[TRNSYS-users] FW: PV inverter (Type 48a) to link with hot water tank (Type 534)

[David BRADLEY]

Anas,
   There was an error in the second option that I mentioned in my 
earlier email. The element's control signal should be set constantly to 
1 in this case, not to zero.
best,
  David


On 06/10/2015 09:50, David BRADLEY wrote:
> Anas,
>   The inverter model (Type48) is waiting for the electrical element at 
> the bottom of the tank to tell it that it needs power (i.e. that there 
> should be a load on it). However, the electrical element model 
> (Type1226) is just a simple on/off device; it turns on when its 
> control signal tells it to. The element is waiting for the inverter 
> model and the inverter model is waiting for the element.
>
>   There are a many ways that you could fix the issue but which one you 
> choose really depends on how you want to operate the system. Here are 
> a couple of options:
>
> 1. You can put another aquastat watching the bottom of your tank and 
> controlling the lower element's on/off signal. The controller (and an 
> equation) can then set a value that is either 0 (if the tank is 
> already hot enough) or is the maximum power that the element can 
> deliver. This value will be passed to the inverter as the load. The 
> inverter will then send all of the power that the PV has available to 
> the element (up to the inverter's capacity). Connect the inverter's 
> power output to the element's capacity input.
>
> 2. Often times elements like yours aren't controlled; they just dump 
> whatever energy they can from the PV into the tank. In this case you 
> can get rid of the inverter and pass the PV output power directly to 
> the element's capacity input. In this case leave the element's control 
> signal set to zero.
>
> kind regards,
>  David
>
>
> On 06/10/2015 02:05, Anas Majdouli wrote:
>>
>>
>> ------------------------------------------------------------------------
>> From: majdouli_anas at hotmail.fr
>> To: trnsys-users at lists.onebuilding.org
>> Date: Mon, 8 Jun 2015 11:35:19 +0200
>> Subject: [TRNSYS-users] PV inverter (Type 48a) to link with hot water 
>> tank (Type 534)
>>
>> Hi TRNsys community,
>>
>> For my project, I need to simulate a case : DHW production using PV 
>> panel electricity output as an input for the auxiliary heating within 
>> the tank. I added also an electric aux. heater on the top of the tank 
>> to reach the set point temperature (45°C). The TRNsys file is 
>> attached to this email.
>>
>> I am requesting for your help, because the simulation doesn't seem 
>> working. I think the problem comes from the inverter. Maybe I haven't 
>> linked it correctly to the tank or to the PV panel. Could you help me 
>> please ?
>>
>> Thanks in advance.
>>
>> Yours Sincerely,
>> Anas MAJDOULI
>>
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>
> -- 
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com
>
> http://www.tess-inc.com
> http://www.trnsys.com

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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