A study of passive ventilation integrated with heat recovery

O’Connor, Dominic; Calautit, John Kaiser; Hughes, Ben Richard

doi:10.1016/j.enbuild.2014.05.050

Cited by 47 publications

(23 citation statements)

References 40 publications

(42 reference statements)

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“…This was equally true for those interested in commercial wind towers [5]. The speed at which modifications can be introduced and tested in design through the use of CFD far outstrips the practicality of experimental testing though it should be noted that both methods of analysis complement each other for complete validation of a design [6].…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation and Optimisation of a Low Energy Ventilation and Cooling System

et al. 2015

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Mechanical Heating Ventilation and Air-Conditioning (HVAC) systems account for 60% of the total energy consumption of buildings. As a sector, buildings contributes about 40% of the total global energy demand. By using passive technology coupled with natural ventilation from wind towers, significant amounts of energy can be saved, reducing the emissions of greenhouse gases. In this study, the development of Computational Fluid Dynamics (CFD) analysis in aiding the development of wind towers was explored. Initial concepts of simple wind tower mechanics to detailed design of wind towers which integrate modifications specifically to improve the efficiency of wind towers were detailed. From this, using CFD analysis, heat transfer devices were integrated into a wind tower to provide cooling for incoming air, thus negating the reliance on mechanical HVAC systems. A commercial CFD code Fluent was used in this study to simulate the airflow inside the wind tower model with the heat transfer devices. Scaled wind tunnel testing was used to validate the computational model. The airflow supply velocity was measured and compared with the numerical results and good correlation was observed. Additionally, the spacing between the heat transfer devices was varied to optimise the performance. The technology presented here is subject to a patent application (PCT/GB2014/052263).

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Section: Introductionmentioning

confidence: 99%

CFD Simulation and Optimisation of a Low Energy Ventilation and Cooling System

et al. 2015

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“…Capturing heat from exhaust air and transferring it to the incoming air would raise the temperature. This concept would reduce the energy required for heating whilst providing clean air, various designs have been attempted and explored by a number of research teams with different heat recovery devices [34,35]. As cooling of the incoming air is required in hot climates, the installation of devices and techniques to reduce the incoming air temperature have been attempted.…”

Section: Previous Related Workmentioning

confidence: 99%

A novel design of a desiccant rotary wheel for passive ventilation applications

2016

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Rotary desiccant wheels are used to regulate the relative humidity of airstreams. These are commonly integrated into Heating, Ventilation and Air-Conditioning units to reduce the relative humidity of incoming ventilation air. To maximise the surface area, desiccant materials are arranged in a honeycomb matrix structure which results in a high pressure drop across the device requiring fans and blowers to provide adequate ventilation. This restricts the use of rotary desiccant wheels to mechanical ventilation systems. Passive ventilation systems are able to deliver adequate ventilation air but cannot control the humidity of the incoming air. To overcome this, the traditional honeycomb matrix structure of rotary desiccant wheels was redesigned to maintain a pressure drop value below 2Pa, which is required for passive ventilation purposes. In addition to this, the temperature of the regeneration air for desorption was lowered. Radial blades extending out from the centre of a wheel to the circumference were coated in silica gel particles to form a rotary desiccant wheel. Computational Fluid Dynamics (CFD) modelling of the design was validated using experimental data. Reduction in relative humidity up to 55% was seen from the system whilst maintaining a low pressure drop across the new design. As an outcome of the work presented in this paper, a UK patent GB1506768.9 has been accepted.

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“…Figure 1 illustrates different forms of traditional wind catcher systems in Iran. Modern wind catchers have been available in the UK for the last forty years; recent rising energy costs have seen their implementation into new and existing buildings increase [6].…”

Section: Introductionmentioning

confidence: 99%

A passive cooling wind catcher with heat pipe technology: CFD, wind tunnel and field-test analysis

Calautit

Hughes

2016

Applied Energy

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Wind catchers are natural ventilation systems based on the design of traditional architecture, intended to provide ventilation by manipulating pressure differentials around buildings induced by wind movement and temperature difference. Though the movement of air caused by the wind catcher will lead to a cooling sensation for occupants, the high air temperature in hot regions will result in little cooling to occupants. In order to maximise the properties of cooling by wind catchers, heat pipes were incorporated into the design. Computational Fluid Dynamics (CFD) was used to investigate the effect of the cooling devices on the performance of the wind catcher, highlighting the capabilities of the system to deliver the required fresh air rates and cool the ventilated space. Qualitative and quantitative wind tunnel measurements of the airflow through the wind catcher were compared with the CFD data and good correlation was observed.Preliminary field testing of the wind catcher was carried out to evaluate its thermal performance under real operating conditions. A cooling potential of up to 12 ˚C of supply air temperature was identified in this study.

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A study of passive ventilation integrated with heat recovery

Cited by 47 publications

References 40 publications

CFD Simulation and Optimisation of a Low Energy Ventilation and Cooling System

CFD Simulation and Optimisation of a Low Energy Ventilation and Cooling System

A novel design of a desiccant rotary wheel for passive ventilation applications

A passive cooling wind catcher with heat pipe technology: CFD, wind tunnel and field-test analysis

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