Home » 2012 » December (Page 2)

Monthly Archives: December 2012

Central Heating Radiator Sizing

Radiators are often not correctly sized for the room size or intended use. It is important to correctly size radiators for the size of room to be heated and environmental conditions. Rooms with large windows, north facing [in northern hemisphere] and south facing [in southern hemisphere] take more energy to maintain at a comfortable temperature. Radiator sizing also needs to take account of ceiling height. As heat rises a larger radiator size is needed for higher ceilings.

Always check manufacturers data for heat output, stated in BTU/Watt values. Note bathroom towel rail type radiators are generally not suitable to heat a bathroom. Be sure to calculate room heating requirements when choosing a towel radiator.

Chrome towel radiator. Check heat output Watt/BTU if you want this radiator to also heat your bathroom.

The table below details the correct values for different types of rooms and locations. The values are based on 1m³. You can multiply the table values by the volume of your room [length x width x height] to see what you need. Manufacturers and Retailers can give details of Watts/BTU values for each radiator size and type.

Per m³ lounge, sitting room, study, games room, dressing room, dining room bedrooms, bathrooms and shower rooms common areas, halls, landings and kitchens
Approximate heat loss value Approximate heat loss value Approximate heat loss value
Room type Watts BTU Watts BTU Watts BTU
standard room, where non of the factors below apply 51 174 41 140 31 106
north facing room 59 200 47 161 36 122
very large windows or french windows 61 209 49 168 37 127
double glazed 46 157 37 126 28 95
very large double glazed or french windows 56 191 45 154 34 116
north facing with double glazing 54 183 43 147 33 111
north facing* with large windows or french windows 69 235 55 189 42 143
north facing room with very large double glazed windows or french windows 64 218 51 175 39 132

* North facing in northern hemisphere and south facing in southern hemisphere. This is because the exterior structure of the building is in permanent shade. This could also apply to buildings in close proximity to each other. It may also be the case that exterior walls are in permanent shade.

When adding a new radiator to an existing system it is important to check the radiator sizes of all existing radiators. The heat output capacity of your boiler needs to be checked to confirm the additional radiator[s] will work efficiently.

Advertisements

Central Heating Radiator Types [Type 11 Type 21 Type 22]

Radiators are available in three main types, detailed as follows:

Type 11 Single panel, single convector. The first digit indicates 1 panel, second digit 1 convector [ridged metal fins on back of radiator]

Type 11 radiator, single panel single convector

Type 21 Double panel, single convector. The first digit indicates 2 panels, second digit 1 convector [ridged metal fins in middle of radiator, between panels]

Type 22 Double panel, double convector. The first digit indicates 2 panels, second digit 2 convectors [ridged metal fins in middle of radiator, between panels]

Always check the manufacturers heat uotput data for each radiator you want to install.

Please contact me if you need any further help with choosing radiators for your property.

Is Your Gas Boiler Costing Too Much to Run?

Is Your Gas Boiler Costing Too Much to Run?

This post is put together to help you identify if your central heating/hot water gas boiler is consuming too much gas. You do not need any specific skills other than being able to record gas meter values and work with the values shown on your gas bill.

All work on gas appliances must be undertaken by a competent person registered with Gas Safe. The following link will help you confirm the competency of anyone undertaking gas appliance work at your property.

http://www.gassaferegister.co.uk/

Get to Know Your Gas Meter

Measurement is management. The biggest part of energy efficiency is knowing how much energy is being used. Your gas meter may be either imperial or metric. A metric meter has m3 next to the number counter.

A metric meter displays gas consumed in m³. The following shows the changes in reading for consumption of 1.5 m³.

0000000

0000150

If your gas meter is imperial [not showing m3 next to the number counter; the following factor can convert cubic feet cubic meters.

100 ft³ = 2.831684659 2 m³

The following link gives details for all heating and hot water boilers

http://www.sedbuk.com/

Detailed below are the published values for two Alpha boilers.

Boiler Heat input Heat output Gas Flow
Alpha CB24 12.1 to 28.4 kW 9.3 to 23.3 kW 1.16 to 2.71 m³/h
Alpha CB28 14.3 to 34.0 kW 11.2 to 28.0 kW 1.37 to 3.25 m³/h

This section contains the calculations to convert the published values into cash terms.

Calorific value (CV) is a measurement of the amount of energy contained in gas. CV is usually quoted in mega joules per cubic metre (MJ/m³). Gas has a CV of between 37.5 MJ/m3 and 43.0 MJ/m3.

One cubic meter (1 m³) of gas is equivalent to 11.06kWh.

From the above table it can be estimated the CB24 boiler will consume between 12.83 kW to 29.97 kW

If we base the calculation on a gas price of 5 pence per kWh the CB24 boiler will cost as follows:

Published consumption value x 11.06 x cost of gas (per 1m³)

For the CB24 the calculation is

The minimum gas flow rate calculation is 1.16 x 11.06 x 0.05 = £0.64

The maximum gas flow rate calculation is 2.71 x 11.06 x 0.05 = £1.50

You can use the above calculation, adjusted to the published values contained in your boiler manual. To identify how much your boiler costs to run.

Step 2 Compare Gas Bill to Calculated Data

You can check your gas bill total against the calculated data in the following ways:

Central Heating/Hot Water Timer Control Fitted

  1. Check details for your heating/hot water timer and note total daily hours of operation
  2. Multiply daily values by the time period on your bill.

Central Heating/Hot Water Timer Control NOT Fitted

  1. Divide bill total (minus any standing charges) by the number of days in the time period of the bill.
  2. Divide the daily total by the approximate number of hours of operation per day.

It would be more energy efficient to fit time/temperature control equipment. If not you could note approximate times of operation to compare published consumption data against the cost of your gas bill.

There are many variable conditions that affect boiler performance. A summary is listed below:

  1. System type [Combi, sealed system, open vented]
  2. Size of boiler & central heating system
  3. Age of boiler & central heating system
  4. Ambient temperature
  5. Thermal efficiency of the space being heated. A cold drafty house will cost much more to heat.
  6. Time of operation per day [timed, continuous or manual operation]
  7. Type of central heating controls, if fitted.

Please contact me if you have any experiences of checking your gas bills and if your bill is correct against manufacturers published data.

I would also appreciate if you have any ideas for energy efficiency, or questions to ask. Please let me know.

Save Gas by Boiler Optimising and Servicing

We will match your boiler output to the size of your home. Many boilers use more gas to heat your home than is actually needed. Following boiler manufacturers guidance, we will match boiler output to your house size. Making your boiler cleaner, greener and saving you money!

Our boiler servicing will involve fully inspecting your boiler both inside and out. Some National Companies do the minimum to meet legal requirements. We are thorough, complete and check every part to ensure your peace of mind and safety. Our boiler servicing can take up to two hours to complete. We guarantee a first class service, our reputation depend on it.

SEDBUK was developed under the Government’s Energy Efficiency Best Practice Programme with the co-operation of boiler manufacturers, and provides a basis for fair comparison of the energy performance of different boilers. The following link gives details of boiler efficiency.

http://www.sedbuk.com/

There is also a cost calculator so you can check how much future gas prices will cost you.

We will balance your boiler output to supply heating to all radiators in the most efficient way. With the correct chemical inhibitor treatment, correct pump speed and radiator valve settings it is easily possible to improve boiler efficiency by up to 20%.

Central Heating system improvements and Control Upgrade

The addition of a filter within the central heating circuit can improve boiler efficiency by up to 6% [£60.00 per year for a three bedroom house]. This can also extend the lifespan of the boiler, pump and radiators by five or more years. This could save you an additional £500.00 based on the replacement cost of a new gas boiler, pump or radiators.

Your home will get warmer quicker and the temperature levels will be better matched to the needs of your home. You will be more comfortable and saving money!

A £150.00 spend could save you £800.00 over five years. A much better rate of return than any Bank or Building Society could offer.

We offer a range of radiator valve options that let you control each radiator by timer control. This can save up to 20% of boiler operation, without heat level reductions in the rooms in use during day and night. A £300.00 spend could save you £200.00 per year; making you £700.00 better off after 5 years.

Contact us for further details.

AIM – making your home warm and safe, without costing the earth

How Much Does Standby Cost Per Year?

The table below is a sample range of similar electrical products, showing details of power consumption. The plugged in working column is for average consumption. The maximum column gives details of the highest consuming product in the sample range. Many consume 100% to 150% more power than average. With that increase consumption the running costs can double or more. Note as shown in column 1 equipment just plugged in, not switched off at the socket will consume power, even when NOT on standby.

This picture shows a wide range of home electronic appliances that we rely on for many aspects of modern living. Careful use can save energy and money. Wasting energy costs money, and after use you can’t get a refund. Picture courtesy of Abt Electronics.

The two tables give details of home computer system power consumption and home music system power consumption.

Home Computer system

Item of equipment

Plugged in but NOT switched OFF at   socket outlet [Watts]

Sleep/standby [Watts]

Plugged in switched ON   charging/working [Watts]

Computer Desktop

2.84

£0.34

21.13

£2.50

73.97

£8.75

Computer Modem DSL

1.37

£0.16

5.37

£0.64

5.37

£0.64

Computer Monitor CRT

0.80

£0.09

12.14

£1.44

65.10

£7.70

Computer Printer [laser]

1.58

£0.19

1.70

£0.20

131.70

£15.57

Computer Scanner

2.48

£0.29

9.60

£1.14

9.60

£1.14

Computer speakers

1.79

£0.21

4.12

£0.49

4.12

£0.49

Total

£1.28

£6.39

£34.28

Home Music system

tem of equipment

Plugged in but NOT switched OFF at   socket outlet [Watts]

Sleep/standby [Watts]

Plugged in switched ON   charging/working [Watts]

Music Amplifier

0.27

£0.03

33.99

£4.02

39.16

£4.63

Music cassette deck

0.54

£0.06

4.53

£0.54

5.72

£0.68

Music CD player

5.04

£0.60

8.62

£1.02

9.91

£1.17

Music Radio

1.12

£0.13

9.48

£1.12

9.92

£1.17

Music Stereo

1.66

£0.20

6.80

£0.80

4.11

£0.49

Television CRT

2.88

£0.34

3.06

£0.36

2.99

£0.35

TV Cable decoder

17.50

£2.07

24.65

£2.92

29.64

£3.51

TV DVD recorder

0.00

£0.00

28.35

£3.35

31.37

£3.71

Total

£3.43

£14.13

£15.71

The interesting difference is that the computer system consumes 80% less power between stand by and switched on.  However the music system consumes only 10% less power between stand by and switched on.

The maximum column gives values for the highest tested item from the product range. These consumption values can be up to 200% more than average; costing up to three times more to run than the energy efficient products.

Check out the links below for more details.

http://www.sust-it.net

http://www.energystar.gov

The full list below gives further details of appliance energy consumption in the home.

Item of equipment

Plugged in but NOT switched OFF at socket outlet [Watts]

Sleep/standby [Watts]

Plugged in switched ON charging or working [Watts]

Computer Desktop

2.84

£0.34

21.13

£2.50

73.97

£8.75

Computer Laptop

8.90

£1.05

15.77

£1.86

44.28

£5.24

Computer Modem DSL

1.37

£0.16

5.37

£0.64

5.37

£0.64

Computer Monitor CRT

0.80

£0.09

12.14

£1.44

65.10

£7.70

Computer Monitor LCD

1.13

£0.13

1.38

£0.16

27.61

£3.27

Computer Printer [inkjet]

1.26

£0.15

1.81

£0.21

4.93

£0.58

Computer Printer [laser]

1.58

£0.19

1.70

£0.20

131.70

£15.57

Computer Scanner

2.48

£0.29

9.60

£1.14

9.60

£1.14

Computer speakers

1.79

£0.21

4.12

£0.49

4.12

£0.49

Fax machine

0.00

£0.00

6.10

£0.72

6.42

£0.76

Game console

1.01

£0.12

23.34

£2.76

26.98

£3.19

Microwave oven

0.00

£0.00

25.79

£3.05

1433.00

£169.47

Music Amplifier

0.27

£0.03

33.99

£4.02

39.16

£4.63

Music cassette deck

0.54

£0.06

4.53

£0.54

5.72

£0.68

Music CD player

5.04

£0.60

8.62

£1.02

9.91

£1.17

Music Radio

1.12

£0.13

9.48

£1.12

9.92

£1.17

Music Stereo

1.66

£0.20

6.80

£0.80

4.11

£0.49

Power tool charger

0.00

£0.00

0.00

£0.00

29.53

£3.49

Telephone caller ID

0.00

£0.00

1.27

£0.15

1.27

£0.15

Telephone cordless

0.98

£0.12

1.90

£0.22

2.81

£0.33

Telephone Fax Machine

0.00

£0.00

6.10

£0.72

6.42

£0.76

Mobile phone charger

0.00

£0.00

0.20

£0.02

3.68

£0.44

Television CRT

2.88

£0.34

3.06

£0.36

2.99

£0.35

TV Cable decoder

17.50

£2.07

24.65

£2.92

29.64

£3.51

TV DVD recorder

0.00

£0.00

28.35

£3.35

31.37

£3.71

Total

£6.29

£30.39

£237.66

Switch off and save.

Wasting energy costs money, and after use you can’t get a refund.

%d bloggers like this: