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564 posts

Ultimate Geek


  # 1786264 22-May-2017 21:54
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Regarding the dehumidifier function on heat pumps, it is pretty useless in winter.

Heatpumps have one coil inside, and one outside.

When heating they move heat from the outside coil to the inside coil (warming the house).

When cooling they move heat from the inside coil to the outside coil (cooling the house)

Dehumidify mode works the same as cooling (uses the cold inside coil to condense water from the air) except it is designed to avoid "excessive cooling" (uses very low fan speeds, and some other trick).

Result is that a heat pump in dehumidify mode will use power, dry you house, but cool it down. (perhaps some units alternate between heat and cool? - if so, sounds very wasteful in terms of power)

 



You would be much better off with a stand alone dedicated dehumidifier with a humidistat so it doesn't dry the house too much (particularly if you can run a drain line so you don't have to empty the tank).

A stand alone (refrigerant) dehumidifier works the same as a heat pump, but both coils are inside. It passes the air through the cold coil (causing water from the air to condense and drain away), then passes the air through the hot coil. Air will leave the dehumidifier slightly warmer than it went in (heated by the electricity input and by the energy release from the "latent heat of vaporization" of the condensed water).

Net result is that your house is dried, and slightly heated.


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  # 1786265 22-May-2017 21:59
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Scott3:

 


Net result is that your house is dried, and slightly heated.

 

 

Yet people will go on about them being so expensive to run, which is something I dont understand when they are quite happily running a resistive heater to warm the place up.





Richard rich.ms

 
 
 
 


neb

1110 posts

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  # 1786267 22-May-2017 22:03
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blakamin:

I know they recognise Panasonic, and all controls are able to be used except the timer (which would defeat the purpose anyway... If you want to use the timer, use the timer on the remote).

 

 

I've got a Mitsubishi, which are notoriously hard to get a third-party remote for because you need to send enormously long control words that haven't (or hadn't, the last time I checked) been fully reverse-engineered yet. A quick Google hasn't found any definite confirmation that the Broadlink works with Mitsubishi heatpumps, They advertise "200 brands" and "300 appliances" but don't actually tell you what any of them are... the RM Mini, which is all you need, is only USD 16 but I'm not sure I want to potentially create another piece of e-waste just to see if it works.



2712 posts

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  # 1786280 22-May-2017 23:07
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Scott3:

 

Regarding the dehumidifier function on heat pumps, it is pretty useless in winter.

Heatpumps have one coil inside, and one outside.

When heating they move heat from the outside coil to the inside coil (warming the house).

When cooling they move heat from the inside coil to the outside coil (cooling the house)

Dehumidify mode works the same as cooling (uses the cold inside coil to condense water from the air) except it is designed to avoid "excessive cooling" (uses very low fan speeds, and some other trick).

Result is that a heat pump in dehumidify mode will use power, dry you house, but cool it down. (perhaps some units alternate between heat and cool? - if so, sounds very wasteful in terms of power)

 

 

Thanks. I realised this afternoon myself after reading about how the dehumidify function works on a heat pump. Appears to just cycle between cold and hot to keep the temperature constant. As you said, sounds very inefficient, so will likely give that a miss.

 

Might need to look at some sort of proper HRV style system for that.




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Uber Geek


  # 1786292 22-May-2017 23:15
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For those interested, I managed to get my "dumb" heat pump working with my Logitech hub based remote.

 

As mentioned earlier in the thread by @jnimmo in order to schedule it you need to set each mode as a separate activity, which is a bit clunky but works.

 

It also gives control over the internet, which could come in handy.

 

Biggest downside is that it is not bi-directional communication, so you are just sending the commands blind without knowing what the heat pump is currently doing.


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  # 1786319 23-May-2017 06:49
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neb: How versatile are these across different heat pumps? Some of them (like mine) don't have simple "On"/"Off"/"Temp up 1" style commands but send multi-hundred-bit command words that reprogram the entire heat pump every time you press a button on the remote. I ended up getting an IndieGoGo'd one that was known to work because at the time I checked it wasn't clear whether any generic IR-remote device would be able to deal with it.

 

Works fine with my Daikin and Fujitsu. I think all heat pumps send entire state information with each command, not just up/down/off.




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Uber Geek


  # 1786472 23-May-2017 09:54
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timmmay:

 

neb: How versatile are these across different heat pumps? Some of them (like mine) don't have simple "On"/"Off"/"Temp up 1" style commands but send multi-hundred-bit command words that reprogram the entire heat pump every time you press a button on the remote. I ended up getting an IndieGoGo'd one that was known to work because at the time I checked it wasn't clear whether any generic IR-remote device would be able to deal with it.

 

Works fine with my Daikin and Fujitsu. I think all heat pumps send entire state information with each command, not just up/down/off.

 

 

You can send "off" as a state though.


 
 
 
 


588 posts

Ultimate Geek
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  # 1786477 23-May-2017 10:03
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neb:
blakamin:

 

I know they recognise Panasonic, and all controls are able to be used except the timer (which would defeat the purpose anyway... If you want to use the timer, use the timer on the remote).

 

I've got a Mitsubishi, which are notoriously hard to get a third-party remote for because you need to send enormously long control words that haven't (or hadn't, the last time I checked) been fully reverse-engineered yet. A quick Google hasn't found any definite confirmation that the Broadlink works with Mitsubishi heatpumps, They advertise "200 brands" and "300 appliances" but don't actually tell you what any of them are... the RM Mini, which is all you need, is only USD 16 but I'm not sure I want to potentially create another piece of e-waste just to see if it works.

 

+1 I would also be interested in confirmation whether the RM Mini would work with Mitsubishi heatpumps...


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  # 1787006 23-May-2017 19:26
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hairy1: There is a timer option in the app for the broadlink. I use it so I can set the Panasonic heat pump on during weekdays only. Works brilliantly.

 

 

 

Good point. I was only meaning the timer on the panasonic. I use the broadlink timer to turn my lamps on and off. :D


neb

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  # 1787139 23-May-2017 23:09
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neb: I ended up getting an IndieGoGo'd one that was known to work because at the time I checked it wasn't clear whether any generic IR-remote device would be able to deal with it.

 

 

Mine has just shipped, I'll report on functionality once it arrives. The only downside is that it's rather more expensive than the Broadlink one.

 

 

Another reason for going with the Indiegogo one is that there's at least some reassurance that it's not sending your usage data to various servers in China or opening up ports to the whole world and other, similar issues that have been found in any number of Chinese IoT devices. So I don't really mind paying a bit more to know that my internal network hasn't just had an attack vector for hackers added to it.

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  # 1787195 24-May-2017 06:56
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Chinese ones usually have you set a region on setup since connectivity to China is so crap. I frequently have timeouts on my mi gear when set to China but Singapore works great. Also the Alexa support only works on Singapore since the cloud to cloud is terrible out of China.

Problem is half the items are not supported on the Singapore cloud and it's a whole account setting.




Richard rich.ms

267 posts

Ultimate Geek

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  # 1787257 24-May-2017 09:03
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richms: Chinese ones usually have you set a region on setup since connectivity to China is so crap. I frequently have timeouts on my mi gear when set to China but Singapore works great. Also the Alexa support only works on Singapore since the cloud to cloud is terrible out of China.

Problem is half the items are not supported on the Singapore cloud and it's a whole account setting.

 

 

 

Yes I have a Xiaomi MI and wifi sockets that I can't use at all.  They only show a peep of life when I use the China web site on the app, but then if defaults to Chinese. ARGH !!!

 

Have ordered a Broadlink Universal WIFI / IR Remote Controller to try.

 

 





:)


1670 posts

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  # 1787314 24-May-2017 10:34
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Do the Xiaomi sockets work with the Mi Home gateway (via Zigbee)?


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  # 1787326 24-May-2017 10:53
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There are 2 mi sockets - wifi and zigbee.

 

I have some of each, the zigbee I tried pairing with my smart things hub, but they seem to break the network since they operate as a repeater sort of, so if I powercycle my wemo lamps they will lose connection.

 

Not tried paired to the mi hub yet, as I dont really have too much of a use for them right now.





Richard rich.ms

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  # 1787340 24-May-2017 10:56
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Thanks @richms - the reason I ask is you can set the gateway in *developer* mode and then put it on a closed off VLAN so there is no external connection necessary. Then there are a few python scripts which allow you to connect to the gateway and translate the status updates and commands into MQTT or HTTP requests. Makes for a very nice, local-only, set of sensors. If the sockets worked the same way with the gateway, then it would be great.


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