Hi,
I am trying to model an urban area with different buildings. Each building has a commercial ground floor and upper floors are residential.
I would like to have a heat pump for each building capable to fulfill also DHW.
I cannot find a way to do this. Results show that water production is made with district heating water as shown in the attached image.
Any suggestions?
Thanks in advance.
Erika
Hi @erikas ,
Sorry for the late reply here. To model heat pump water heaters in dragonfly, you’ll want to use the DF SHW System component along with the HB SHW Templates component to specify that you want to model a heat pump system.
Just bear in mind that you will have to set the _condition_ of the SHW system to be one of the Room2Ds of each building in order to use a heat pump system since the heat pump will pull heat from that room to make the hot water.
Hi, @chris
Sorry to bother you. In terms of “Just bear in mind that you will have to set the _condition_ of the SHW system to be one of the Room2Ds of each building”, may I ask how can I set the _condition_ of the SHW system to be the Room2Ds? Since my project is an apartment, I prefer to apply split-HPWH system within each unit.
As the screenshots showed, I just tried to connect the _condition_ of the SHW system with Room2D output, but they are not working. (I just made a random test case here.)
Hope to get your reply, thanks.
Hey @Gevy ,
You are are supposed to get a more helpful message in this case and the fact that you don’t get a good message is a bug that I’ll fix.
But the room needs to be conditioned in order for the heat pump water heater system to be placed within it. Otherwise, you almost always get the room temperature running away into values around absolute zero with the types of service hot water demand that you find in a large office. Of course, in a real world scenario, the heat pump would probably just fail or switch to some electrical resistance mode when room temperatures became sub-zero.
But just set the room to be conditioned and you will find the component succeds.
I pushed a change so that you now get a better error message, @Gevy.
Thanks to get your reply. I really appreciate it:)
Hi, @chris ,
Sorry to bother you again.
I just met a problem. As I mentioned before, my project is a mass housing block (in Nairobi, Kenya). The local mild climate and target audience (low-income families) mean the housing does not need to use any HVAC system.
But I would like to compare the performance of split heat pump water heaters with split electric water heaters. To ensure the heat pump water heater operated successfully, I set the apartment room’s condition to true, but then set the Ideal air HVAC schedule to be off at all times.
Perhaps I don’t fully understand this simulation platform yet. It seems that heat pump water heaters are installed indoors by default. I’m wondering if there’s a way to place them outdoors to avoid them affecting the indoor temperature while operating. My current simulations show no convergence after 25 days of warming up, which I suspect is mainly due to the indoor heat pump water heater.
May I get some suggestions from you to support mass housing development in undeveloped coutries?
Thanks a lot for your attention.
