Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
2

what is typical COP of entire heat pump & heater system for humid climates ?

asked 2017-03-15 14:21:59 -0500

amirrezaheydari gravatar image

updated 2017-03-31 15:48:32 -0500

Using a heat pump for a humid climate like sydney, the air temperature should be lowered below it's dew point , then it should be increased into desired comfort temperature. what is the typical COP of such systems? ( not COP of heat pump alone, I mean the COP of total system including the heater).

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted
3

answered 2017-03-15 15:15:17 -0500

There are multiple ways to do this and of course multiple answers to your question. You could use a heat pump that uses waste heat to reheat the air, or use electric resistance to heat the air. Or you could use a desiccant system to remove additional moisture or add heat pipes to the coil to change the SHR. So to answer your question it would take specific information on your application. If a heat pump is used to condition the air to a thermostat set point and that heat pump operates at a 3-4 COP, then using over-cooling to dehumidify the air will lower the COP to 2-3 if electric reheat is used (i.e., you'll probably take a 25% - 30% hit on efficiency). If waste heat is used then the COP would be somewhere in between these values (2.5 - 3.5). These are simply rough guesses at this point without more information.

To do the design calculation you would use COP = ( kWcoolingcapacity - kWreheatcapacity ) / ( kWcoolingpower + kWreheatpower ) to ballpark your efficiency.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

 

Question Tools

Stats

Asked: 2017-03-15 14:21:59 -0500

Seen: 34 times

Last updated: Mar 15