Greenway

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                                  (2) where Q l  = latent heat flow (kW) h we  =  latent

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 - 5 mA Sa

 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 

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.

  Control ERV based on AQI Sensor I I really struggle with using Rule Machine...I feel like it has a steep learning curve for some reason. Anyways, I have a PurpleAir Sensor (integrated with HE already) to measure the air quality in our house. When one of the values reaches 45, I want to switch on our ERV (it's already a switch in HE). I then want it to turn off when the value reaches 15. I don't want it to turn off if the Master Bathroom fan is on however. (I have a rule that turns on/off the ERV according to that switch state. Should I combine these into 1 rule? How would it look? The custom attribute used for the sensor will be  aqi10 . https://community.hubitat.com/t/control-erv-based-on-aqi-sensor/36656 Ventilation control  30 1 / 2 Mar 30 6h ago Mar 30 My house has an Energy Recovery Ventilator (ERV) which brings in fresh air from outdoors. It has a heat exchanger to capture heat (or cool) from the outgoing air. Until recently, it was controlled by a controller in the fam