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Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be awapped, but also it applies for HeatExchanger:FluidToFluid.

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be awapped, sawapped, but also it applies for HeatExchanger:FluidToFluid.

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be sawapped, swapped, but also it applies for HeatExchanger:FluidToFluid.

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be swapped, but also it applies for HeatExchanger:FluidToFluid.HeatExchanger:FluidToFluid object.

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be swapped, but also it applies for HeatExchanger:FluidToFluid object.object. Update: @Keigo I was wondering if you have experienced any similar issue with the Heat Exchanger issue, as describd in the following. The issue is that even I could simulate my model using the HX object, I'm still not getting reaonable results. In specific,I added the ollowing 3 sets of Output Variables to my model idf file:

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be swapped, but also it applies for HeatExchanger:FluidToFluid object. object.

Update: @Keigo I was wondering if you have experienced any similar issue with the Heat Exchanger issue, as describd in the following. The issue is that even I could simulate my model using the HX object, I'm still not getting reaonable results. In specific,I added the ollowing 3 sets of Output Variables to my model idf file:

1. Chiller Heat Recovery Inlet Temperature, Chiller Heat Recovery Outlet Temperature, and Chiller Heat Recovery Mass Flow Rate.
2. Fluid Heat Exchanger Loop Supply Side Inlet Temperature, Fluid Heat Exchanger Loop Supply Side Outlet Temperature, and Fluid Heat Exchanger Loop Supply Side Mass Flow Rate.
3. Fluid Heat Exchanger Loop Demand Side Inlet Temperature, Fluid Heat Exchanger Loop Demand Side Outlet Temperature, and Fluid Heat Exchanger Loop Demand Side Mass Flow Rate.

However, I'm getting exact same inlet and out let temperature for Chiller Heat Recovery and Fluid Heat Exchanger Loop Demand Side (number 1 and 3 from the above list. Also, for those two categories (HR Chiller and HX Demand Loop), I'm getting absolute zero mass flow rate. Those indicate some problems about the HR Chiller modeling, especifically about the demand side. Any ideas/thoughts would be greatly appreciated.

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be swapped, but also it applies for HeatExchanger:FluidToFluid object.

Update: @Keigo I was wondering if you have experienced any similar issue with the Heat Exchanger issue, as describd in the following. The issue is that even I could simulate my model using the HX object, I'm still not getting reaonable results. In specific,I added the ollowing following 3 sets of Output Variables to my model idf file:

1. Chiller Heat Recovery Inlet Temperature, Chiller Heat Recovery Outlet Temperature, and Chiller Heat Recovery Mass Flow Rate.
2. Fluid Heat Exchanger Loop Supply Side Inlet Temperature, Fluid Heat Exchanger Loop Supply Side Outlet Temperature, and Fluid Heat Exchanger Loop Supply Side Mass Flow Rate.
3. Fluid Heat Exchanger Loop Demand Side Inlet Temperature, Fluid Heat Exchanger Loop Demand Side Outlet Temperature, and Fluid Heat Exchanger Loop Demand Side Mass Flow Rate.

However, I'm getting exact same inlet and out let temperature for Chiller Heat Recovery and Fluid Heat Exchanger Loop Demand Side (number 1 and 3 from the above list. Also, for those two categories (HR Chiller and HX Demand Loop), I'm getting absolute zero mass flow rate. Those indicate some problems about the HR Chiller modeling, especifically about the demand side. Any ideas/thoughts would be greatly appreciated.

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be swapped, but also it applies for HeatExchanger:FluidToFluid object.

Update: @Keigo I was wondering if you have experienced any similar issue with the Heat Exchanger issue, as describd in the following. The issue is that even I could simulate my model using the HX object, I'm still not getting reaonable results. In specific,I added the following 3 sets of Output Variables to my model idf file:

1. Chiller Heat Recovery Inlet Temperature, Chiller Heat Recovery Outlet Temperature, and Chiller Heat Recovery Mass Flow Rate.
2. Fluid Heat Exchanger Loop Supply Side Inlet Temperature, Fluid Heat Exchanger Loop Supply Side Outlet Temperature, and Fluid Heat Exchanger Loop Supply Side Mass Flow Rate.
3. Fluid Heat Exchanger Loop Demand Side Inlet Temperature, Fluid Heat Exchanger Loop Demand Side Outlet Temperature, and Fluid Heat Exchanger Loop Demand Side Mass Flow Rate.

However, I'm getting exact same inlet and out let temperature for Chiller Heat Recovery and Fluid Heat Exchanger Loop Demand Side (number 1 and 3 from the above list. Also, for those two categories (HR Chiller and HX Demand Loop), I'm getting absolute zero mass flow rate. Meanwhile, I have some non-zero mass flow rate for the supply loop and non-identical temperature between inlet& outlet.

Those indicate some problems about the HR Chiller modeling, especifically about the demand side. Any ideas/thoughts would be greatly appreciated.

Thank you so much @Keigo for your wonderful detailed answer and all your valuable comment and effort. By following your answer, I could fix the sever/fatal error that I was struggling with. Meantime, and just as a reference to anyone who might follow this post in the future: not only in the PlantLoop, demand and supply fileds of the Heat Recovery should be swapped, but also it applies for HeatExchanger:FluidToFluid object.

Update: @Keigo I was wondering if you have experienced any similar issue with the Heat Exchanger issue, as describd in the following. The issue is that even I could simulate my model using the HX object, I'm still not getting reaonable results. In specific,I added the following 3 sets of Output Variables to my model idf file:

1. Chiller Heat Recovery Inlet Temperature, Chiller Heat Recovery Outlet Temperature, and Chiller Heat Recovery Mass Flow Rate.
2. Fluid Heat Exchanger Loop Supply Side Inlet Temperature, Fluid Heat Exchanger Loop Supply Side Outlet Temperature, and Fluid Heat Exchanger Loop Supply Side Mass Flow Rate.
3. Fluid Heat Exchanger Loop Demand Side Inlet Temperature, Fluid Heat Exchanger Loop Demand Side Outlet Temperature, and Fluid Heat Exchanger Loop Demand Side Mass Flow Rate.

However, I'm getting exact same inlet and out let temperature for Chiller Heat Recovery and Fluid Heat Exchanger Loop Demand Side (number 1 and 3 from the above list. Also, for those two categories (HR Chiller and HX Demand Loop), I'm getting absolute zero mass flow rate. Meanwhile, I have some non-zero mass flow rate for the supply loop and non-identical temperature between inlet& inlet & outlet.

Those indicate some problems about the HR Chiller modeling, especifically about the demand side. Any ideas/thoughts would be greatly appreciated.