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Removing a Low Loss Header from Samsung Gen6 System

EcoBaker · 2024-03-28T23:00:46Z

My system has a low loss header, which for effiency I’d like to remove. Currenlty averaging a daily COP of 3.5 to 3.8, which is good but I’d like it to be better. I have a 8k Samsung gen6, however all the installation information from Samsung or Joule says to use a header or buffer. My system map is this, its fairly simple one zone in two bedroom mid terrace. Those of you with Samsung gen6 HP do you have a system without a header or buffer, my plan was to just remove it and connect up the flow and returns and see what happens. I just want to make sure I’m not doing something catastrophic before its done.

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Air Source Heat Pumps (ASHPs)

Last Post by bontwoody 2 years ago

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iancalderbank

(@iancalderbank)

Prominent Member Contributor

Joined: 4 years ago

Posts: 643

05/04/2024 10:32 am

also its worth saying, the PWM pump is not the enabler to run at low flow temps. That comes from having big enough emitters, properly balanced, etc.

what the PWM does is control the flow rate up/down to maintain the DT , at lower output levels when running in a steady state for a long period. For a given lower output, you can have either the flow rate staying the same (Fixed speed pump) and DT reduced, or the DT can stay the same and the flow rate reduces (variable speed pump).

there is an FSV , can't remember the number of the top of my head, for Target DT. with a PWM pump in the system, the samsung will vary the flow rate to try to maintain this DT but only when its in the stable part of a heating cycle. It has no effect when doing DHW, or when in the initial startup part of a heating cycle (Which is 30-60 mins , at least on my system). This FSV for DT control method has no function if you don't have a PWM pump (this is a common misconception), and is of little use in a system with primary/secondary seperation.

My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
11.9kWp of PV
41kWh of Battery storage (3x Powerwall 2)
2x BEVs

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bontwoody

(@bontwoody)

Noble Member Contributor

Joined: 4 years ago

Posts: 1012

05/04/2024 8:08 pm

@iancalderbank Thanks for that explanation Ian, very interesting and useful

House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60

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EcoBaker

(@ecobaker)

Trusted Member Member

Joined: 2 years ago

Posts: 45

Topic starter 06/04/2024 4:45 pm

@iancalderbank Ah okay, thats interesting. I have to say deciphering the user manual and FSV values is one of the most difficult parts of owning a samsung heat pump.

Samsung Gen6 8kw ASHP in a two bed victorian mid terrace.

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bontwoody

(@bontwoody)

Noble Member Contributor

Joined: 4 years ago

Posts: 1012