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[EnergyPlus_Support] Re: European radiators, EN442, baseboard rating
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] Re: European radiators, EN442, baseboard rating
- From: "Jean marais" <jeannieboef@xxxxxxxxx>
- Date: Mon, 24 Jun 2013 16:03:39 -0000
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- Delivery-date: Mon, 24 Jun 2013 10:25:48 -0600
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2012 ASHRAE Handbook -- HVAC Systems and Equipment (SI) Section 36.3
q = c(ts-ta)^n
q = heating capacity
c = constant deturmined by test
ts = average temperature of heating medium...(tin+tout)/2
ta = room air temp
n = 1.2 for cast iron radiators, 1.31 for baseboard radiation, 1.42 for convectors, 1.0 for ceiling heating and floor cooling panels, 1.1 for floor heating and ceiling cooling panels. For finned tube, n varies with air and heating medium temps. Correction factors to convert heating capacities at standard rating conditions to heating capacities at other conditions are on Table 2. Standard conditions for convectors are Ts 102ºC and Ta 18ºC (dT = 84ºC).
you have water Ts = (82+71)/2 = 76.5...approx. 75ºC
Ta = 20ºC --> c = 0.54
q(US/energyplus)=0.54*(76.5-20)^1.42 = 166.07 W
Does that make sense?
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