[esp-r] Re: Unable to get Dehumidification Energy

Thu Feb 25 10:06:27 GMT 2021

Hello Achim, 

Thank you for the mail.

I can control humidity and get latent load output when using “ideal control” by enabling humidity control.

In this “ideal control” with humidity control enabled, the humidity control stops working if I change the target temperature from dBT to zone resultant temperature.

At the moment, the only way I can get humidity control and latent load output is “ideal control” using dBT as the target temperature.

As I have wrote in my previous mail, I can make a “plant” which affects the humidity as intended.

The main problem is that the latent load is always “0”.

At the moment, the only way that I can get the latent load is by outputting the plant’s “input” and “output” specific humidity, mass flow rate and using a spreadsheet to calculate the latent load.

The result of the calculation gives me confidence that the simulation itself is behaving as it should. The psychometric chart output (of the result analysis) also shows the expected result. 

The only problem is that the latent load is “0”.

I have attached a link to the simple model that I made. 

https://www.dropbox.com/sh/683iczt7iacbsei/AAAlmwjYb8_OEEKE2AO5NqNma?dl=0

Best Regards,

Hiroi Nishimatsu

From: esp-r-bounces at lists.strath.ac.uk <esp-r-bounces at lists.strath.ac.uk> On Behalf Of achim.geissler
Sent: Thursday, February 18, 2021 4:24 AM
To: ESP-r List <esp-r at lists.strath.ac.uk>
Subject: [esp-r] Re: Unable to get Dehumidification Energy

Hi there,

it’s been a while, but did you activate humidity in your zone control? I seem to remember that one had to “activate” humidity in some way and I think it was in the control.

FWIW.

Best

Achim

On 15 Feb 2021, at 08:19, <hiroi at mocha.ocn.ne.jp <mailto:hiroi at mocha.ocn.ne.jp> > <hiroi at mocha.ocn.ne.jp <mailto:hiroi at mocha.ocn.ne.jp> > wrote:

Hello esp-r community,

I am unable to get dehumidification energy values when cooling a room with simple cooler represented by a plant network:

Zone -> Duct_in -> Cooling Coil -> Fan -> Duct_out

I built 3 identical (geometry, surface attribution) zones, all with a simple cooler as described above.

The only difference is the cooling coil inlet water temperature being 5, 10, 15 degC.

Control was set to keep the zone dBT at 27 degc for all zone by controlling the air movement volume through the cooling coil.

This was done to understand the dehumidification capability of a typical cooler and the resulting zone RH.

The simulation result confirmed that the lower temperature cooling coil setup reduces the zone RH, compared to higher temperature cooling coil setup.

Unfortunately, the dehumidification energy as outputted from the “energy delivered” summary (enquire about -> energy delivered in the Result analyser) shows “0” for all zones.

This also the case for the output of the time plot graph.

ESP-r is V13.3.11 but this is also the case with V13.2.6.

Is there anyone who can help me out?

Best Regards,

Hiroi Nishimatsu

Mail: hiroi at mocha.ocn.ne.jp <mailto:hiroi at mocha.ocn.ne.jp> 

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