TURTLE wrote:

This is Turtle.

Hiya Turtle.

Nick , Two question here. Nick would you stay in a house at 17ºC and 88% RH?

No. Too cold and moldy.

If you could lower one of them and live there . Which one would you lower?

Neither.

Nick

20 CLO = 1'clothing insulation (clo)
30 MET=1.1'metabolic rate (met)
40 WME=0'external work (met)
50 VEL=.1'air velocity
60 PA=0'water vapor pressure
70 DEF FNPS(T)=EXP(16.6536-4030.183/(TA+235))'sat vapor pressure, kPa
80 DATA 62.6,88
90 DATA 71.689,88
100 FOR CASE = 1 TO 2
110 READ TA,RH
120 TA=(TA-32)/1.8
130 TR=TA
140 IF PA=0 THEN PA=RH*10*FNPS(TA)'water vapor pressure, Pa
150 ICL=.155*CLO'clothing resistance (m^2K/W)
160 M=MET*58.15'metabolic rate (W/m^2)
170 W=WME*58.15'external work in (W/m^2)
180 MW=M-W'internal heat production
190 IF ICL.078 THEN FCL=1+1.29*ICL ELSE FCL=1.05+.645*ICL'clothing factor
200 HCF=12.1*SQR(VEL)'forced convection conductance
210 TAA=TA+273'air temp (K)
220 TRA=TR+273'mean radiant temp (K)
230 TCLA=TAA+(35.5-TA)/(3.5*(6.45*ICL+.1))'est clothing temp
240 P1=ICL*FCL:P2=P1*3.96:P3=P1*100:P4=P1*TAA'intermed iate values
250 P5=308.7-.028*MW+P2*(TRA/100)^4
260 XN=TCLA/100
270 XF=XN
280 N=0'number of iterations
290 EPS=.00015'stop iteration when met
300 XF=(XF+XN)/2'natural convection conductance
310 HCN=2.38*ABS(100*XF-TAA)^.25
320 IF HCFHCN THEN HC=HCF ELSE HC=HCN
330 XN=(P5+P4*HC-P2*XF^4)/(100+P3*HC)
340 N=N+1
350 IF N150 GOTO 480
360 IF ABS(XN-XF)EPS GOTO 300
370 TCL=100*XN-273'clothing surface temp (C)
380 HL1=.00305*(5733-6.99*MW-PA)'heat loss diff through skin
390 IF MW58.15 THEN HL2=.42*(MW-58.15) ELSE HL2=0'heat loss by sweating
400 HL3=.000017*M*(5867-PA)'latent respiration heat loss
410 HL4=.0014*M*(34-TA)'dry respiration heat loss
420 HL5=3.96*FCL*(XN^4-(TRA/100)^4)'heat loss by radiation
430 HL6=FCL*HC*(TCL-TA)'heat loss by convection
440 TS=.303*EXP(-.036*M)+.028'thermal sensation transfer coefficient
450 PMV=TS*(MW-HL1-HL2-HL3-HL4-HL5-HL6)'predicted mean vote
460 PPD=100-95*EXP(-.03353*PMV^4-.2179*PMV^2)'predicted % dissatisfied
470 GOTO 490
480 PMV=99999!:PPD=100
490 PRINT TA,RH,PMV,PPD
500 NEXT CASE

Temp RH PMV score % people dissatisfied

17 C 88 -1.119888 31.42974
22.04945 88 7.560884E-06 5.00000

Innova AirTech Instruments has an excellent comfort web site...
http://www.impind.de.unifi.it/Impind/didattica/materiale/'microclima/innova/thermal.htm