Wood-oven w/ water heater: calculate energy transfer

BJ-Axel · January 4, 2024, 11:33am

Hi guys, I am currently working on calculating the Energy (Watt-hors) my wood oven transfers to the H/P reservoir.

Basic system:

Heat Pumpe, 3.6kW el. / 10kW heat power, ground-source, fed by PV
Wood oven with water jacket, generates 15kW of heat of which 5kW go into the room’s air, 10kW go into the water
Heat reservoir, 1.000l of water, feeding my entire home’s heating and hot water
Pump (1800lpm) and 3-way mixer, PID-controlled oven influx temperature of min. 60°C (to avoid soot) - three temp readings done by a Shelly UNI (oven return, oven feed - mixed, reservoir feed pre-mixer)
Heat reservoir feed temperature from oven: 64-80°C

Scope:

Calculate the transfer ratio from the total oven water throughput into the heat reservoir in percent, based on three temperatures (oven input, oven output, heat reservoir cold water input)
Calculate the energy transfer (in kWh), based on water temperature, pump throughput and transfer ration
Display both results in HASS

Problem:

Ratio calculated but, cannot calc the energy transfer

Function Code snippets:

Transfer Ratio

// Assuming msg.payload contains the temperature sensor data
var temperature1 = msg.payload["sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_1"] || 0; // Temperature from sensor
var temperature2 = msg.payload["sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_2"] || 0;
var temperature3 = msg.payload["sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_3"] || 0;

// Calculate the heat transfer ratio
var heatTransferRatio = 100 - ((temperature2 - temperature3) / (temperature1 - temperature3)) * 100;

// Round the result to the nearest whole number
heatTransferRatio = Math.round(heatTransferRatio);

// Set the heat transfer ratio as a global variable
global.set("heatTransferRatio", heatTransferRatio);

// Set the heat transfer ratio as the payload
msg.payload = heatTransferRatio;
return msg;

Energy Transfer:

// Assuming msg.payload contains the temperature sensor data
var temperature1 = msg.payload["sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_1"]; // Temperature from sensor

// Pump flow rate in liters per minute
var pumpFlowRateLitersPerMinute = 1800;

// Specific heat capacity of water in J/(kg·°C)
var specificHeatCapacityOfWater = 4186; // This is an approximate value, you may need to adjust it

// Density of water in kg/L
var densityOfWater = 1; // This is an approximate value for room temperature

// Access the heat transfer ratio from the global variable
var heatTransferRatio = global.get(heatTransferRatio) || 0;

// Calculate the mass of water in kg
var massOfWater = (heatTransferRatio / 100) * pumpFlowRateLitersPerMinute * densityOfWater;

// Calculate the energy transferred in joules
var energyJoules = massOfWater * specificHeatCapacityOfWater * temperature1;

// Convert joules to watts
var energyWatts = energyJoules / 60; // Assuming 60 seconds in a minute

// Set the result as the payload
msg.payload = energyWatts;
return msg;

Won’t work. “Error: Invalid context key”
I also tried to join the percent and oven-temperature into one message to feed the function node. No success.

Any idea?

BJ-Axel · January 11, 2024, 5:45pm

Update:
I did join all three parameters into an array and now the delivered heat in kiloWatts works:

// Assuming msg.payload contains the temperature sensor data
// var temperature1 = msg.payload["sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_1"]; // Temperature from sensor Output
// var temperature2 = msg.payload["sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_2"]; // Temperature from sensor Input

// Assuming msg.payload is an array of numbers
var numbersArray = msg.payload;

// Calculate the Temperature differenceputput-input
var deltaTemperature = numbersArray[0] - numbersArray[1];

// Pump flow rate in liters per minute (based on 1800 litres per hour)
var pumpFlowRateLitersPerMinute = 30;

// Specific heat capacity of water in J/(kg·°C)
var specificHeatCapacityOfWater = 4186; // This is an approximate value, you may need to adjust it

// Density of water in kg/L
var densityOfWater = 1; // This is an approximate value for room temperature

// Access the heat transfer ratio from the global variable
var heatTransferRatio = numbersArray[2];

// Calculate the mass of water in kg
var massOfWater = (heatTransferRatio / 100) * pumpFlowRateLitersPerMinute * densityOfWater;

// Calculate the energy transferred in joules
var energyJoules = massOfWater * specificHeatCapacityOfWater * deltaTemperature;

// Convert joules to watts
var powerWatts = energyJoules / 60; // Assuming 60 seconds in a minute

// Convert watts to kilowatts
var powerkiloWatts = powerWatts / 1000;

// Set the result as the payload
msg.payload = powerkiloWatts;
msg.topic = 'OvenPowerkiloWatts'

return msg;

Next challenge is on, how to display this in the HASSio dashboard as a gauge.
I’m still fiddling around with the “call service” node without success.

BJ-Axel · January 30, 2024, 8:55am

Now,

here’s the entire setup for Node-Red, based on a 3-way mixer with temperature adaptation to have the oven water inlet to be always above 55°C to prevent soot.
For the ease of calculation, all variables were converted to global ones plus, sensors were set to display core values in HASSio:

`

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msg.payload[\"sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_3\"] || 0;\n\n// Calculate the heat transfer ratio\nvar heatTransferRatio = 100 - ((temperature2 - temperature3) / (temperature1 - temperature3)) * 100;\n\n// Round the result to the nearest whole number\n// heatTransferRatio = Math.round(heatTransferRatio);\nheatTransferRatio = heatTransferRatio.toFixed(1);\n\n// Clamp the value between 0 and 100\nheatTransferRatio = Math.min(100, Math.max(0, heatTransferRatio));\n\n// Only set value when oven is burning\nheatTransferRatio = PumpSwitch * heatTransferRatio;\n\n// Set the heat transfer ratio as a global variable\nglobal.set(\"heatTransferRatio\", heatTransferRatio);\n\n// Set the heat transfer ratio as the payload\nmsg.payload = heatTransferRatio;\nmsg.topic = \"heatTransferRatio\"\n\nreturn 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`

BJ-Axel · January 30, 2024, 1:18pm

Now, using an integral the energy my wood-fired oven transfers to the house is easily calculated.

I also have the oven now show up in the “Gas consumption” in my energy dashboard as well!

BJ-Axel · November 11, 2024, 8:18am

Here’s the entire setup. You need three temperature sensors at the three-way mixing unit and tech data on the pump flow to get ratio, power and energy calculated.
I use the temperatures to calculate the ratios, based on Kirchhoff’s current law.

It all shows nicely up in the Energy panel under “Gas consumption”

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Vorlauf","server":"61c89149.6b842","version":3,"exposeAsEntityConfig":"","updateInterval":"2","updateIntervalType":"num","updateIntervalUnits":"seconds","outputInitially":true,"outputOnChanged":false,"entityId":"sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_2","stateType":"num","ifState":"","ifStateType":"str","ifStateOperator":"is","outputs":1,"outputProperties":[{"property":"payload","propertyType":"msg","value":"","valueType":"entityState"},{"property":"data","propertyType":"msg","value":"","valueType":"entity"},{"property":"topic","propertyType":"msg","value":"","valueType":"triggerId"},{"property":"parts","propertyType":"msg","value":"2","valueType":"num"}],"x":130,"y":981,"wires":[["49c447c109d24801"]]},{"id":"49c447c109d24801","type":"function","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"Set.global ovenInput","func":"// Assuming msg.payload contains the sensor output\nvar sensorValue = msg.payload;\n\n// Update the global variable with the new value\nglobal.set(\"ovenInput\", sensorValue);\n\n// Pass the updated value to the next node (optional)\nmsg.payload = global.get(\"ovenInput\");\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":380,"y":981,"wires":[[]]},{"id":"7e35282b10bace08","type":"function","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"Set.global heatTransferRatio","func":"// Assuming msg.payload contains the temperature sensor data\n// Access temperature values from global variables\nvar temperature1 = global.get(\"temperatureOutput\") || 0;\nvar temperature2 = global.get(\"ovenInput\") || 0;\nvar temperature3 = global.get(\"temperatureInput\") || 0;\nvar PumpSwitch = global.get(\"PumpSwitch\") || 0;\n\n// var temperature1 = msg.payload[\"sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_1\"] || 0; // Temperature from sensor\n// var temperature2 = msg.payload[\"sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_2\"] || 0;\n// var temperature3 = msg.payload[\"sensor.shelly_uni_0_6_6_c_ladepumpe_temperature_3\"] || 0;\n\n// Calculate the heat transfer ratio\nvar heatTransferRatio = 100 - ((temperature2 - temperature3) / (temperature1 - temperature3)) * 100;\n\n// Round the result to the nearest whole number\n// heatTransferRatio = Math.round(heatTransferRatio);\nheatTransferRatio = heatTransferRatio.toFixed(1);\n\n// Clamp the value between 0 and 100\nheatTransferRatio = Math.min(100, Math.max(0, heatTransferRatio));\n\n// Only set value when oven is burning\nheatTransferRatio = PumpSwitch * heatTransferRatio;\n\n// Set the heat transfer ratio as a global variable\nglobal.set(\"heatTransferRatio\", heatTransferRatio);\n\n// Set the heat transfer ratio as the payload\nmsg.payload = heatTransferRatio;\nmsg.topic = \"heatTransferRatio\"\n\nreturn msg;\n","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":959,"y":806,"wires":[["87559157a30aa38d"]]},{"id":"87559157a30aa38d","type":"ha-sensor","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"sensor.heatTransferRatio","entityConfig":"e5aa6fef707c2d73","version":0,"state":"payload","stateType":"msg","
attributes":[],"inputOverride":"allow","outputProperties":[],"x":1549,"y":805,"wires":[[]]},{"id":"49e1e0eaae5987a5","type":"ha-sensor","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"sensor.OvenPowerTransfer","entityConfig":"ce391c35b6eb8d0d","version":0,"state":"payload","stateType":"msg","attributes":[],"inputOverride":"allow","outputProperties":[],"x":1559,"y":865,"wires":[[]]},{"id":"868522eee1c1a024","type":"function","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"Oven Energy","func":"// Hole die aktuelle Leistung aus der Nachricht\nvar leistung = msg.payload; // Leistung in Watt\nvar previousTimestamp = flow.get('previousTimestamp') || Date.now();\nvar previousEnergy = flow.get('energy') || 0; // Energiestand in Wattstunden\n\n// Berechne Zeitdifferenz in Sekunden\nvar currentTimestamp = Date.now();\nvar zeitdifferenz = (currentTimestamp - previousTimestamp) / 1000; // Zeit in Sekunden\n\n// Berechne die hinzugefügte Energie in Kilowattstunden\nvar energieZuwachs = (leistung * zeitdifferenz) / (3600 * 1000)\n\n// Kumulierte Energie berechnen (kWh, drei Nachkommastellen)\nvar kumulierteEnergie = previousEnergy + energieZuwachs;\nkumulierteEnergie = Math.round(kumulierteEnergie * 1000) / (1000); // Runden auf ganze Zahl\n\n// Speichere den aktuellen Zustand\nflow.set('previousTimestamp', currentTimestamp);\nflow.set('energy', kumulierteEnergie);\n\n// Gib die kumulierte Energie als Payload zurück\nmsg.payload = kumulierteEnergie;\nreturn msg;\n","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1247,"y":946,"wires":[["fe61e2ce9210577b"]]},{"id":"fe61e2ce9210577b","type":"ha-sensor","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"sensor.OvenEnergy","entityConfig":"04f3e315ab242e17","version":0,"state":"payload","stateType":"msg","attributes":[],"inputOverride":"allow","outputProperties":[],"x":1529,"y":945,"wires":[[]]},{"id":"a5eec25bae6c5767","type":"inject","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"Midnight Reset","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"00 00 * * *","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":680,"y":1000,"wires":[["7dafbfc0f5e2fa3f"]]},{"id":"7dafbfc0f5e2fa3f","type":"function","z":"e3f30e09f01c979f","g":"5b9a39c4104bea1d","name":"Energy Daily Reset","func":"// Setzt die kumulierte Energie auf null\nflow.set('energy', 0);\n\n// Rückgabe der neuen Energie (0) als Payload\nmsg.payload = 0;\nreturn msg;\n","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1270,"y":1000,"wires":[["fe61e2ce9210577b"]]},{"id":"61c89149.6b842","type":"server","name":"Home Assistant","addon":true},{"id":"e5aa6fef707c2d73","type":"ha-entity-config","server":"61c89149.6b842","deviceConfig":"","name":"sensor.HeatTransferRatio","version":"6","entityType":"sensor","haConfig":[{"property":"name","value":"sensor.HeatTransferRatio"},{"property":"icon","value":"mdi:label-percent-outline"},{"property":"entity_picture","value":""},{"property":"entity_category","value":""},{"property":"device_class","value":"power_factor"},{"property":"unit_of_measurement","value":"%"},{"property":"state_class","value":"measurement"}],"resend":true,"debugEnabled":false},{"id":"ce391c35b6eb8d0d","type":"ha-entity-config","server":"61c89149.6b842","deviceConfig":"","name":"sensor.OvenPowerTransfer","version":"6","entityType":"sensor","haConfig":[{"property":"name","value":"sensor.OvenPowerTransfer"},{"property":"icon","value":"mdi:gas-burner"},{"property":"entity_picture","value":""},{"property":"entity_category","value":""},{"property":"device_class","value":"power"},{"property":"unit_of_measurement","value":"W"},{"property":"state_class","value":"measurement"}],"resend":false,"debugEnabled":false},{"id":"04f3e315ab242e17","type":"ha-entity-config","server":"61c89149.6b842","deviceConfig":"","name":"sensor.OvenEnergy","version":"6","entityType":"sensor","haConfig":[{"property":"name","value":"sensor.OvenEnergy"},{"property":"icon","value":"mdi:Campfire"},{"property":"entity_picture","value":""},{"property":"entity_category","value":""},{"property":"device_class","value":"energy"},{"property":"unit_of_measurement","value":"kWh"},{"property":"state_class","value":"total_increasing"}],"resend":true,"debugEnabled":false}]