[TRNSYS-users] TRNSYS Wizard Problem

2012/6/1 <trnsys-users-request@cae.wisc.edu>

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Today's Topics:

1. flow rate with precision (Guilbert Sara)
2. Water-to-water heat pump - Heat rate to load control
(Damien Casetta)

---------- 已转发邮件 ----------
From: Guilbert Sara <wissantaise@gmail.com>
To: trnsys-users@cae.wisc.edu
Cc:
Date: Fri, 1 Jun 2012 11:38:22 +0800
Subject: [TRNSYS-users] flow rate with precision

Hi Trnsys-users,

I modeled a chilled water system with several fans coils unit on TRNSYS, I focalize on the repartition of the flow rate in it. The point is, I don’t know if there is a configuration which considers the water delay from the pump to the coils. And if the type 31 (pipe) induce a new flow rate repartition because of the pressure difference. And if I want that how I do ?

Thank you for your help

Sara

CETHIL Lyon

---------- 已转发邮件 ----------
From: Damien Casetta <damien.casetta@gmail.com>
To: trnsys-users@cae.wisc.edu
Cc:
Date: Fri, 1 Jun 2012 18:10:09 +0200
Subject: [TRNSYS-users] Water-to-water heat pump - Heat rate to load control
Hi,

I am modelling a ground-source heat pump system including a water-to-water heat pump (type 927), a borehole heat exchanger (type 557b) and a building demand profile.

I have read a couple of messages in the archives about this topic but I haven´t understood correctly the few addressing my specific issue.

Here is my point. I assume the heat pump to meet the building demand. The aim is then to force the heat pump load and observe how the system behaves (COP, ground loop fluid temperatures).

I would be able to do this with an external MATLAB code (with COP values interpolated from catalog data) but it would be a shame not to harness TRNSYS potential (there is no need to re-invent the wheel as I read in a previous message).

Let me put in other words: how to control a heat pump load?

I have read about a trick to handle this, with a "lump" temperature but I don't get the idea behind it. Any other explanations is welcomed.

Thanks in advance,

Best regards,

--
Damien Casetta

Chalmers University of Technology | Energy and Environment | Exchange student

INSA Lyon Génie Energétique et Environnement | Elève ingénieur

+46.7.60.66.31.45

+33.6.71.78.03.75

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