Originally posted by Logan005
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Originally posted by J.P.M. View Posthad a very severe exhaust noise level to meet, some ridiculous # like 60 Db(a) @1 m, w/more severe low frequency attenuation.
A ported deisel Engine is 150 Db SPL @ 1 meter which is louder than a Jet Engine @ 50 meters away. 150 db SPL is a detonation of small amount of explosives. Example a 12 gauge shotgun 1 meter behind it is 150 Db SPL. If you were to stand in front of someone 3 feet away and shoot a 12 gauge over their head, they will be death. Now imagine that sound repeated 90 times a second on a 12 cylinder diesel engine running at 1800 RPM.MSEE, PEComment
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Originally posted by littleharbor View Postin Avalon where there are privately owned residences there are very few rooftop arrays. Don't know why as we have plenty of sun here.
What do you think -- is there a good four-acre site available for a PV array near Avalon?Comment
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Originally posted by Sunking View PostI think you meant dB SPL. Regardless it is an impossible requirement in an open environment. 60 dB SPL @ 1 meter is conventional speech. It would take a building with extremely thick walls or buried deep in earth to do that.
A ported deisel Engine is 150 Db SPL @ 1 meter which is louder than a Jet Engine @ 50 meters away. 150 db SPL is a detonation of small amount of explosives. Example a 12 gauge shotgun 1 meter behind it is 150 Db SPL. If you were to stand in front of someone 3 feet away and shoot a 12 gauge over their head, they will be death. Now imagine that sound repeated 90 times a second on a 12 cylinder diesel engine running at 1800 RPM.
After ~ 25 years, I seem to remember seeing some testing that showed stack S.P.L. at ~ 60 Db(a)+/- a couple of Db and about the same along the silencer stack @various elevations and 1m distant. I believe the client was satisfied.
SPL in the absolute sense is an absolute pressure level, independent of frequency. Various weightings are used for different reasons and applications. The measurements were done w/ B & K ( Bruel & Kjaer) sound instrumentation. I think their website has more info on sound pressure level measurement.Last edited by J.P.M.; 02-05-2016, 01:33 AM.Comment
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[QUOTE=DanKegel;n302618]
Speaking of 1MW arrays, I hear the peak load on the Catalina Island grid is 5MW. Tempting to ask if there's a good place on the island, hopefully near the existing power plant, for at least a 1MW array... they've got the battery and diesel (or CNG?) generators already. it'd be neat to see if a 1MW PV array would be cost-effective.
What do you think -- is there a good four-acre site available for a PV array near Avalon?
Dan, There are but as I said If it were to come into question the land would need to be "donated" by the Wrigley family. It would be awesome to see our power being created by the sun as opposed to a group of mega sized diesel engines. Our bigger problem over here is water. 100% of our water comes from this island, none from the mainland. El Nino seems to be turning out to be a dud this year and this Island is as dry as a popcorn fart. We have two desalination plants working now but they only make a portion of our water needs and are really expensive to operate.
2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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[QUOTE=littleharbor;n302643]Originally posted by DanKegel View Post
Speaking of 1MW arrays, I hear the peak load on the Catalina Island grid is 5MW. Tempting to ask if there's a good place on the island, hopefully near the existing power plant, for at least a 1MW array... they've got the battery and diesel (or CNG?) generators already. it'd be neat to see if a 1MW PV array would be cost-effective.
What do you think -- is there a good four-acre site available for a PV array near Avalon?
Dan, There are but as I said If it were to come into question the land would need to be "donated" by the Wrigley family. It would be awesome to see our power being created by the sun as opposed to a group of mega sized diesel engines. Our bigger problem over here is water. 100% of our water comes from this island, none from the mainland. El Nino seems to be turning out to be a dud this year and this Island is as dry as a popcorn fart. We have two desalination plants working now but they only make a portion of our water needs and are really expensive to operate.Last edited by J.P.M.; 02-05-2016, 12:33 PM.Comment
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Originally posted by Sunking View PostI think you meant dB SPL. Regardless it is an impossible requirement in an open environment. 60 dB SPL @ 1 meter is conventional speech. It would take a building with extremely thick walls or buried deep in earth to do that.
A ported deisel Engine is 150 Db SPL @ 1 meter which is louder than a Jet Engine @ 50 meters away. 150 db SPL is a detonation of small amount of explosives. Example a 12 gauge shotgun 1 meter behind it is 150 Db SPL. If you were to stand in front of someone 3 feet away and shoot a 12 gauge over their head, they will be death. Now imagine that sound repeated 90 times a second on a 12 cylinder diesel engine running at 1800 RPM.
a diesel generating plant, right down town. At the side walk was a muffler, about 6' in dia at the base, and pointed
straight up some 50'. Standing by it I could hear a "pom pom pom", but it wasn't loud. It would not have interfered
with a conversation at that spot. I was impressed. Bruce RoeComment
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Originally posted by bcroe View Post
Apparently with the right muffler it can be done. Long ago I was on Long Island (NY) and happened to walk by
a diesel generating plant, right down town. At the side walk was a muffler, about 6' in dia at the base, and pointed
straight up some 50'. Standing by it I could hear a "pom pom pom", but it wasn't loud. It would not have interfered
with a conversation at that spot. I was impressed. Bruce RoeComment
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Originally posted by J.P.M. View PostAs a "you could just do this " idea, maybe operating one or both of the desal plant w/solar might be a possibility or a starter conversation.Comment
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I saw a youtube video of a guy trying to silence a small 4 cycle generator and exhaust thru the wall. He managed to completely mitigate the exhaust noise, but the actual engine noise from such small engine, the end product was useless. in excess of 100 db of noise. I also see a lot of people using some really fancy exhaust on Chingens Chinese bicycle engines. trying to quieten them down. still sounds like a chainsaw going down the road.
4X Suniva 250 watt, 8X t-105, OB Fx80, dc4812vrfComment
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