[BLDG-SIM] ERV (Energy recovery ventilation) simulation in eQuest

[J.L. Niu]

Therefore for summer season heat recovery, if the climate is hot and humid, total heat recovery with both moisture and sensible heat recovery can offer a better energy saving.

What is more complicated for simulation anaylsis, that total heat exchange effectiveness varies with air conditions on both sides, but a simplfied average effective can be used with reasonable accuracy.

JL Niu
  ----- Original Message ----- 
  From: Brandon Nichols 
  To: BLDG-SIM at gard.com 
  Sent: Friday, August 31, 2007 5:27 AM
  Subject: [BLDG-SIM] ERV (Energy recovery ventilation) simulation in eQuest


  Lan, see this post...

  http://elcca-exchange.blogspot.com/2007/04/equest-parametric-sensible-heat.html

  Here's an excerpt:

  $ FLOAT gives maximum heat recovery but recovers even unwanted heat, so
  $ use this setting for temperature control
  ERV-TEMP-CTRL = MIXED-AIR-RESET

  Also, the ΔT between exhaust and OSA is typically not great, even if its 110°F outside and your exhaust/relief is 85°F, the ΔT is only 25°F -- compare that to even a mild winter condition of 35°F, where the ΔT is double at equivalent exhaust temperature (i.e 85 - 35 = 50°F).

  Regards

  Brandon Nichols, PE, LEEDR AP
  Mechanical
  HARGIS ENGINEERS
  600 Stewart Street

  Suite 1000

  Seattle, WA 98101

  www.hargis.biz

   

  d | 206.436.0400  c | 206.228.8707

  o | 206.448.3376  f  | 206.448.4450






------------------------------------------------------------------------------
  From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Lan Hu
  Sent: Thursday, August 30, 2007 1:54 PM
  To: BLDG-SIM at gard.com
  Subject: [BLDG-SIM] ERV (Energy recovery ventilation) simulation in eQuest


  Hi, all,

  I have problem simulating ERV in eQUSET. In the program I specified ERV effectiveness around 72%, the results show 64% energy saving in heating but just 5% saving in cooling, even when I cut off all the fan tempetrature increase. Anyone has experience or suggestion?. Thank you very much.

  Lan


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