Estimating Heat Pump Output (BTU/h)
My centrally-ducted heat pump is a variable-speed Bryant 284ANV048. This brand is marketed in the U.S. and is made by Carrier. It has a fancy thermostat with a screen called "Equipment operating status". This screen reports something called "HP var", which is reported as a percent, and can vary between approximately 30% and 100%. My question: is there a way to estimate the heat output in BTU/h from this HP var parameter? Note that I have the heating capacity curves for the heat pump.
thanks,
Neil
Hi Neil,
I presume that you live in the USA and have what we in the UK would call an Air to Air (A2A) heating system, in that when in heating mode it takes thermal energy from the outside air and uses this thermal energy to heat the indoor air.
I assume that the HP Var is an indication of how fast the heat pump compressor is operating, which often indicates how hard it is working. I doubt that you would be able to ascertain the actual thermal energy output from the HP Var value either in BTU's or kW's, since this will vary with the size of the heat pump and the operating conditions.
I would suggest that you contact the manufacturer and ask if there is a way to obtain the information that you seek.
Thanks Derek. Note I do have the capacity vs. temp curve for the heat pump. I have not had much luck with the manufacturer. Here, the manufacturers seem always to direct you to the local contractors/installers -- who are very polite but not of any help. I wish they were rude and useful!
The majority of heat pumps in the UK are Air to Water (A2W), which makes quantifying the thermal energy output easier by installing a thermal energy output meter. In basic terms it measures the water flow rate passing through the heat pump, measures the temperature of the water going into the heat pump and the temperature of the water coming out of the heat pump. It is therefore only a matter of determining the temperature increase of the water and the flow rate and applying the Specific Heating Capacity for water.
In theory it should be possible to do the same with an A2A heat pump, provided that you can measure the air flow rate and In and Out temperatures with a sufficient degree of accuracy.
I would be interested to see the capacity vs. temp curve that you mention.
@derek-m Derek, the capacity curve is in the product data manual, which you can find by Googling "bryant 284anv product data"
- 26 Forums
- 2,242 Topics
- 49.9 K Posts
- 281 Online
- 5,903 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: My experience with 3 heat pump surveys: Heat Geek, British Gas & Octopus
Precisely my view and why I use the term 'sense check'....
By JamesPa , 6 hours ago
-
RE: RDSAP10 effect on existing heat pump EPC rating?
@judith This is very interesting. I've located and prin...
By Mike Patrick , 6 hours ago
-
RE: Daikin Octopus installation update - I saw my first defrost. 😍😂
@radwhisperer Thanks but that is definitely not a mixer...
By Jancold , 9 hours ago
-
-
RE: Octopus Cosy Heat Pump Owners & Discussion Thread
OK thats cheap, the commercial price seems to be £400 p...
By JamesPa , 14 hours ago
-
RE: Solar inverters - where does the energy go when clipping?
I think I must query the sources on which Greenmatch ha...
By Transparent , 17 hours ago
-
RE: Replacing knackered oil boiler with Samsung ASHP - Perthshire
This is how I run my Samsung 12kW ASHP with a 3rd party...
By Old_Scientist , 19 hours ago
-
RE: Testing new controls/monitoring for Midea Clone ASHP
@cathoderay thanks- yes will keep an eye out for the de...
By benson , 1 day ago
-
RE: Renewables & Heat Pumps in the News
Hoping so as well! I am no specialist. The language use...
By Batpred , 1 day ago
-
Do you need the DHW tank as high as 50°C @egp01 ? Ha...
By Transparent , 1 day ago
-
RE: The Hidden Secret to a Successful Heat Pump: Pipe Size Matters
@old_scientist Just to say that during our retrofit, we...
By Toodles , 1 day ago
-
RE: Daikin Altherma 3M ASHP and British Gas Hive Home
We have a Daikin EDLA08 8kW monobloc (DHW is handled se...
By Toodles , 1 day ago
-
@old_scientist @jamespa So this was last nights DHW r...
By bontwoody , 2 days ago
-
-
@springswood we install these nationwide and I have the...
By dgclimatecontrol , 2 days ago
-
RE: DESNZ doing a survey which asks the right questions!
Fair comment. I have a feeling that ratings more gen...
By JamesPa , 2 days ago
-
Thanks! My consumer unit collection is ready with the W...
By Batpred , 2 days ago
-
RE: Designing my house system with a mix of air to air and air to water
@jamespa Cheers James, it's great reading. In quite a f...
By pipebaron , 2 days ago
-
RE: PV Panels on roof in Conservation Area
If there is any way you can determine daily oil consump...
By JamesPa , 2 days ago
-
RE: Grant 13kW Aerona3 - issues getting zones to temp
attached is prelagged in case indicates anything. &nb...
By Crimson , 2 days ago



