Re: [EnergyPlus_Support] Refrigeration Energy Increase by Adding DOAS on HVAC System

["Tilek Aberra tilek.aberra@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Hi,
If  the refrigration load you are referring to is that of the retail display cases, then they may (now) be operating in warmer and more humid ambient and this causes the rack load to increase. You can see it this way alternatively. When the no of the unmet hours reduced do the average temperature (also humidity) inside the retail store reduced or not, if it increases your result make sense; otherwise there is some other bug in the calc. Esp humidity increase has more effect
TA

On 2 Feb 2016 7:01 pm, "hidayah.annisanurul@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Hi Groups, 

I have some trouble with the energyplus result. I am modeling a retail building with so many refrigeration cases on several zones. I use HVAC Template : chilled water loop with fan coil units. Then, I add the DOAS template to the fan coil unit. I only use one DOAS for all fan coils. 

The total cooling energy in table "energy end use" after adding the DOAS is reducing, but the refrigeration energy increase. Meanwhile, the time cooling setpoint not met is reducing from 400 to 100. 

So, it is very confusing for me, I think the refrigeration energy should be reduced when the time cooling setpoint not met reduced. 

And why does adding DOAS can impact the refrigeration case energy? The energy increment for the refrigeration is more than the energy reduced by adding the DOAS. So, overall, after adding DOAS, the sytem became more inefficient.

Hope someone had faced the same problem before and can help me to explain this! 

Thanks     

   

__._,_.___

---

Posted by: Tilek Aberra <tilek.aberra@xxxxxxxxx>

---

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Visit Your Group

• New Members 13

• Privacy • Unsubscribe • Terms of Use

__,_._,___