Hello!

I'm trying to model a DHW system with 135 solar panels and a 400kW diesel boiler for backup. Storage tank has 5m3. The objective of this modelling is to audit an existing system.

The objects I used for the simulation are:

• SolarCollector:FlatPlate:Water to model the solar panels;
• WaterHeater:Stratified to model the storage tank;
• DistrictHeating to model the diesel boiler (for simplicity at the beginning)

I started the modelling based on the example file SolarCollectorFlatPlateWater, and changed components to meet my necessities.

However, when running, the following error message appears:

* Severe * InitWaterThermalTank: Detected problem for stratified tank model. Model cannot be applied. * ~~~ * Occurs for stratified tank name = STORAGE TANK * ~~~ * Tank volume = 5.0000 [m3] * ~~~ * Tank use side volume flow rate = 3.8893 [m3/s] * ~~~ * Tank source side volume flow rate = -99999.0000 [m3/s] * ~~~ * Nominal tank change over rate = 1.29 [s] * ~~~ * Change over rate is too fast, increase tank volume, decrease connection flow rates or use mixed tank model

Attached are the printscreens of the main components of the modelling.

Sizing:Plant

SolarCollector:FlatPlate:Water

DistrictHeating

WaterHeater:Stratified

PlantLoop

PlantEquipmentList

WaterUse:Equipment

WaterUse:Connections

Does anyone has the idea of where the problem could be?

Thanks a lot in advance.

Hello!

I'm trying to model a DHW system with 135 solar panels and a 400kW diesel boiler for backup. Storage tank has 5m3. The objective of this modelling is to audit an existing system.

The objects I used for the simulation are:

• SolarCollector:FlatPlate:Water to model the solar panels;
• WaterHeater:Stratified to model the storage tank;
• DistrictHeating to model the diesel boiler (for simplicity at the beginning)

I started the modelling based on the example file SolarCollectorFlatPlateWater, and changed components to meet my necessities.

However, when running, the following error message appears:

* Severe * InitWaterThermalTank: Detected problem for stratified tank model. Model cannot be applied. * ~~~ * Occurs for stratified tank name = STORAGE TANK * ~~~ * Tank volume = 5.0000 [m3] * ~~~ * Tank use side volume flow rate = 3.8893 [m3/s] * ~~~ * Tank source side volume flow rate = -99999.0000 [m3/s] * ~~~ * Nominal tank change over rate = 1.29 [s] * ~~~ * Change over rate is too fast, increase tank volume, decrease connection flow rates or use mixed tank model

Attached are the printscreens of the main components of the modelling.

Sizing:Plant

SolarCollector:FlatPlate:Water

DistrictHeating

WaterHeater:Stratified

PlantLoop

PlantEquipmentList

WaterUse:Equipment

WaterUse:Connections

Does anyone has the idea of where the problem could be?

Thanks a lot in advance.

Hello!

I'm trying to model a DHW system with 135 solar panels and a 400kW diesel boiler for backup. Storage tank has 5m3. The objective of this modelling is to audit an existing system.

The objects I used for the simulation are:

• SolarCollector:FlatPlate:Water to model the solar panels;
• WaterHeater:Stratified to model the storage tank;
• DistrictHeating to model the diesel boiler (for simplicity at the beginning)

I started the modelling based on the example file SolarCollectorFlatPlateWater, and changed components to meet my necessities.

However, when running, the following error message appears:

* Severe * InitWaterThermalTank: Detected problem for stratified tank model. Model cannot be applied. * ~~~ * Occurs for stratified tank name = STORAGE TANK * ~~~ * Tank volume = 5.0000 [m3] * ~~~ * Tank use side volume flow rate = 3.8893 [m3/s] * ~~~ * Tank source side volume flow rate = -99999.0000 [m3/s] * ~~~ * Nominal tank change over rate = 1.29 [s] * ~~~ * Change over rate is too fast, increase tank volume, decrease connection flow rates or use mixed tank model

Attached are the printscreens of the main components of the modelling.

modelling. [C:\fakepath\01.sizing.plant.JPG] (/upfiles/15801279886906408.jpg) (/upfiles/15801279783590061.jpg) (/upfiles/15801279665273053.jpg) (/upfiles/15801279586197834.jpg) (/upfiles/15801279529450353.jpg) (/upfiles/15801279456527095.jpg) (/upfiles/15801279393225686.jpg) (/upfiles/1580127933819217.jpg)

Does anyone has the idea of where the problem could be?

Thanks a lot in advance.