[esp-r] Re: casual gain input standard

[Achim Geissler]

Hi Minhwan Kim

 

some data from various sources:

 

1.       You can assume that the electricity is converted to heat for small power. 250 W specification = 250 W internal gain as long as it is running. If any small power source has a “standby mode”, the specs usually also give the wattage for this. Again, this wattage can be assumed to be injected into the zone as sensible heat. The “convective / radiative” split is approx 60c, 40r, typically (depends on casing etc. , a PC will typically have even more convective, as the casing usually does not get very warm. A Laptop will have more radiative, possibly).

2.       Attached is (hopefully) a graph (“Wärmeabgabe” = heat gain, “Strahlung” = radiation, “Wärmeleitung” = conduction and “Verdunstung” = latent). The range between 19 and 30 degC “Lufttemperatur” = air temperature is the region of interest, of course. Here overall heat is approx. 120 W/Person with the temperature dependant split as given in the graph. This can be scaled to other heat gains, e.g. 131 W for “normal office work” [Zürcher et. al., 2003].

3.       According to Swiss recommendations: 10 – 12 W/m2 installed is good (currently) and 15 – 18 W/m2 is easily reached when not carefully designed.

 

Best regards

Achim

 

 

 

 

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of ???
Sent: Mittwoch, 5. August 2009 20:20
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] casual gain input standard

 

Hi all~

 

We are looking for any standards or typical practice for

 

1. conversion factor from electric power of appliance (e.g. personal computer) to casual gain

 

2. ratio of  sensible and latent heat in occupants casual gains

 

3. typical lighting casual gains in office or in laboratory.

 

cuz there is almost no standards in Korea yet regarding this issue.

 

Any hints or idea will be very much appreciated.

 

Thank you in advance.

 

Minhwan Kim

-- 
Researcher,
Integrated Simulation Team, DASS consultants Ltd.

632-9 Guui 1(il)-dong Gwangjin-gu Seoul (143-834 Korea) 
T. 82.2.913.2585/ F. 82.2.949.2585/ H. www.dasskorea.com

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