Greenway

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

  The Hookup For proof of concept seems to run reliably in the lab. I don't want to be up and down ladders to make update I intend keeping the control system in Hubitat so I can tinker to my Hearts content. Boost fan PWM control as well as start relays. The valve position is a separate driver and device in Hubitat, This will use one of the PWM Four boost fans in the ducts for each room inlet. One fan in the two way turbo exhaust valve. The valve position is a separate driver and device in Hubitat, This will use one of the PWM pins on the Wemos and its analogue input for the position pot Hubitat Valve Position Driver import groovy.json.JsonSlurper metadata { definition(name: "Greenway ERV Turbo Valve", namespace: "Greenway", author: "Nick Goodey") { capability "Initialize" capability "Switch" capability "Switch Level" command "on" command "off" } preferences { section("Device&qu

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.

  I wanted to avoid having the Arduino generate the 25 KHz PWM signal for the fan seed control pilot signal. Here ia a cheap as chip's wee board that I have modified to allow the Arduino to send an analogue voltage as fan speed demand. The modification is simply lifting the leg of the two trimmer pots for fans 2 and 3 and connecting that leg to the Arduino output.

  After a few experiments I decided I wanted the following options for the input air source. 1) Fresh air from roof top. Function as a vanilla balanced ERV ventilation system, all exhaust air passes through the heat exchanger, all incoming air is warmed by the heat exchanger. 2) Loft air, typically warmer if the Sun is out even on a cold day. Reduce need for heating during the day. 3) Fresh Air bypassing the heat exchanger to reduce the need fore running the heat pump on sunny days when the air temperature is still quite low. 4) Block all four ports to prevent air moving from convection or an open window raising or reducing air pressure in the room. So the four port valve was born. ts got a dual drive now which works really well. The wooden gear was inspired by the Marble Machine i have toughened the teeth with Epoxy now which make it quite substantial.