Effect of Air Inlet Spacing on Air Distribution and Ventilation Performance of Stratum Ventilation Using Multiple Parallel Jets
Round 1
Reviewer 1 Report
The authors present a combined experimental and computational study to understand the impact of jet spacing on several parameters related to ventilation quality. I really like the way that the authors provided experiments and CFD such that the results have a strong level of validation. I also like the way the authors presented the results in terms of parameters related to HVAC like EDTS, ADPI, LMAA and EUC. The results are easy to read and understand and are certainly immediately useful to HVAC engineers and designers. I have only a few small points to make that the authors should consider in their revisions prior to publication.
- I question the accuracy (significant digits) of some of the reported measurements. For example, on line 140 temperatures are reported to two decimal places, which is likely too much. On lines 161-162, it is reported that temperatures could only be measured to within 0.3 oC. It might be better to move the paragraph 159-171 to come before the first reported values.
- For the turbulence models considered, it is not appropriate to use the same grid density at the walls. The authors should report more specifically on how the walls were treated using the different models. Based on the grids shown, it doesn’t seem sensible that the SST k-OMEGA be used at all as very dense grids are typically required to obtain grid-independence.
Following consideration of these points, I am in favor of publication in Applied Science.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This manuscript presents an optimization study of the supply air-inlet spacing in a room with SV. Experiments and numerical simulations were performed to study the influence of the air-inlet spacing on the air distribution in the occupied zone. Six theoretical axial velocity attenuation formulae were verified using experimental results. The effective draft temperature for SV (EDTS), air diffusion performance index (ADPI), local mean age of air (LMAA), and energy utilization coefficient (EUC) were used as the evaluation indexes. The air velocity and temperature distributions were analyzed and very scientific and useful results are reported. The manuscript is well written and the quality is acceptable. In sum, in this sense, I recommend this manuscript for publishing in the current form.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
The authors presented a numerical and experimental study on the effect of Air-Inlet Spacing on Air Distribution and Ventilation Performance of Stratum Ventilation Using Multiple Parallel Jets.
Some quantitative findings are to be added to the introduction.
The novelty of the paper is to be clearly stated.
What is considered range for Reynolds number?
For the experimental study:
- More details on the data acquisition system are to be provided.
- An experimental uncertainty study is to be performed.
What is the interest of the theoretical part presented in section 2.2
For the numerical study:
- The solved governing equations are to be presented.
- Have you considered the buoyancy term in the momentum equation.
- The used turbulence model is to be justified.
- The boundary conditions are to be expressed mathematically.
- Why the boundary condition at the Window, walls, and ceiling and floor is considered at constant temperature and not as convective (natural) condition.
- It is better to present the 3D mesh.
- In addition to the velocity distribution, it will be interesting to present the flow structure (streamlines).
- Results related to the temperature field are to be presented.
- The authors considered a 3D configuration; thus, 3D flow structures and temperature fields are to be presented.
The paper is to be checked against misprints and grammatical mistakes.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 3 Report
Accept in present form
