Greenway

 

  As ever on a budget waste not want not approach. mostly stuff I had in stock Code ERV Code Six individually fused channels Power board shown in place. 35 Amp Hall effect current sensor. Driver code here  ERV Code Dashboard for ERV fan control and testing      Six controlled channels with 25Khz PWM fan speed control The first layer of the system. Two Arduinos one for control one for networking, Code here  ERV Code

 

A bit or research and it seems a plenum on the outlet of the heat exchanger seemed worth a try. 60 Litre Plenum on the vent side. Seems to make the vents more balanced measuring the flow I can regulate the rate more evenly with one vent having less effect on the others, I'm going to add a presure sensor to the chamber see if there is any pressure in it I noticed coupling between room vents. e.g. I set one room and move to the next then recheck the first vent and its flow rate was changed. I was never happy with all those Y junctions, a very poor manifold design I suspect. As an added bonus its made the vent even quieter too. It works well within a range I can set the vent flows independently of one another, also the living room and office flows are much improved which have the longest ducts. The flow at the office and living room are 50% higher if needed now which is great for working at home. The office got warm and sticky in the past, not anymore. More Photos Sound test My refere

  Measured Mass Flow in Exhaust Port of ERV  4.4 mS through 15cm duct = 0.0777 m/sec3  so 165m3 is removed in 35 Minutes DAS Reports 0.102 mean with the pitot tube in the exhaust duct 

Smart control: - reduces power costs of air handling units - adjusts ventilation to your everyday needs - provides a wide range of control options It has been estimated that smart control allows to half the average cost of electricity for ventilation.

 We get around a 1C boost to the fresh air from loft heat exchange with the duct. The loft is consistently between 4 and 15 C hotter than the outside air and even at night boosts heat in the fresh air duct to the living room. An unanticipated benifit

  Drop on exiting air 2.9C Heating of incoming air 2.5C So 86% of the heat recovered

  We have a data logger running every 6 minutes we save stripes of data from Hubitat to disk using a call to my Tiny Webserver in Rule Machine  See Web Server Source C#

  Living room vents installed. Took around 4 hours including cleanup In the loft. The ducts are determining the location of the ERV core for me I think.

  We are using ducts and diffusers from Bunnings. They come with 3 meters of insulated duct and a Y junction NZ$104 each

The ERV core, source selector valve and exhaust damper valve The Duct We will re-use the vent in the bathroom ad add an additional exhaust vent in the living room. This gives us two air circuits that can be independently controlled, for when the living room door is shut. Furry User Case The cat is in the living room overnight with the door closed and may use the litter so we would want some air exchange in this room while sleeping and keeping the bedrooms fresh.