Re: [TRNSYS-users] Water-water heat pump and domestic hot water tank

[Jeff Thornton <thornton@tess-inc.com>]

Luminita,

1 - are you operating at sufficiently small timesteps to properly control the system?  Ideally in the 1-3 minute range.

2 - did you size your heat pump to meet the load or just use a default size?

3 - do you have your controllers set up properly to turn on and off the heat pump based on the tank temperatures?

4 - have you watched all the outputs from your models using an online plotter?  Have you used the trace feature to see which model is causing the problem?

Jeff - TESS

Sent from my iPhone

On Jun 27, 2020, at 9:14 AM, Lumi Dumitrascu via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:



Good morning,

 

I am trying to simulate a water-water heat pump (Type 927) which is able to provide space heating/cooling, domestic hot water heating, as well as cooling a tank for dehumidification.

The problem I have is that whenever the hot water is required, the pump goes on and the temperature of the tank increases up to 3000 degrees. After it is slowly decreasing to an average temperature of 15 degrees.

I have tried to follow the ZNE_House model provided with the software but the behaviour in this case is the same. The temperature of the tank jumps to thousands of degrees.

 

Thank you very much and I am looking forward to hearing from you.

 

Luminita Dumitrascu

 

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