Dr XIAOFENG ZHENG's Outputs (23)

Numerical Study on Thermal Storage-Discharge Process of Envelopes in Building Heating Systems With Different Terminals (2024)
Presentation / Conference Contribution
Xu, B., Zhang, H., Dou, Y., Zheng, X., & Yan, Y. (2024, August). Numerical Study on Thermal Storage-Discharge Process of Envelopes in Building Heating Systems With Different Terminals. Presented at ASME 2024 7th International Conference on Micro/Nanoscale Heat and Mass Transfer, Nottingham, UK

Building clusters and district heating systems have large thermal inertia, which can serve as thermal storage units and regard as important flexible resource. In this study, an integrated spatial discrete model for simulating the thermal performance... Read More about Numerical Study on Thermal Storage-Discharge Process of Envelopes in Building Heating Systems With Different Terminals.

The impact of wind upon the pulse technique measured airtightness of a detached dwelling (2022)
Journal Article
Hsu, Y. S., Zheng, X., Kraniotis, D., Gillott, M., Lee, S. K., & Wood, C. J. (2022). The impact of wind upon the pulse technique measured airtightness of a detached dwelling. Building and Environment, 215, Article 108955. https://doi.org/10.1016/j.buildenv.2022.108955

The novel Pulse technique measures the building airtightness in a dynamic approach, involving a low-pressure pressurisation process, typically in 1–10Pa. It is known that the wind effect is one of the main sources of uncertainty for airtightness test... Read More about The impact of wind upon the pulse technique measured airtightness of a detached dwelling.

The impact of thermal insulation on cooling energy consumption and optimal insulation thickness for underground tunnel (2021)
Journal Article
Wang, Y., Wang, C., Gao, S., Zheng, X., & Darkwa, J. (2021). The impact of thermal insulation on cooling energy consumption and optimal insulation thickness for underground tunnel. Sustainable Energy Technologies and Assessments, 47, Article 101495. https://doi.org/10.1016/j.seta.2021.101495

The provision of mechanical cooling in deep mines comes with a significant energy cost as a significant amount of heat transfers from surrounding rock to the airflow. Thermal insulation can be applied to reduce such heat transfer, thereby cutting dow... Read More about The impact of thermal insulation on cooling energy consumption and optimal insulation thickness for underground tunnel.

The Application of Silica-Based Aerogel Board on the Fire Resistance and Thermal Insulation Performance Enhancement of Existing External Wall System Retrofit (2021)
Journal Article
Liu, K. S., Zheng, X. F., & Lee, S. K. (2021). The Application of Silica-Based Aerogel Board on the Fire Resistance and Thermal Insulation Performance Enhancement of Existing External Wall System Retrofit. Energies, 14(15), Article 4518. https://doi.org/10.3390/en14154518

Due to the need of good thermal performance, external wall insulation (EWI) is usually made of materials that are not fire resistant and sometimes flammable. That restricts its application to a particular circumstance such as limited building height.... Read More about The Application of Silica-Based Aerogel Board on the Fire Resistance and Thermal Insulation Performance Enhancement of Existing External Wall System Retrofit.

Experimental investigation on performance improvement of thermoelectric generator based on phase change materials and heat transfer enhancement (2021)
Journal Article
Wang, Y., Peng, Y., Guo, K., Zheng, X., Darkwa, J., & Zhong, H. (2021). Experimental investigation on performance improvement of thermoelectric generator based on phase change materials and heat transfer enhancement. Energy, 229, Article 120676. https://doi.org/10.1016/j.energy.2021.120676

Thermoelectric application has been widely researched due to its various advantages. Its use has been limited to niche industrial applications and exploratory research development due to the poor economic viability. It is essential to achieve the opt... Read More about Experimental investigation on performance improvement of thermoelectric generator based on phase change materials and heat transfer enhancement.

Evaluation of the indoor pressure distribution during building airtightness tests using the pulse and blower door methods (2021)
Journal Article
Hsu, Y.-S., Zheng, X., Cooper, E., Gillott, M., & Wood, C. J. (2021). Evaluation of the indoor pressure distribution during building airtightness tests using the pulse and blower door methods. Building and Environment, 195, Article 107742. https://doi.org/10.1016/j.buildenv.2021.107742

Building airtightness is a critical aspect for energy-efficient buildings as the energy performance of a building can be significantly reduced by poor airtightness. The Pulse technique has been regarded as a promising technology, measuring building a... Read More about Evaluation of the indoor pressure distribution during building airtightness tests using the pulse and blower door methods.

Numerical and experimental validations of the theoretical basis for a nozzle based pulse technique for determining building airtightness (2020)
Journal Article
Cooper, E., Zheng, X., & Wood, C. J. (2021). Numerical and experimental validations of the theoretical basis for a nozzle based pulse technique for determining building airtightness. Building and Environment, 188, Article 107459. https://doi.org/10.1016/j.buildenv.2020.107459

Motivated by intentions of avoiding large net fluid flow and enabling a more practical airtightness test for large buildings, a low-pressure Pulse pressurisation technique was developed for measuring building airtightness at pressures that are consid... Read More about Numerical and experimental validations of the theoretical basis for a nozzle based pulse technique for determining building airtightness.

Estimation of the infiltration rate of UK homes with the divide-by-20 rule and its comparison with site measurements (2020)
Journal Article
Vega Pasos, A., Zheng, X., Smith, L., & Wood, C. (2020). Estimation of the infiltration rate of UK homes with the divide-by-20 rule and its comparison with site measurements. Building and Environment, 185, Article 107275. https://doi.org/10.1016/j.buildenv.2020.107275

Buildings are responsible for 40% of the global energy usage to which infiltration-caused heat losses are responsible for 30%. Air infiltration is the unintended flow of air through leakage paths and fundamentally determined by the airtightness of a... Read More about Estimation of the infiltration rate of UK homes with the divide-by-20 rule and its comparison with site measurements.

On the power law and quadratic forms for representing the leakage-pressure relationship- Case studies of sheltered chambers (2020)
Journal Article
Zheng, X., & Wood, C. (2020). On the power law and quadratic forms for representing the leakage-pressure relationship- Case studies of sheltered chambers. Energy and Buildings, 226, Article 110380. https://doi.org/10.1016/j.enbuild.2020.110380

The leakage characteristics of a building can be described by a leakage-pressure relationship, which sometimes is referred to as flow-pressure relationship. This relationship provides the leakage rate through the building envelope when it is subject... Read More about On the power law and quadratic forms for representing the leakage-pressure relationship- Case studies of sheltered chambers.

A practical review of alternatives to the steady pressurisation method for determining building airtightness (2020)
Journal Article
Zheng, X., Cooper, E., Gillott, M., Vega Pasos, A., & Wood, C. (2020). A practical review of alternatives to the steady pressurisation method for determining building airtightness. Renewable and Sustainable Energy Reviews, 132, Article 110049

As an important indicator of construction quality and envelope integrity of buildings, airtightness is responsible for a considerable amount of energy losses associated with infiltration. It is crucial to understand building airtightness during const... Read More about A practical review of alternatives to the steady pressurisation method for determining building airtightness.

Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity (2020)
Journal Article
Wang, Y., Jiang, J., Darkwa, J., Xu, Z., Zheng, X., & Zhou, G. (2020). Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity. Renewable Energy, 160, 803-816. https://doi.org/10.1016/j.renene.2020.06.138

A new laser irradiation fracturing method is employed to crack the Hot Dry Rock (HDR) and variations of rock temperature, specific energy (SE) and modified specific energy (MSE), thermal damages and open porosity of granite samples caused by moving l... Read More about Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity.

Airtightness measurement of an outdoor chamber using the Pulse and blower door methods under various wind and leakage scenarios (2020)
Journal Article
Zheng, X., Mazzon, J., Wallis, I., & Wood, C. J. (2020). Airtightness measurement of an outdoor chamber using the Pulse and blower door methods under various wind and leakage scenarios. Building and Environment, 179, Article 106950. https://doi.org/10.1016/j.buildenv.2020.106950

As a continued investigation following the previous testing of a house-sized chamber in a sheltered environment, this paper introduces an experimental study of airtightness measurement of an outdoor chamber using both the novel Pulse technique and th... Read More about Airtightness measurement of an outdoor chamber using the Pulse and blower door methods under various wind and leakage scenarios.

Thermo-mechanical and moisture absorption properties of fly ash-based lightweight geopolymer concrete reinforced by polypropylene fibers (2020)
Journal Article
Wang, Y., Zheng, T., Zheng, X., Liu, Y., Darkwa, J., & Zhou, G. (2020). Thermo-mechanical and moisture absorption properties of fly ash-based lightweight geopolymer concrete reinforced by polypropylene fibers. Construction and Building Materials, 251, Article 118960. https://doi.org/10.1016/j.conbuildmat.2020.118960

An experimental investigation on the thermo-mechanical and moisture absorption properties of lightweight geopolymer concrete prepared with fly ash, NaOH, sodium silicate and Polypropylene Fibers (PF) is presented in this study. The effects of dry den... Read More about Thermo-mechanical and moisture absorption properties of fly ash-based lightweight geopolymer concrete reinforced by polypropylene fibers.

Refined assessment and comparison of airtightness measurement of an indoor chamber using the blower door and Pulse methods (2019)
Presentation / Conference Contribution
ZHENG, X., Smith, L., Moring, A., & Wood, C. (2019, October). Refined assessment and comparison of airtightness measurement of an indoor chamber using the blower door and Pulse methods. Presented at 40th AIVC - 8th TightVent - 6th venticool Conference, Ghent, Belgium

Previous studies have compared the airtightness measurement of test enclosures utilising both the novel Pulse technique and the conventional blower door method. Discrepancies between results of the two test methods were observed and it was concluded... Read More about Refined assessment and comparison of airtightness measurement of an indoor chamber using the blower door and Pulse methods.

Experimental insights into the airtightness measurement of a house-sized chamber in a sheltered environment using blower door and pulse methods (2019)
Journal Article
Zheng, X., Cooper, E., Mazzon, J., Wallis, I., & Wood, C. (2019). Experimental insights into the airtightness measurement of a house-sized chamber in a sheltered environment using blower door and pulse methods. Building and Environment, 162, Article 106269. https://doi.org/10.1016/j.buildenv.2019.106269

This paper introduces a comparison study of measuring the airtightness of a house-sized test chamber using the novel pulse technique and a low range blower door method in a sheltered environment. Eight different testing plates were prepared and appli... Read More about Experimental insights into the airtightness measurement of a house-sized chamber in a sheltered environment using blower door and pulse methods.

Experimental Studies of a Pulse Pressurisation Technique for Measuring Building Airtightness (2019)
Journal Article
Zheng, X., Zu, Y., Cooper, E., Gillott, M., Tetlow, D., Riffat, S., & Wood, C. (2019). Experimental Studies of a Pulse Pressurisation Technique for Measuring Building Airtightness. Future Cities and Environment, 5(1), 1-17. https://doi.org/10.5334/fce.66

A pulse pressurisation technique is developed and utilised for determining building leakage at low pressure, based on a "quasi-steady pulse" concept. The underlying principle of the technique is to subject the building envelope to a known volume chan... Read More about Experimental Studies of a Pulse Pressurisation Technique for Measuring Building Airtightness.

An extended pressure range comparison of the blower door and novel pulse method for measuring the airtightness of two outdoor chambers with different levels of airtightness (2018)
Presentation / Conference Contribution
Wood, C., Zheng, X., Vega Pasos, A., Hsu, Y.-S., & Smith, L. (2018, September). An extended pressure range comparison of the blower door and novel pulse method for measuring the airtightness of two outdoor chambers with different levels of airtightness. Presented at 39th AIVC - 7th TightVent & 5th venticool Conference

The steady pressurisation method measures the building leakage in a range of high pressures, typically 10-60 Pa. It is implemented by creating a steady pressure difference across the building envelope and measuring the corresponding airflow exchange... Read More about An extended pressure range comparison of the blower door and novel pulse method for measuring the airtightness of two outdoor chambers with different levels of airtightness.

Experimental study of enclosure airtightness of an outdoor chamber using the pulse technique and blower door method under various leakage and wind conditions (2018)
Presentation / Conference Contribution
Zheng, X., Mazzon, J., Wallis, I., & Wood, C. J. (2018, September). Experimental study of enclosure airtightness of an outdoor chamber using the pulse technique and blower door method under various leakage and wind conditions. Presented at 39th AIVC - 7th TightVent & 5th venticool Conference

This paper introduces an experimental study of enclosure airtightness testing of an outdoor chamber using both the pulse technique and the blower door method. This investigation is a 2nd stage comparison study following the previous testing of a hous... Read More about Experimental study of enclosure airtightness of an outdoor chamber using the pulse technique and blower door method under various leakage and wind conditions.

Experimental study on the measurement of building infiltration and air leakage rate (at 4 and 50 Pa) by means of tracer gas methods, blower door and the novel pulse technique in a detached UK home (2018)
Presentation / Conference Contribution
Vega Pasos, A., Zheng, X., Sougkakis, V., Gillott, M., Meulemans, J., Samin, O., Alzetto, F., Smith, L., Jackson, S., & Wood, C. J. (2018, September). Experimental study on the measurement of building infiltration and air leakage rate (at 4 and 50 Pa) by means of tracer gas methods, blower door and the novel pulse technique in a detached UK home. Presented at 39th AIVC - 7th TightVent & 5th venticool Conference, Antibes Juan-Les-Pins, France

Air infiltration contributes to a heat loss typically representing up to one third of the heating demand of a building. The building airtightness, also quantified as air leakage, is the fundamental building property that impacts infiltration. The ste... Read More about Experimental study on the measurement of building infiltration and air leakage rate (at 4 and 50 Pa) by means of tracer gas methods, blower door and the novel pulse technique in a detached UK home.

Experimental studies of a pulse pressurisation technique for measuring building airtightness (2018)
Presentation / Conference Contribution
Zheng, X., Cooper, E., Zu, Y., Gillott, M., Tetlow, D., Riffat, S., & Wood, C. (2018, August). Experimental studies of a pulse pressurisation technique for measuring building airtightness. Presented at 17th International Conference on Sustainable Energy Technology (SET 2018), Wuhan, China

A pulse pressurisation technique is developed and utilised for determining building leakage at low pressure, based on a 'quasi-steady pulse' concept. The underlying principle of the technique is to subject the building envelope to a known volume chan... Read More about Experimental studies of a pulse pressurisation technique for measuring building airtightness.