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. Air Quality Hubiat Prototype 1 of control system

 Matt Resinger on youtube has a lot of videos about the subject. He’s a custom home builder, so he does favor the more expensive materials. But he’s also very focused on making sure things last a long time. I find a lot of his stuff interesting. Here’s one where Matt talks ERV vs HRV Here are a couple This Old House videos on the ERV subject: Seeing it work with smoke bombs A discussion on indoor air quality

Encouraging results  from logged data. Very stable internal environment in the house.  Energy use for Greenway Room temperatures All rooms are very similar so the heat is being distributed evenly it seems.  Room humidity Very important as we are still having col mornings the humidity is also very well distributed.  

I do want to increase the maximum flow rate for the inlet so an additional fan in the inlet filter should help overcome the blockage in the filter its self and heat exchanger core. New filter fan to be placed in the inlet duct. Its in a Sistema box that fits the following filter almost perfectly Features: Double-layer activated carbon filter cloth High filtration efficiency High dust holding capacity Good temperature Resistance Economical, practical and easy to install   There is an additional mesh filter to catch larger debris like leaves  Airflow Sound level

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...

  My code is wrong in the driver for wind speed or the sensor is not good enough at such low speeds.   Measured with an anemometer Exhaust velocity  6.864  m/Sec mean  Mass Flow  0.121296892 m/Sec3  That's  7.2778  m/Min3  Therefore it is extracting 165m3 in 23 minutes That what I originally wanted 8 m/Min3 woo hoo

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  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 

I need to understand this properly I think maybe it will explain whats happening here I don't understand how I get a smaller delta T stale - exhaust than between inlet and fresh, if the temperature boost is a result of heat being exchanged? Checked for leaks and instrumentation. I saw similar phenomenon with the small scale experiment, strange. I need to know why. Given: Q l  = h we  ρ q Δx / 3600  Is it  Δx = difference in  humidity ratio  ( kg h2o /kg dry_air )   causing this reading? Seemingly double the  ΔT  inlet to fresh than stale to exhaust. Curtesy of  https://www.engineeringtoolbox.com/ Latent Heat Flow Latent heat is the heat, when supplied to or removed from air, results in a change in moisture content - the temperature of the air is not changed Latent Heat Flow - SI-Units The latent heat flow due to moisture in air can be expressed in SI-units (metric) as Q l  = h we  ρ q Δx / 3600    ...

Alexa Integration   Circuit Design We made an EVSE from parts on Banggood & Aliexpress mostly 16A 3.7 kW EV charging controller board + Type 1 EV  Current Sensor This is the key component for controlling charge level and auto shut off at the end of the charge. Probably saves a wee bit of energy with the power to the EVSE disconected in the off state also. Irms = emon1.calcIrms( 1480 ); // Calculate Irms only Kw = (Irms * 230.0 ) / 1000.0 ; float hours = (millis() - lastMillis) / ( 1000.0 * 3600.0 ) ; TotalChargeHours += hours; lastMillis = millis(); //CALC KWH if ( abs (Kw) > 0.1 ) KWh += (Kw * hours); Note: You must add a suitable burden resistor if one is not on the CT board already or the high voltage will damage the Arduino. The one shown has a burden resistor. PCB size 30.0mm X 24.0mm X 1.6mm Compatible interfaces 2.54 3-pin interface and 4-pin Grove interface Transformation coefficient 1000:1 Input current 0 - 5 A Output current 0 ...

 You can get from Christchurch to Hokatika now in a 30KWh Leaf due to new rapid chargers. The elevation is around 900 meters at Castle Hill Should have plenty of range dropping down into Hokatika around 4.7KWh of gravitational potential, which is around 26 KM of range in the Leaf. Rule of thumb for a Leaf 30 is 1000meters of elevation is 15 to 20% range  from experience. Add caption https://www.omnicalculator.com/physics/potential-energy There's an online calculator for everything nowadays

I think I'll build one of these https://woodgears.ca/dust_collector/impeller.html Credit  https://woodgears.ca/ I need to cost this out properly I suspect the valves will push the cost up to high might bi simpler to build a fan What about this This might be better and more compact The valves I want a booster exhaust air mover that can say exchange all the air in the house in 15 or 20 minutes The calculation above shows I can do this with one or two 75cm gym ball lungs. So the idea is make a rolling diagram or ball compressor from 2 NZ$12 gym balls and a windscreen wiper motor. So 45 decrees of travel in 2.5 seconds? A wiper motor can do that but the Torque needed at a radius of say 50cm would be?????? Hard to say these is virtually no air pressure however the ball has significant wall thickness best discovered by experimentation,. I think. Torque needed to excerpt 2kg of thrust at 50cm is approximately 9.81 Nm unsurprisingly, or 1kg/Meter. Can a wiper motor deliver 1kg at a half me...

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  Decent low energy cost for all electric heating 3.5KW heat pump and a 2KW electric convection heater. Energy consumption The raw data is here  The data shows the device switching on and off under control of Hubitat