Another Deployable Doubt Dispeller
Without evidence, quite frankly your opinion is worthless.
"Solar Flare" wrote in message ...
It has been tried and it never works.
"SJC" wrote in message
news:TJ2dh.2065$lb1.1849@trnddc05...
"Cosmopolite" wrote in message
news:9A2dh.29751$dX4.28149@clgrps13...
Nick Pine wrote:
People still doubt that houses can be close to 100% solar heated
outside of
the Southwest, inexpensively. Here's another 8' D-cube that might
be deployed
to regional Infestations of Doubt, with 2" double-foil
polyisocyanurate walls
and ceiling and an 8'x8' layer of Thermaglas Plus twinwall
polycarbonate over
the south wall and 0.44 inches of water under the ceiling and
6.86" of water
in a 6'x6' EPDM-rubber-lined cloudy day heat storage tank under
the floor. On an average day, thermosyphoning sunspace air would
heat the ceiling mass
to about 160 F, and it would cool to about 80 by dawn. A room temp
thermostat
with a 2-watt damper motor would rotate foil foamboard louvers
below the mass
to keep the room 70 F by radiation. On a cloudy day, a low-power
pump would
move hot water up from the floor tank through the ceiling. 20
TA=30'outdoor temp (F)
30 TI=70'indoor temp (F)
40 SS=1000'south sun (Btu/ft^2-day)
50 TAU=.8'south glazing solar transmission
60 UVG=.58'south glazing U-value
70 SUN=64*TAU*SS'sun in (Btu/day)
80 RVW=15.5'wall R-value
90 RVS=RVW+1/UVG'south wall R-value
100 HC=(TI-TA)*64*(1/RVS+3/RVW)'required ceiling heat (Btu/h)
110 GC=4*1.714E-09*(TI+5+460)^3'min ceiling rad conductance
(Btu/h-F-ft^2)
120 TMIN=TI+HC/GC/64'min ceiling temp (F)
130 SWNL=18*(TI-TA)*64/RVS'south wall night loss (Btu)
140 OWL=24*(TI-TA)*3*64/RVW'other wall loss (Btu/day)
150 RC=15.5'ceiling R-value
160 NETSUN=SUN-SWNL-OWL+6*TA*64*UVG-(TMIN/2-TA)*64/RC'net sun
(Btu/day)
170 TS=NETSUN/(6*64*UVG+12*64/RC)'sunspace day temp (F)
180 TC=(TS+TMIN)/2'est. average ceiling temp (F)
190 ONH=SWNL+.75*OWL+18*(TC-TA)/RC'overnight heat (Btu)
200 C=ONH/(TS-TMIN)'ceiling mass (Btu/F)
210 DW=12*C/62.33/64'ceiling water depth (inches)
220 CDH=(TI-TA)*64*(1/RVS+3/RVW)+(TMIN-TA)*64/RC'cloudy day heat
(Btu/h)
230 CD5=5*24*CDH'heat for 5 cloudy days (Btu)
240 CC=CD5/(TS-TMIN)'cloudy day capacitance (Btu/F)
250 CTD=12*CC/62.33/36'cloudy day floor tank depth (inches)
260 PRINT TS,TMIN
270 PRINT C,DW,CTD
sunspace min ceiling
temp (F) temp (F)
158.9396 79.58628
ceiling water depths (inches) cap (Btu/F) ceiling
floor
147.4126 .443444 6.864856
Nick
What about 2 weeks of overcast sky and 10 below temp ?
In that case, use a large thermal store. I favor the earth under
the house.
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