrofitting of existing buildings becomes a very important challenge/opportunity in both domestic and non-domestic buildings. A considerable number of existing buildings are either protected or contain hazardous materials limiting the potential for conventional retrofitting approaches for improving the existing facades. Retrofitting Solutions and Services for the enhancement of Energy Efficiency in Public Buildings (RESSEEPE) is an EU-funded research project that focuses on the refurbishment of existing public buildings in different European cities. A case study approach is used to implement and monitor the performance of a range of building fabric materials. The case study focuses on a demo building in Coventry University, located within the city centre of Coventry. The paper documents the materials selection and the low-carbon refurbishment, monitoring and simulation process followed. As asbestos was found in the building, it was necessary to ensure that the materials and technologies selected didn’t interfere with the existing elements of the facade. The materials finally installed were specifically selected to work as an addition of layers rather than substitution of elements. The living lab nature of the demo-site aims to set an example for low carbon refurbishment in protected or existing buildings with hazardous materials, with a non-invasive approach based on state-of-the-art materials and technologies.