Domoticz

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-- dzVents script Heat-Counter - Created and run in Domoticz events
--
-- Time based Script to see how much revenue I get from my Solar Hotwater Boiler
-- The temperature increase is calculated and converted to kWh to make it comparable with Solar generated energy
-- The energy is counted by an Energy counter device
-- The increase of the temperature is stored in a user variable HeatBattery 

--Manually create and/or define below (newly created virtual) devices and 'User Variables' by user given names
local Btemp = 62                            -- Temperature of the Solar Hotwater Boiler
local Bpump = 64                            -- Boiler pump activity

-- To be created virtual devices in the hardware section of Domoticz:
local idxvsec = 82                           -- (1) Custom Sensor name for the 'Virtual Solarheat Energy Counter'

-- User Variables:
local battery = 'HeatBattery'                -- User Variable name for the 'Heat Battery Capacity' increase  °K                      
local VarHeat = 'Temp_Heat'                  -- User Variable to store temporary temperature                          

-- Define variables, used in this script. Don't change!!!
local new_temp
local old_temp
local delta_temp
local boiler_gain
local boiler_usage
local old_bat_value
local new_bat_value



local ScriptVersion = '0.0.1'

return {
	active = true,
	logging = {
	    level = domoticz.LOG_DEBUG,    -- Uncomment this line to override the dzVents global logging setting
		marker = 'VSEB '.. ScriptVersion
	},
	on = {
		timer = { 'every minute' },
		devices = { Bpump }
	},
	
	execute = function(domoticz, triggerItem)
	    -- Execute every minute, but only when the boiler pump is running.
	    if (triggerItem.isTimer and domoticz.devices(Bpump).percentage > 0) then
        domoticz.log('Script is running.', domoticz.LOG_DEBUG)

        -- Get actual temperature of the Solar Hotwater Boiler
	    local temp = domoticz.devices(Btemp).rawData
	    
        new_temp = tonumber(temp[1])
        old_temp = tonumber(domoticz.variables(VarHeat).value) 
        domoticz.log('New Boiler temperatuur = '.. new_temp, domoticz.LOG_DEBUG)
        domoticz.variables(VarHeat).set(new_temp)
        
        -- Check the temperature change since last update.
            -- A positive number means an increase of the Boiler temperature and negative number means a decrease of the Boiler temperature
        delta_temp = (new_temp - old_temp)
        domoticz.log('Temperature change = '.. delta_temp ..' °K', domoticz.LOG_DEBUG)
        if delta_temp <= 0 then
            local boiler_usage = delta_temp     
            domoticz.log('Decrease of the Boiler temperature with '.. boiler_usage ..' °K', domoticz.LOG_DEBUG)
        else             
            -- An increase of the Boiler temperatur. Get the last value from the HeatBattery
            local boiler_gain = delta_temp
            old_bat_value = tonumber(domoticz.variables(battery).value)
            domoticz.log('Increase of the Boiler temperature with '.. boiler_gain ..' °K', domoticz.LOG_DEBUG)

            -- Calculate the new battery value by adding the delta_temp to the previous battery value. (only increase of the battery)
            new_bat_value = (old_bat_value + boiler_gain)
            domoticz.variables(battery).set(new_bat_value)
            -- Convert temperature increase to kWh ==>  1 °K increase = (200 L * 4.186 J * 1 °K ) / 3600 = 0.23256 kWh
            local count_val = tonumber(domoticz.utils.round((new_bat_value * 0.23256),3))
            domoticz.log('New counter value =  '.. count_val ..' kWh', domoticz.LOG_DEBUG)
            -- Energy valaue is added to the Virtual Solarheat Energy Counter
            domoticz.devices(idxvsec).updateCustomSensor(count_val)
        end -- delta_temp
        
        end -- triggerItem
    
    end -- execute 
}