[TRNSYS-users] desiccant type 683

[David BRADLEY]

Dear Mehdi,
   There are a couple of issues going on here. First, Type91 is a 
sensible heat exchanger that is intended to be used with liquid on both 
sides. You can use it for a water to air heat exchanger but you need to 
use a Type33 on the outlet side to compute the humidity of air leaving 
the heat exchanger. Keep in mind that the heat exchanger will only 
transfer sensible heat  so you have to assume that the absolute humidity 
ratio of the air going in to Type91 is the same as the absolute humidity 
ratio of the air leaving Type91 (only the temperature and the relative 
humidity change).

   Second, it sounds as though you need a version of Type683 that will 
calculate the outlet humidity ratio based on a known regeneration air 
temperature. There are two options here. If you are able to update to 
Trnsys17 and the TESS HVAC Library for Trnsys17, then Type683 is now 
available in two modes, one that calculates the required regeneration 
air temperature to achieve a desired humidity setpoint and one that 
calculates the outlet humidity given a known regeneration air inlet 
temperature. If you need to stick with your current Trnsys version then 
you can put an auxiliary air heater on the outlet of your Type91 and 
further heat up the air if it is not sufficiently hot to achieve the 
dehumidification that you want.
Kind regards,
  David


On 10/21/2012 11:17, Mehdi Salehi wrote:
>
> Dear Dr. Sir/madam
> I am phd student in Solar Energy Research Institute ( SERI) National 
> University of Malaysia.
> I would like to inform you that my project is solar two 
> stage desiccant cooling. I working on simulation by Trnsys, but I have 
> problem for type 683 rotary desiccant dehumidifier. I don't know How I 
> can arrange set point humidity ratio of exit process air to find 
> temperature of regeneration air required.
> I used heat ex-changer (type 91) to transfer heat from solar system 
> while the outputs of type 91 are just flow rate and Temperature and 
> there is no humidity ratio to connecting to input ( humidity ratio) of 
> type 683. but I can connecting humidity ratio of output fresh air of 
> heat recovery heat ( type 760 b) to input humidity ratio 
> of regeneration type 683 . I can send to you my simulation by 
> attachment file,If you need.
>  Kindly please advice to me for simulation by type 683.
>
> Your cooperation is highly appreciated.
> Best Regards,
>
> Mehdi Salehi
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> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
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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