Swamp cooler question
in [Design]
|
From: Artemus on 15 Jul 2010 19:27 "Artemus" <bogus(a)invalid.org> wrote in message news:i1o34d$hct$1(a)news.eternal-september.org... > > > Right now the humidity is 25%, temperature is around 100F. At night we > > sometimes have high humidity rolling in from the coast. It's 100 miles > > away but one never knows on which days this delta breeze will roll in. > > > > I have a chart somewhere showing the temp differential a swamp box > can deliver depending on the outside air temp & humidity but I can't find > it right now. When I find it I'll post it. > View in fixed font Outside air temp in left column Relative Humidity 2% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 75 -21 -20 -18 -17 -16 -14 -13 -12 -11 -10 -9 80 -23 -22 -20 -18 -17 -16 -14 -13 -12 -11 -9 85 -24 -23 -22 -20 -18 -17 -15 -14 -13 -12 -11 90 -26 -25 -23 -21 -20 -18 -16 -14 -13 -12 -11 95 -28 -27 -25 -23 -19 -17 -16 -16 -14 -13 -11 100 -31 -29 -27 -24 -21 -20 -18 -17 -15 -13 -12 105 -33 -31 -28 -26 -24 -21 -19 -17 -16 110 -35 -33 -30 -27 -25 -23 -20 -18 115 -37 -35 -32 -29 -26 -24 -21 120 -39 -37 -34 -30 -27 -25 At 100 degress and 30% you can expect the cooler to deliver 82 degree air into the house. The humidity of that air is going to be much higher than 30%. Art
From: Joerg on 15 Jul 2010 19:57 Artemus wrote: > "Artemus" <bogus(a)invalid.org> wrote in message > news:i1o34d$hct$1(a)news.eternal-september.org... > > >>> Right now the humidity is 25%, temperature is around 100F. At night we >>> sometimes have high humidity rolling in from the coast. It's 100 miles >>> away but one never knows on which days this delta breeze will roll in. >>> >> I have a chart somewhere showing the temp differential a swamp box >> can deliver depending on the outside air temp & humidity but I can't find >> it right now. When I find it I'll post it. >> > > View in fixed font > Outside air temp in left column > Relative Humidity > 2% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% > 75 -21 -20 -18 -17 -16 -14 -13 -12 -11 -10 -9 > 80 -23 -22 -20 -18 -17 -16 -14 -13 -12 -11 -9 > 85 -24 -23 -22 -20 -18 -17 -15 -14 -13 -12 -11 > 90 -26 -25 -23 -21 -20 -18 -16 -14 -13 -12 -11 > 95 -28 -27 -25 -23 -19 -17 -16 -16 -14 -13 -11 > 100 -31 -29 -27 -24 -21 -20 -18 -17 -15 -13 -12 > 105 -33 -31 -28 -26 -24 -21 -19 -17 -16 > 110 -35 -33 -30 -27 -25 -23 -20 -18 > 115 -37 -35 -32 -29 -26 -24 -21 > 120 -39 -37 -34 -30 -27 -25 > > At 100 degress and 30% you can expect the cooler to deliver 82 degree > air into the house. The humidity of that air is going to be much higher than > 30%. > Thanks, Art! I have no good data for the average humidity out here but Sacramento about 35mi west in the valley is supposedly 30% average in summer. We are about 100ft high so (hopefully) less humidity. Even if we'd only get it to 82F that's better than 85F using a 7kW A/C. As for the pads, we tend to buy stuff like that off season and store it. Just like we buy our firewood in March or April. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 15 Jul 2010 20:56 On Thu, 15 Jul 2010 16:57:11 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Artemus wrote: >> "Artemus" <bogus(a)invalid.org> wrote in message >> news:i1o34d$hct$1(a)news.eternal-september.org... >> > >>>> Right now the humidity is 25%, temperature is around 100F. At night we >>>> sometimes have high humidity rolling in from the coast. It's 100 miles >>>> away but one never knows on which days this delta breeze will roll in. >>>> >>> I have a chart somewhere showing the temp differential a swamp box >>> can deliver depending on the outside air temp & humidity but I can't find >>> it right now. When I find it I'll post it. >>> >> >> View in fixed font >> Outside air temp in left column >> Relative Humidity >> 2% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% >> 75 -21 -20 -18 -17 -16 -14 -13 -12 -11 -10 -9 >> 80 -23 -22 -20 -18 -17 -16 -14 -13 -12 -11 -9 >> 85 -24 -23 -22 -20 -18 -17 -15 -14 -13 -12 -11 >> 90 -26 -25 -23 -21 -20 -18 -16 -14 -13 -12 -11 >> 95 -28 -27 -25 -23 -19 -17 -16 -16 -14 -13 -11 >> 100 -31 -29 -27 -24 -21 -20 -18 -17 -15 -13 -12 >> 105 -33 -31 -28 -26 -24 -21 -19 -17 -16 >> 110 -35 -33 -30 -27 -25 -23 -20 -18 >> 115 -37 -35 -32 -29 -26 -24 -21 >> 120 -39 -37 -34 -30 -27 -25 >> >> At 100 degress and 30% you can expect the cooler to deliver 82 degree >> air into the house. The humidity of that air is going to be much higher than >> 30%. >> > >Thanks, Art! I have no good data for the average humidity out here but >Sacramento about 35mi west in the valley is supposedly 30% average in >summer. We are about 100ft high so (hopefully) less humidity. > >Even if we'd only get it to 82F that's better than 85F using a 7kW A/C. Huh? 82�F at very high humidity is horrible. At your place how much electricity do you use to get 85�F air-conditioned. > >As for the pads, we tend to buy stuff like that off season and store it. >Just like we buy our firewood in March or April. IF you can find Aspen pads off-season. They're cheap BTW. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Since New Yorkers think it appropriate to boycott Arizona over stopping illegal immigration and drug trafficking, I suggest that everyone else support building the Muslim Monument at Ground Zero
From: Joerg on 15 Jul 2010 21:08 Jim Thompson wrote: > On Thu, 15 Jul 2010 16:57:11 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> Artemus wrote: >>> "Artemus" <bogus(a)invalid.org> wrote in message >>> news:i1o34d$hct$1(a)news.eternal-september.org... >>> > >>>>> Right now the humidity is 25%, temperature is around 100F. At night we >>>>> sometimes have high humidity rolling in from the coast. It's 100 miles >>>>> away but one never knows on which days this delta breeze will roll in. >>>>> >>>> I have a chart somewhere showing the temp differential a swamp box >>>> can deliver depending on the outside air temp & humidity but I can't find >>>> it right now. When I find it I'll post it. >>>> >>> View in fixed font >>> Outside air temp in left column >>> Relative Humidity >>> 2% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% >>> 75 -21 -20 -18 -17 -16 -14 -13 -12 -11 -10 -9 >>> 80 -23 -22 -20 -18 -17 -16 -14 -13 -12 -11 -9 >>> 85 -24 -23 -22 -20 -18 -17 -15 -14 -13 -12 -11 >>> 90 -26 -25 -23 -21 -20 -18 -16 -14 -13 -12 -11 >>> 95 -28 -27 -25 -23 -19 -17 -16 -16 -14 -13 -11 >>> 100 -31 -29 -27 -24 -21 -20 -18 -17 -15 -13 -12 >>> 105 -33 -31 -28 -26 -24 -21 -19 -17 -16 >>> 110 -35 -33 -30 -27 -25 -23 -20 -18 >>> 115 -37 -35 -32 -29 -26 -24 -21 >>> 120 -39 -37 -34 -30 -27 -25 >>> >>> At 100 degress and 30% you can expect the cooler to deliver 82 degree >>> air into the house. The humidity of that air is going to be much higher than >>> 30%. >>> >> Thanks, Art! I have no good data for the average humidity out here but >> Sacramento about 35mi west in the valley is supposedly 30% average in >> summer. We are about 100ft high so (hopefully) less humidity. >> >> Even if we'd only get it to 82F that's better than 85F using a 7kW A/C. > > Huh? 82�F at very high humidity is horrible. > I know, that's why I am not totally sold yet on swamp coolers. But the propane company technician who was here this morning said his swamp cooler works great. > At your place how much electricity do you use to get 85�F > air-conditioned. > There are only 6-8 days a month where we have to do that, mostly because old Rottie needs it. When it's 100F outside this unit will eat 7kW and run somewhat above 50% duty cycle. Since most such days aren't followed by a delta breeze and it doesn't cool off at night you'd be looking at well north of 50kWh/day (duty cycle goes down in the evenings). >> As for the pads, we tend to buy stuff like that off season and store it. >> Just like we buy our firewood in March or April. > > IF you can find Aspen pads off-season. They're cheap BTW. > Yeah, I am not worried about those. I am more concerned about things like the large slots and holes and no screen on those machines. Perfect invitation for critters to come in. It looks like at least up to the size of mice could fit through. And out here, when they fit they'll come. Somehow the designs look dated and incomplete. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Mark on 15 Jul 2010 22:32 Someone mentioned adding a BLEED kit... I agree. It is a VERY good thing to do Think about it,,, without a bleed kit, water + minerals go in and water is evaporated, leaving ALL the minerals in the pads. With a bleed kit, say 10% of the incoming water exits via the bleed, so the minerals come to an equilibrium. I used a small hose and would use the bleed water to water the greens... Mark
First
|
Prev
|
Next
|
Last
Pages: 1 2 3 4 Prev: JOB: Client Needs QA Test Lead (Ft.Worth, TX) Next: H bridge Rectifier |