Inverter type A/C unit supplied by Vaughan Williams

TopGun


Joined: 04/03/2009
Posts: 29

Message Posted:
28/07/2011 11:56

Inverter type A/C unit from Vaughan Williams, excellent service for a job completed quickly with no fuss.



With visitors over during this hot spell, we decided to fit an a/c unit in the spare bedroom. The best option was to replace the unit in the master bedroom with an inverter type. Then refit the removed unit into the spare bedroom.



Vaughan carried out an inspection on the Thursday and the a/c units were up and running on the Saturday. Work carried out as requested with minimal fuss and to a very good standard. The new inverter unit is so quiet. Vaughan even followed up with an inspection on Sunday to ensure all was working OK.



Credit where credit is due, thank you to Vaughan and his team.



Shaun

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
28/07/2011 15:35

Thank you Shaun,



It's rewarding when a job goes well and we have another satisfied customer.



With the cost of electricity in TRNC only going up in price, inverters are the only way to go.

IbrahimAbi


Joined: 24/10/2010
Posts: 245

Message Posted:
28/07/2011 18:23

What is an inverter a/c? Does it work from a dc supply?

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
29/07/2011 07:24

No, It works from normal ac house supply. I will post a link which explains fully. If you live here and use a/c a lot, I urge you to buy inverter a/c as the running costs can be up to 1/3rd.

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
29/07/2011 10:57

http://en.wikipedia.org/wiki/Inverter_(air_conditioning)



Inverter-based air conditioners have their strengths in environments where a partial load is common, as they are significantly more efficient than conventional air conditioners in those situations. For conventional households where each indoor unit is connected to a single dedicated outdoor unit, inverters are the preferred option, as partial loading is the common mode there. The higher initial expense is balanced by lower energy bills.

beachsidebum


Joined: 02/03/2010
Posts: 425

Message Posted:
29/07/2011 11:13

Hi Vaughan, can you give me price for a 24000 btu unit installed.

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
29/07/2011 11:23

24000Btu

Non inverter 990 US$

Inverter 1,220 US$

subject to survey.

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
29/07/2011 12:16

Given the savings in running cost, the extra 230 US$ difference will be payed back within 2 to 3 years. After that, the units will start to pay for themselves.

IbrahimAbi


Joined: 24/10/2010
Posts: 245

Message Posted:
29/07/2011 12:28

Thanks Vaughan, very interesting

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
29/07/2011 13:54

Other benefits of inverter a/c.



1. Much longer compressor life due to "soft" starts.

2. Low start current means generators can handle them.

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
29/07/2011 15:08

Some other advantages of inverter driven a/c:



Soft start extends compressor lifespan.

Soft start allows smaller generators to handle them, unlike non-inverter.

teatime


Joined: 20/10/2008
Posts: 852

Message Posted:
29/07/2011 17:36

Msg 7. Are those prices supply only or supply and fit?

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
30/07/2011 06:27

supplied and fitted. subject to survey.

Groucho



Joined: 26/04/2008
Posts: 7993

Message Posted:
30/07/2011 07:28

"Running at full load, a compressor delivers its best efficiency and outperform inverters. Inverter-based air conditioners have their strengths in environments where a partial load is common, as they are significantly more efficient than conventional air conditioners in those situations. " From the link you gave...



I don't see much evidence of 'partial load' in this heat, so they won't save much in the really hot weather... or am I misreading this?

erolz


Joined: 17/11/2008
Posts: 3456

Message Posted:
30/07/2011 08:22

Groucho I am no expert but I did replace an old non inverter aircon uinit last year with an inverter one (not from TRNCVaughan btw) and as far as I can tell it is costing less to run, even in the full heat this summer. I think the point is it only runs at full load for a relatively short period of time to intialy bring the temp down, and then actualy just runs at very low levels after that to just keep it 'topped up', rather than the old one that would run full, stop, run full, stop continuously. So if I am sitting in my room for say 6 hours I guestimate it runs full load for a mere fraction of that time even in the kind of heat we have at the moment. I might be wrong, its all unscientific subjective assumption on my part, but thats what it seems to do.

martinD41


Joined: 06/09/2010
Posts: 3001

Message Posted:
30/07/2011 14:19

I would think that given the fact that most houses here are of solid wall/roof construction,and consequently act as storage heaters especially in these temperatures,which ever you choose, Inverter or conventional,the unit will be working at max power and so the difference between the two types is minimal.......If houses here were build to incorporate even minimal "Thermal" efficiency,then the difference would ,I am sure become more apparent........

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
31/07/2011 06:56

Erolz has captured the essence of an inverter driven a/c unit.

It is essential that a/c units are correctly sized. If they are undersized there will be a tendency for them to run at 100% with no opportunity to run at partial load.

I am quite happy to carry out a free, no-obligation survey and quote to customers.

Alternatively, you can let me have details on vaughan@sunnycyprus.net and I will reply with the calculated load.

martinD41


Joined: 06/09/2010
Posts: 3001

Message Posted:
31/07/2011 10:25

How do you factor in the degree of "Heat Sink" ...Air con in a typical Cypriot built",Uninsulated" house, is akin to attempting to "Cool the Great Outdoors".. Which ever you choose, Conventional or Inverter,unless your house is FULLY insulated the efficiency of either would be highly compromised....Inverters are way more expensive and the benefits in terms of reduced electricity bills (in uninsulated Houses) would be negligible ,as they would rarely achieve optimum performance...

TRNCVaughan


Joined: 27/04/2008
Posts: 4578

Message Posted:
01/08/2011 09:00

I factor it in when I do my load calculation. This leads to specifying a larger unit than might be used in an energy efficient building, but it is easier and cheaper to oversize the a/c than insulate the building after the event.

The benefits in reduced electricity bills are there to be seen when we replace a non-inverter unit with an inverter driven unit, in the reduction in the size of the monthly electricity bills.