Influence of the Widespread Use of Corten Plate on the Acoustics of the European Solidarity Centre Building in Gdańsk

Comments of the reviewer

Author's  response

(see corrections marked in red in the manuscript)

In abstract, this paper describes two rooms Winter garden and Multi-purpose hall,  but if you read the abstract just refers one room.

The correction is made in the abstract.

the use of the abbreviation ECS , which must be defined.

The correction is made in the abstract.

In introducing, it would be interesting to introduce some similar examples of buildings for the same purpose.

The examples of buildings are described in the new point "2. Examples of widespread use of corten cladding in public utility buildings" .

In line 110-111,i is necessary to introduce a reference “3-year period of natural stabilization of the physical and chemical properties of the corrosion coating”.

The reference on the stabilization of the corten properties is added.

In line 126. Introduce a reference about “ This lead to significant … dispersion”.

The comment is added.

Line 140, introduce characteristics or reasons why vegetation has a positive effect and reference.

The comment and the reference on the influence of vegetation is added.

In winter garden,  the study of reverberation in low frequency  250Hz, 500 Hz and 1000Hz  exceeds the recommended value , Any recommendation to reduce this time? any action to reduce it

The comment on the hall's acoustics without public  is added.

The audience's influence on the reverberation time is calculated, the results are marked in Fig. 8 and 12. The details of calculations are shown in the Appendix.

In figure 5, empty room?? What does it mean?? Like figure 4 or maybe the study was carried out during construction

In figure 9 same question, empty room like figure 7 or figure 8.

Line 183-194,  address the estimation of flutter echo but which value of K has been used or is considered the most appropriate

Notes on the interpretation of K are added.

Title of 3.3  must be changed , por example Acoustic test in Multi-purpose hall.

The title is corrected.

Line 272 , personal feelings should be avoided

The author, and at the same time the main designer of the ECS, allows himself to retain the right to express personal feelings about this place, as they became the inspiration for design decisions regarding the ECS.

Comments of the reviewer

Author's  response

(see corrections marked in red in the manuscript)

1.  A more accurate description of the state of the art with more references is necessary;

New point "2. Examples of widespread use of corten cladding in public utility buildings" is added.

2.  A more accurate description of the measurement set up must be inserted;

The comment and reference to the EN ISO 3382-2 standard is added.

3.  A comparison between the corten steel and other similar material is necessary also taking into account comparable architectural examples.

A comparison between the acoustical properties of corten steel and plaster is given in Point 4.  Comparable architectural examples are discussed in Point 2.  

Comments of the reviewer

Author's  response

(see corrections marked in red in the manuscript)

The references to non-English literature clearly complicate the understanding. Here, a short summary of these contents and further clarifying literature references would be absolutely necessary.

The questioned references are removed.

There is no information whether the reverberation times were measured according to the usual standard.

The comment and reference to the EN ISO 3382-2 standard is added.

3.3 Acoustic tests: Only the results are presented here. The methodology of the tests, the procedures for statistical evaluation, etc. are missing. It can be assumed that these are only simple listening tests. This would be o.k. in itself, but even then a better description of the challenges would be desirable - preferably also connected with acoustic measurements.

The methodology of measuring the presence of echo flutter echo  in the sound decay phenomenon and arguments for performing listening  tests are described.

Figure 9. Apart from the hint whether it was measured according to the standard, the calculation for the state occupied by the audience is missing here.

The reasons for measuring the reverberation time in a hall without an audience are given. The audience's influence on the reverberation time is calculated, the results are marked in Fig. 8 and 12. The details of calculations are shown in the Appendix.

Comments of the reviewer

Author's  response

(after changing the line numbering, the places for corrections are also shown in the "Track changes" function in Microsoft Word)

1- Some mistakes with garden in line 10 and line 161.  WARDEN--> GARDEN.

Typing errors have  been corrected.

2 - In figure 3, is entirely covered with-->  it is possible that you are referring to both facades.  If I am right, they should be changed.   "They are entirely covered...

The caption for Figure 3 has been corrected, the term "completely covered" has been removed.

3- In line 142, acoustic neutrality what does it mean??

The last sentence of point 1:

The phrase "acoustic neutrality" has been replaced by "acoustic comfort" with commentary and reference to the literature.

4- Line 168 (α_w≈0,05). Please give a reference.

Second sentence of point 4:

References are given to the symbol α_w and the value 0,05.

5 – this leads to small dispersion and a long reverberation time. Please give any reference

Third sentence of point 4:

The phrase "small dispersion" has been removed, reference is made to the long reverberation time.

6- Lines 188-190 . “Occurring in sufficiently large groups, the vegetation has a positive effect on the acoustics of the room formed in this way by absorbing and dispersing sound. “

Please give any reference where this shows.  Or the reference is [14]

In point 4.1, a new paragraph has been added regarding the sound absorption coefficient of vegetation and the expected impact of greenery on the acoustics of the winter garden, with references to the literature.

7- Appendix

Please  use the same digit  number  after the decimal point. There are some number with 1, other with 2, other with no decimal.

Appendix

Individual values are given with a different number of decimal places, as they relate to different parameters. The sound absorption coefficient α is given with 2 decimal points (the accuracy 1%), the increment of the equivalent absorption area is given with 1 decimal point, the absorption area of the whole room has been rounded to integer values.

Comments of the reviewer

Author's  response

Now the article is well written. Any changes are necessary.

The authors thank the reviewer for the positive assessment of the article.

Comments of the reviewer

Author's  response

(after the line renumbering, the places for corrections are also shown in the "Track changes" function in Microsoft Word)

10,  161
winter warden > winter garden

Typing errors have been corrected

142
It is not clear what is meant by "acoustic neutrality" as it is not a common term in room acoustics. Either it has to be explained what is really meant, or else the term has to be replaced. It can be assumed that what is meant is: The acoustic conditions would then not meet the requirements of the use.

The last sentence of Point 1:

The phrase "acoustic neutrality" has been replaced by "acoustic comfort" with commentary and reference to the literature.

168
Please give a reference to α_w: ISO 11654

Second sentence of point 4:

References are given to the symbol α_w and the value 0,05.

169
small sound dispersion > almost no sound scattering

Third sentence of point 4:

The phrase "small dispersion" has been removed, reference is made to the long reverberation time.

189
"vegetation has a positive effect on the acoustics of the room formed in this way by absorbing and dispersing sound."
Please provide a reference that shows how great the sound absorption coefficient of plants is. It would also be desirable to provide an estimate with a rough calculation showing how large the effect finally is. It can be estimated that the effect is rather small. It should therefore be transparently pointed out here that the effect is rather small.

In point 4.1, a new paragraph has been added regarding the sound absorption coefficient of vegetation and the expected impact of greenery on the acoustics of the winter garden, with references to the literature.

Appendix

It is unreasonable to give the Equivalent Absorption Area A to one digit after the decimal point. An accuracy of 0.1 m2 is suggested, which is nonsense

Appendix

Equivalent absorption area A of the room  has been rounded to integer values.