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Author Topic: "Best" Radiators for use with Heat Pump  (Read 432 times)
Bikerzz
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« on: February 09, 2018, 03:51:14 PM »

Is it as simple as looking for the highest BTU that fits?
Presumably I look at aluminum ones only?
Any recommendations best place to get these?
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linesrg
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« Reply #1 on: February 09, 2018, 08:07:09 PM »

Bikerzz,

Surely you need to start with determining how much energy is needed to heat each space then work out your radiator sizings based on the likes of a delta of 25degrees C?

As I've mentioned elsewhere I used Stelrad K3 which are simple double banked pressed steel radiators with another layer.

Depending on how much energy you require per space there are options like the Dimplex SmartRad's or Myson ULow's?

Regards

Richard

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16 x BP380 on a Lorentz tracker/ SMA SB2500, 16 x Chinese 80W/ SMA SB1700, 16 x BP380/ SMA SB2500. CTC GSi12 heat pump/ Gledhill ASL0085 300litre EHS/ 3off Navitron 4720AL solar ET panels and an Immersun T1060/ T1070/ T1090. 7 x Tianwei 235W/ SMA SB1700/ Growatt SP2000.
rogeriko
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« Reply #2 on: February 09, 2018, 08:22:26 PM »

For a heat pump the best radiators will have fans to get the low temperature heat out. Convection dosn't work at 35 degrees.

https://www.plumbnation.co.uk/site/smith-s-ecovector-ll1200-low-level-hydronic-fan-convector/?gclid=CjwKCAiAqvXTBRBuEiwAE54dcJ7Pqa3kzKoaI5faDExas9yozqjYcN23k_iNI2RX3ULFVO3BqkGXJhoCJxUQAvD_BwE

http://esheatpumps.com/products/fc-fan-coils/
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martin W
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« Reply #3 on: February 12, 2018, 08:25:19 AM »


Is there any info about this anywhere, test's etc? I run my stelrads at 50 deg C flow temperature, and they give out heat wonderfully...

What would be the cut off temperature, below which the radiators won't convect..
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Philip R
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« Reply #4 on: February 12, 2018, 08:51:04 AM »

Do as Richard says, Convection  works at any delta t. You just need to go large, use the heat output calculator.
Aluminium radiators do not offer any more heat output than a well finned steel panel rad. K2 or K3 will convect he's at lower temperatures. Ally one are lightweight and easy to lift.
If you go for fan convectors, you will have to defluff them, especially if you have carpets and pets.
The fan noise is perceptible. The bearings wear out, then you will either have fun and great expense getting the fans replaced.

I fitted column radiators to replace steel panels in a groud source heat pump heated property, a manor house,
the rads work well, perceptibly warm but heat the building effectively.

Philip R
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A.L.
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« Reply #5 on: February 12, 2018, 04:05:04 PM »

hello,

- for simple 'panel' radiators if the room has a temperature of 20C the figures below give the relative output compared to a radiator with a entry temperature temperature of 80C

0.798@70C, 0.605@60C, 0.423@50C, 0.256@40C, 0.108@30C
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rogeriko
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« Reply #6 on: February 12, 2018, 10:01:44 PM »


Is there any info about this anywhere, test's etc? I run my stelrads at 50 deg C flow temperature, and they give out heat wonderfully...

What would be the cut off temperature, below which the radiators won't convect..


hello,

- for simple 'panel' radiators if the room has a temperature of 20C the figures below give the relative output compared to a radiator with a entry temperature temperature of 80C

0.798@70C, 0.605@60C, 0.423@50C, 0.256@40C, 0.108@30C


Thats what I said at 30 degrees centigrade a 3kw radiator gives out only 300 watts or 1 tenth of the design ratings.
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linesrg
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« Reply #7 on: February 13, 2018, 04:20:58 AM »

Good Morning All (from Doha airport),

My assortment of K2 and K3 Stelrads have worked well enough so far since we installed our heat pump.

The temperature going out from the heat pump has been in the range 35 - 42 degrees C. There is still work to be done on improving the house with the Hall, Living Room and downstairs bathroom to be ripped out with the attendant radiators being replaced with UFH.

When I get back I have to complete removing the old cold water header tank from the attic and putting another 100mm layer of fibreglass in that part of the roof.

Step by step.........

Regards

Richard
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16 x BP380 on a Lorentz tracker/ SMA SB2500, 16 x Chinese 80W/ SMA SB1700, 16 x BP380/ SMA SB2500. CTC GSi12 heat pump/ Gledhill ASL0085 300litre EHS/ 3off Navitron 4720AL solar ET panels and an Immersun T1060/ T1070/ T1090. 7 x Tianwei 235W/ SMA SB1700/ Growatt SP2000.
DonL
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« Reply #8 on: February 13, 2018, 01:43:08 PM »

I too used conventional panel radiators with size adjusted according to the de-rating factors already given. It's surprising how much more surface you can get into the same area by specifying  doubling up or tripling panels, adding more fins etc. Panel radiators without moving parts are simple, extremely quiet, and inexpensive. I've been fully satisfied using them with my ASHP.
Obviously you have to size them properly for the design temperature using the de-rating factors.
Don
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