asked 2019-02-01 10:37:50 -0500

updated 2019-02-01 18:01:44 -0500

Hi all,

I am modeling an HVAC system based on a Chiller Heater unit and I have two question that I’m trying to solve:

  1. Considering to model it using the object “Central Heat Pump System” and definitions of the reference guide, only water cooled solutions seem to be allowed. The unit I’m modeling is air cooled: if I Knew the different curves required would it be any chance to “force” the input maybe using the “temperature source” object (to consider the real temperatures entering in the condenser/evaporator)? I’m wondering what happens when external temperatures go below zero.
  2. I'm in doubt about the input of the field “Number of the chiller heater modules”. I’m considering a system based on a single standard unit (EU market). I’d fill the field with 1. (unfortunately this is my first post and I have no rights to upload the diagram I made..). Probably I’m confused because of the diagram in the reference guide that shows a solution made of three modules (but I suppose it is to explain the typical configuration made of more than one module). Anyway I want just to make sure the term “module” is referred to the “packaged unit”(able to work stand-alone) and not to internal components (e.g. number of circuits/compressors).

I appreciate your help

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Is this what you mean by an air cooled chiller-heater? https://unmethours.com/question/1898/...

MJWitte gravatar imageMJWitte ( 2019-02-07 16:43:07 -0500 )edit

I think it refers to a standard reverse cycle air conditioner, able to warm or cool water by reversing the flow of refrigerant. The system I'm looking at is able to work in recovery mode, similar to the one described by the Central heat pump system object except for condensing side. My idea is to generate the curves required considering ranges of temperatures wide enough to include most of external air temperatures. Then, I would use the TemperatureSource (as described in your link). Otherwise I'm going to switch to the two independent systems (water heater+air cooled chiller).

Francesco Ferretti gravatar imageFrancesco Ferretti ( 2019-03-03 14:20:29 -0500 )edit

follows the previous comment: probably this second solution will be less efficient (excluding recovery mode) but I cannot find other ways at the moment.

Francesco Ferretti gravatar imageFrancesco Ferretti ( 2019-03-03 14:37:40 -0500 )edit