Paulius
Hello,
I need to calculate a hotel pool room's air supply requirements. This is for my University work, at this time i do not have the possibility to consult anyone from there so i am asking for assistance here.
I do not require anything too sophisticated, this pool room is not very significant for me.
I tried looking for calculation methods in ASHRAE, but there calculations seem to be very precise, i don't need that. I need something simple and quick that would roughly estimate the amount of supply air required. I imagine most engineers out there have simple methods that work for them.
In response to the first reply,
I know the basics of these calculations, this is what i've been studying for the past 3,5 years, but pool room calculation is new to me.
I need to maintain negative pressure ofcourse, letting moist air escape to other parts of the building would be bad.
Answer
Edit - - Oops, I just noticed that you might be referring to a swimming pool room and not to billiards (pool) tables. Well, just hold on to the below just in case.
For a swimming pool room you can design for an exhaust sized to induce a 100- 200 ft/min velocity through the door leading into the rest of the building. ASHRAE shows outside purge ventilation of 1/2 cfm per person for swimming areas. As noted below any exhaust may need to be made up with an outdoor supply in some manner, some place. It will be by infiltration somewhere if not accommodated for by design. I do not believe pool rooms are cooled, but they may require heating, depending on the construction. With heated pools the room humidity can be high, but that improves the comfort level in the Winter. There can be condensation problems. ( I personally believe that heated pools are usually too warm.) Current ASHRAE applications guides may include criteria for pool areas. The older ones ( 1969 which I have) do not. I do know that there have been articles published in ASHRAE literature on the topic.
Now for the billiards-
The 1989 ASHRAE ventilation rates have shown for gaming rooms - 25 cfm of outside purge ventilation air per occupant. This would take random smoking into account. If no smoking, the newer codes may allow 10- 15 cfm. For heavy smoking it was 60 cfm.
A design rule of thumb could be one ton of rated refrigeration capacity per 350 sq, ft of floor area. Based on the usual ~ 20 F temperature change in the supply air compared to the room temperature there would be about 1 cfm per sq ft. Because of the nature of the occupancy I would recommend a higher rate of 1 1/2 - 2 cfm.
The fresh ventilation air might be drawn in from large adjacent areas within a building by the employment of an exhaust fan. Or the purge air will need to be brought in really from the outside and tempered to match the room conditions. This will require more cooling capability in the Summer and more heating capacity in the Winter. Unless the main air handling equipment can be arranged and sized for this additional purge ventilation air, a separate makeup air unit may be needed for a large occupancy. This could likewise be a consideration for other types of occupancy and for laboratories utilizing bench -type exhaust hoods or large kitchen hoods. ( They often overlook that the purge or exhaust air has to come from somewhere for the hoods to work properly.)
A little history - in the 1970s during the Arab Oil Crisis, the Federal Government bureaucrats devised new design energy saving criteria for buildings which drastically reduced the outside air purge ventilation rates. As a consequence, a few yeas later the "Sick Building Syndrome" appeared.
Edit - - Oops, I just noticed that you might be referring to a swimming pool room and not to billiards (pool) tables. Well, just hold on to the below just in case.
For a swimming pool room you can design for an exhaust sized to induce a 100- 200 ft/min velocity through the door leading into the rest of the building. ASHRAE shows outside purge ventilation of 1/2 cfm per person for swimming areas. As noted below any exhaust may need to be made up with an outdoor supply in some manner, some place. It will be by infiltration somewhere if not accommodated for by design. I do not believe pool rooms are cooled, but they may require heating, depending on the construction. With heated pools the room humidity can be high, but that improves the comfort level in the Winter. There can be condensation problems. ( I personally believe that heated pools are usually too warm.) Current ASHRAE applications guides may include criteria for pool areas. The older ones ( 1969 which I have) do not. I do know that there have been articles published in ASHRAE literature on the topic.
Now for the billiards-
The 1989 ASHRAE ventilation rates have shown for gaming rooms - 25 cfm of outside purge ventilation air per occupant. This would take random smoking into account. If no smoking, the newer codes may allow 10- 15 cfm. For heavy smoking it was 60 cfm.
A design rule of thumb could be one ton of rated refrigeration capacity per 350 sq, ft of floor area. Based on the usual ~ 20 F temperature change in the supply air compared to the room temperature there would be about 1 cfm per sq ft. Because of the nature of the occupancy I would recommend a higher rate of 1 1/2 - 2 cfm.
The fresh ventilation air might be drawn in from large adjacent areas within a building by the employment of an exhaust fan. Or the purge air will need to be brought in really from the outside and tempered to match the room conditions. This will require more cooling capability in the Summer and more heating capacity in the Winter. Unless the main air handling equipment can be arranged and sized for this additional purge ventilation air, a separate makeup air unit may be needed for a large occupancy. This could likewise be a consideration for other types of occupancy and for laboratories utilizing bench -type exhaust hoods or large kitchen hoods. ( They often overlook that the purge or exhaust air has to come from somewhere for the hoods to work properly.)
A little history - in the 1970s during the Arab Oil Crisis, the Federal Government bureaucrats devised new design energy saving criteria for buildings which drastically reduced the outside air purge ventilation rates. As a consequence, a few yeas later the "Sick Building Syndrome" appeared.
What are your "Survival Tips" for College?
Kaylie J
Please answer my questions and give me any advice?
1) How are the class rooms like? Are there desks like in highschool?
2) I've heard classes are huge, how do the teachers even keep track of who's in class and what our names are?!
3) How do I stay organized and keep up with everything?
4) Are most classes just teachers giving speeches and students taking notes? Or are the students more involved and doing projects together?
Answer
1) Too many varieties to describe: auditorium-style with fold-down desks, tables with chairs, individual chairs with fold-down desks, long rows of tables, lab benches, etc.
2) They will take attendance the first couple of classes and if you don't show up you're automatically dropped from the class. After that, you're on your own. The professors may or may not learn your name, depending on the size of the class. If you don't show up, they don't care. Just don't expect any sympathy if you don't do well, or have a conflict on a test date or something. The professors will give the benefit of the doubt to students who are always present and involved. Students they never see, not so much.
3. For each class you will be given a syllabus on the first day of class (or before if your professor is technology-adept) which will lay out the plan for homework assignments, papers and/or tests for the entire semester. It is rare that your class will stick exactly to the plan, of course, but you just make modifications as you go along.
4. Mostly lectures, but anything labeled "seminar" will have a lot of student participation. You might get projects assigned (group or solo), but these are done outside the classroom setting as homework. Of course, science class lectures often have laboratory classes too, in which students conduct experiments, usually in pairs.
1) Too many varieties to describe: auditorium-style with fold-down desks, tables with chairs, individual chairs with fold-down desks, long rows of tables, lab benches, etc.
2) They will take attendance the first couple of classes and if you don't show up you're automatically dropped from the class. After that, you're on your own. The professors may or may not learn your name, depending on the size of the class. If you don't show up, they don't care. Just don't expect any sympathy if you don't do well, or have a conflict on a test date or something. The professors will give the benefit of the doubt to students who are always present and involved. Students they never see, not so much.
3. For each class you will be given a syllabus on the first day of class (or before if your professor is technology-adept) which will lay out the plan for homework assignments, papers and/or tests for the entire semester. It is rare that your class will stick exactly to the plan, of course, but you just make modifications as you go along.
4. Mostly lectures, but anything labeled "seminar" will have a lot of student participation. You might get projects assigned (group or solo), but these are done outside the classroom setting as homework. Of course, science class lectures often have laboratory classes too, in which students conduct experiments, usually in pairs.
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Title Post: How to calculate pool room ventilation characteristics?
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