[esp-r] Re: Simulating UFH vs radiators

[Bob Irving]

I'm sorry, my original message did rather assume a British  
background.....

For UFH, I mean "underfloor heating" - distribution of heat by water  
running in pipes immediately below the floor surface.
By radiators, I mean the large flat metal things attached to walls  
which have water running through them to distribute heat.

The theory says that underfloor heating can use lower temperatures  
because of the larger area and is therefore more suitable for heat  
pump heating systems.
Radiator systems are suppose to need higher temperatures because of  
their smaller area.
However, the occupants of the houses, where I am monitoring heat  
pumps, find the temperatures OK though the output temperatures from  
the heat pumps are not that high.

I would like to explore through simulation what's going on.

IES VE does not appear to allow you to specify different heat  
distribution systems. I don't think it allows you to specify the  
maximum temperature for distribution.

I hope that this clearer!

	Bob Irving

On 21 Aug 2009, at 09:12, Achim Geissler wrote:

> Dear Bob
>
> not being attached to the originators of the program, maybe it is  
> for me to
> say: ESP-r can do practically anything. However, "not too much  
> effort" can
> only be expected for the "usual" things.
>
> I understand only half of what you want to do (the abbreviations  
> are a bit
> terse for a "non-native english speaker"), but ESP-r has many  
> possibilities
> in regard to modeling long wave radiation (I assume you mean with
> "radiators").
>
> So, maybe explain what aspects IES can't cover, give more detail in  
> regard
> to where you see simulation-wise problems and maybe simply try it  
> out - it's
> readily available, after all. Probably, ESP-r can do it. But not  
> necessarily
> without (too much) effort.
>
> Achim
>
>
> -----Original Message-----
> From: esp-r-bounces at lists.strath.ac.uk
> [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Bob Irving
> Sent: Donnerstag, 20. August 2009 15:45
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Simulating UFH vs radiators
>
> Dear list,
> I'd like to run some simulations comparing the effects of using
> radiators at lower temperatures with UFH, viz. trying to see how
> oversized rads at what temperatures have to be to deliver the same
> level of warmth as UFH. I have done some monitoring of heat pumps
> retro-fitted in houses with rads where the output temperatures from
> the hps are nowhere near as high as should be expected, yet the houses
> are adequately warm......
>
> I am reasonable well up on IES VE, which I don't think can do this
> simulation, so can ESP-R (preferably without too much effort)???
>
> TIA
> Bob Irving
> PhD researcher
> Oxford Inst of Sustainable Development
> Oxford Brookes University
>
> 01865 484201
> 01285 650281
>
>
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