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02-12-2008, 16:24   #16
record
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Quote:
Originally Posted by gunner0098 View Post
Hey Mossy.

And here I was sweatting over my bill (which is still inducing bouts of anger!!).

Can I ask what your next step is with this?

Cheers

gunner0098
Just to get an update - have your ESB bills come down since you posted on this topic? I'm interested as I am currently having similar problems.

Many thanks.
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02-12-2008, 17:01   #17
record
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Heat Pumps - post here.

I have read many threads here on the running costs of heatpumps. A common theme seems to be very high (and unexpected) running costs when people start to use them.

I am just wondering if anyone has managed to bring down the running costs of their heatpump and, if so, how?

(I am having similar problems myself with my own heatpump).

Thanks in advance for any replies.
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03-12-2008, 00:43   #18
 
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Sorry I cant offer a direct reponse - I don't have a heat pump - would you mind taking part in this please ?

http://www.boards.ie/vbulletin/showt...p?t=2055263818
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03-12-2008, 00:54   #19
 
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A lot of energy is consumed by domestic hot water . You may be overheating it .

If your water is nice and hot whilst showering and you neeed to mix cold - try turning your cylinder stat down

Try increasing the thickness of insulation on your cylider and increasing the insulation of your primary pipework ( which runs between the cylinder and heat pump )

Do you have dual tarriff metring ? To take advantage of night rate ? Try moving the power on period more into the night time zone

Not heat pump related ....

unplug all appliances where this is practical ( or turn off switches if your power points have switches )

only fill ketttle with 2/3 cupfulls if thats all your going to use

only charge your phone for the 40/50mins rerquired -never overnight

replace most / all lighting with low energy
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03-12-2008, 09:20   #20
 
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Heat Pumps - post here.

Folks,

Is it fair to say that anyone with an air to water heat pump has been paying up to €0.19 per kWh for the last week to heat their home?

Is there anybody out there that has a unit installed for over a year now? What are your experiences?

I am finding it difficult to get proper independent COP figures for air to water units.
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03-12-2008, 11:36   #21
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Heat Pumps - post here.

Hi Lads and Lassies,

I have a few questions to throw out there regarding the working/performance of Geothermal Heatpumps.

These days i find that the heatpump is running alot - both at night time (mostly) and during the day (quiet a bit too).
One thing that is bugging me is that even though there is no demand (all stats are off and the cylinder is heated), its still running clocking up the units. I quizzed the installer about this last year and he told me that once the outside temp hits < 3 degrees, the heat pump will be running most of the time.
Is he right on this???
What is bugging me is that even though there is no demand on it - its still running.

My second question is regarding some of the Brine out/in temperature readings on it.
I kept an eye on it during the summer months and the Brine out/in temp was reading 7/11 degrees.
I checked this again last night and the readings were 3/7 degrees.
I didnt think that the ground temperature would show that much of a difference.
Is there anyone else out there seeing similar readings?

Regarding the performance of my heatpump - i installed a seperate meter on my heatpump this year (April 7th 2008).
Last night it hit 3000 units.
Considering that the majority of these units used were at a night rate of 6.5 cents, if they average say at 10 cents a unit (max), to date then my heat pump running costs since the meter was installed is around 300 euro excluding VAT and standing charges..

How does that compare to other users out there?

Thanks folks.
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03-12-2008, 18:21   #22
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Heat Pumps - post here.

This is an ongoing topic so What I am going to do is make one thread and merge the others with this. A couple of the posts will now be jumbled up a wee bit but you can blame smashey and Mellor for that.

This will tidy up the sub forum a bit and i will sticky this to ensure that its staring at you as soon as you hit the front page.
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10-12-2008, 12:59   #23
rathbaner
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I've been running a GS heat pump in a three bed detached house for about five years now. The heat delivery is underfloor.

I use no gas or oil. I have a solid fuel range, mainly ornamental though we occasionally cook a roast in it and will probably do the Xmas roast in it. We also keep a small traditional open (to the sky) fire in the living room, again ornamental in the main.

Part of the house is a traditional cottage using rubble filled stone walls. So they're very porous - and can on occasion be draughty in strong easterlies. The insulation in the roof space, under the floors and in the modern external walls is to a fairly high standard.

We have three kids at school so the washing machine is going throughout out the week - the tumble dryer less so though it gets plenty of use. We cook on an electric stove, microwave etc. The front door to the house is open to the garden most days when the kids are not at school. Otherwise the half door is open to keep the dog from lounging around indoors.
My wife works from home so the heat's on all day every day. She uses a computer and printer.

So apart from the nice wood fire in the TV room in winter and the occasional range slow-cooked roast diiner, the ESB supplies all my energy. My ESB bill has settled at around €2k pa. We use a night meter but the thermostats are generally reprogrammed only about two or three times a year. It's not unheard of to open the velux windows in the roof in spring to cool the place or to sit in the kitchen at dinner in winter with the door open so I'm sure I could do better.

It's because the house itself is the radiator, the comfort of the place is seductive. There's no shouting at the kids to close to door or hunting around for draughts, though on occasion the east wind can blow down the chimney or through the walls, but that's not frequent.

And we never run out of oil on a Sunday afternoon in February.

Last edited by rathbaner; 10-12-2008 at 13:04.
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10-12-2008, 13:28   #24
slayer91
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Somethings to consider about excessive ESB bills with heats pumps.

1. The unit cost of electricity when I installed my heat pump in late 2005 was 12.2c per KWH for day rate and 5.42c per Kwh for night rate. The current costs are 18c and 8.8c respectively. That is a huge increase over time.

2. This winter has been by far, the coldest of the last 3 winters, so the heat pump is running longer to keep the internal temps the same.

3. The most important figure in dealing with heatpumps is the CoP (Co efficent of Performance). The higher the better. If your Cop is 4.5 then for every unit of electrical energy (running the compressor in the heat pump) used by the HP, it returns 4.5 units of heat. All CoP are effected by ambient temp, the lower it goes the lower the CoP goes. Therefore the HP runs longer to give the same heat. Most suppliers quote their system CoP for 8 deg C. Air source HP in particular are effected by this.

I used my air sourced HP to supply all heating (u/f downstairs and rads upstair), domestic hotwater for 2 showers and taps.
In all, the total annual ESB costs for all usage including general usage in 2007 was €2400. I expect this figure to be exceeded for 2008 for the reasons outlined. House is 2500sq ft. Insulation could be improved.

Regs
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10-12-2008, 13:43   #25
hiscan
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on the subject of high esb bills,got one last month for 495 euro the only problem is we dont have any underfloor heating but i did install one of hose dual meters,my question is do i need the day/night meter when i dont have underfloor heating a mate reckons your eletricity is dearer this way
the only pumps i have is one in the garage where all my heating is eg. boiler,water tanks i also have a well on site and theres a pump down there plus one of the new septic tanks
would any of these three pumps justify an esb bill 0f 495 euro?
would there be such a thing as a faulty esb meter
apologies if this is in the wrong place feel free to move it
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10-12-2008, 13:59   #26
rathbaner
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Quote:
Originally Posted by hiscan View Post
on the subject of high esb bills,got one last month for 495 euro the only problem is we dont have any underfloor heating but i did install one of hose dual meters,my question is do i need the day/night meter when i dont have underfloor heating a mate reckons your eletricity is dearer this way
the only pumps i have is one in the garage where all my heating is eg. boiler,water tanks i also have a well on site and theres a pump down there plus one of the new septic tanks
would any of these three pumps justify an esb bill 0f 495 euro?
would there be such a thing as a faulty esb meter
apologies if this is in the wrong place feel free to move it
Are you sure there isn't an "E" beside the current meter reading? I have got really scary bills in the past too. But they were wildly inaccurate estimated readings on the ESB's part.
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10-12-2008, 14:13   #27
hiscan
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Quote:
Originally Posted by rathbaner View Post
Are you sure there isn't an "E" beside the current meter reading? I have got really scary bills in the past too. But they were wildly inaccurate estimated readings on the ESB's part.
i wish there was but unfortunately it's an actual reading
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12-12-2008, 14:31   #28
dryan
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Heatpump performance question

Regarding the performance of the heatpumps (Horiz GS), can people tell me the temperature values of the brine in/out readings? How is this cold spell affecting the heat pump performances?

Thanks
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15-12-2008, 22:22   #29
 
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This cold snap started about two weeks ago, on a Sunday as I recall.
I noticed that it coincided with our heat pump just running and running. Up until then it had been acheiving 34 degree UFH temperatures no problem. Overnight it seemed to begin to struggle to acheive 26 degrees.

Only then did I look for a figure for brine temp. From the analog dials I am reading it seems to be at 0 and -2 (in and out)! Note to get an accurate reading for these, I understand the unit has to be RUNNING.

If anybody knows :
- how to get digital data for brine temps from an ochsner heat pump I would be obliged. The installer or manufacturer still has not told me.
- what effect these low brine temperatures have on heat pump COP.

In reply to dryan, the heat pump running even when there is no demand. It may be possible to prevent this by turning the heat pump setback temperature down to something like 15 degrees. Its trying to keep the water at a certain temperature hence it kicks in regardless of demand from the rooms.
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15-12-2008, 23:55   #30
merlynthewizard
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How cheap are they to run? and are they green since we get out power from fossil fuels?
What kind of figures are we talking to get one done?
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