Combined central heating and domestic hot water heater (combi boiler) for residential buildings

asked 2021-06-23 10:12:35 -0600

LVT gravatar image

updated 2021-07-01 12:14:43 -0600

Hello everyone

I want to implement a combi boiler for central heating and (instantaneous production of) DHW (e.g. in a simulation (EnergyPlus) of a residential (single-family) building. My initial thought was to introduce a Boiler:HotWater for central heating and add an additional plate heat exchanger for DHW in the central heating plant loop. However, the DHW installation in a residential building has no circulation and consequently, a plant loop for DHW didn't seem the most appropriate representation. The diagram below roughly represent the system I want to implement.

image description

So, my question is "how can I implement a combi boiler in my EnergyPlus simulations with a realistic representation of the central heating and domestic hot water production?"

Thank you in advance!

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@LVT "the DHW installation in a residential building has no circulation" does this mean water after being used by draws (sinks, showers, etc.) do not return back to the DHW tank and only go down the drain? If you can add a diagram of the system you hope to model, that would be great.

Aaron Boranian gravatar image Aaron Boranian  ( 2021-06-23 14:56:27 -0600 )edit

@Aaron Boranian That is indeed the problem I am facing. I added a simplified drawing of the diagram, hoping it is more clear now.

LVT gravatar image LVT  ( 2021-06-24 08:53:06 -0600 )edit