ᐅ Heat load calculation is 10.3 kW; is an air-to-water heat pump with 9.5 kW capacity sufficient?

Created on: 5 Mar 2020 22:09

Hello everyone,

I just had a brief phone call with our heating engineer. The heating load calculation resulted in a value of 10.3 kW. He would recommend a 9.5 kW air-to-water heat pump (nothing else is possible since drilling, etc., is not allowed), among other reasons because it is eligible for funding through BAFA.

My question now is whether this air-to-water heat pump is adequately sized. In the open-plan living room, we also have a wood stove.

I hope someone here can clarify this for me.

Thank you very much!

Best regards,
Hannes

Daniel-Sp6 Mar 2020 09:20

#13

You can find the lower modulation range in the datasheet. It should specify the modulation range for different operating points. The lower limit at A7 (7°C (45°F) outdoor temperature) is particularly relevant. This allows you to estimate how well the heat pump performs during the transition periods. At A-7 (-7°C (19°F)) outdoor temperature, you can assess whether the heating capacity is sufficient for winter or if the electric heating element will need to activate early.

Also, review the heating load calculation carefully. What indoor temperature was assumed, and does it match your preferences? Was a room-by-room heating load calculation performed using the specific parameters of your house?

hippjoha6 Mar 2020 09:31

#14

Many thanks first of all for your quick help and responses. This is already very helpful for my next conversation with our heating engineer. As soon as I have more detailed information, I will get back to you.

T_im_Norden6 Mar 2020 10:28

#15

It starts at 2.6 and could work since it is modulating.

Zaba126 Mar 2020 10:57

#16

I also find the 10kW heat pump oversized for the square meters, but since you’re paying a professional, they should know what they’re doing.

Daniel-Sp6 Mar 2020 11:08

#17

Zaba12 schrieb:

I also find the 10kW heat pump oversized for the square meters, but you are paying the expert, so they should know what they are doing.

I wouldn’t trust the expert blindly when it comes to heat pumps...

hippjoha20 Mar 2020 12:18

#18

So, I just received a report for the annual performance factor calculation. If I’m reading it correctly, it has a "nominal" capacity of only 8.1 kW (17.8 kBTU/h).

Coefficient of Performance (COP) (A-7/W35 / A2/W35 / A7/W35): 3.3 / 4.31 / 5.12
Nominal output in kW (A7 / W35): 8.1 (17.8 kBTU/h)

Overall annual performance factor: 4.61

ᐅ Heat load calculation is 10.3 kW; is an air-to-water heat pump with 9.5 kW capacity sufficient?

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