[Equest-users] Boiler temperature for hybrid geothermal heat pump system

[Sharad Kumar via Equest-users]

Hi Siliang,

I think that i was right in the discussion.

The boiler set-point should be lower than the heating ground water steam
exchanger.

See the following cases:

1. The boiler set-point can be higher than the ground steam water heat
exchanger if you apply some extra heat or fuel and you apply more than one
fuel then it can be a hybrid boiler. So electricity can be the fuel to
enhance the heat.

2. If the boiler is of less size then there can not be any scope to
increase the set-point of the boiler as there can not be any extra heat
added to the boiler as it is only again a heat exchanger.

The temperature that the 360 or 370 °F i am talking about is the steam
coming out of the earth crust.

*Thanks,*
Sharad.


---------- Forwarded message ----------
From: Siliang Lu via Equest-users <equest-users at lists.onebuilding.org>
To: Sharad Kumar <sharadcapricious at gmail.com>
Cc: equest-users <equest-users at lists.onebuilding.org>,
equest-users-request at lists.onebuilding.org
Date: Mon, 8 Aug 2016 08:58:55 -0400
Subject: Re: [Equest-users] Boiler temperature for hybrid geothermal heat
pump system
Hi Sharad,
 Thanks for your reply.
 My design is ambient geothermal heat pump system. The water loop
temperature ranges between 55-85F and the ground temperature is not so high
as 360-370F. What I am wondering is that if the boiler setpoint could be
much higher than ground heat exchanger setpoint if the size of boiler is
much smaller than that of GHX? Thanks a lot!

Have a great day!

All the best,
Siliang
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