Plasma TV vs LCD TV

Written by ian tham

Continued from page 1

You may also want to factor how long your new display device can last. LCD TVs have a greater life span than plasma TV. They have a life span of 60,000 hours compared to about 30,000 hours for plasma TVs.


Power consumption

Again LCD TV have this advantage over plasma TV. Power consumption for LCD TV is 30% less than plasma TV. With rising oil prices, maybe it is better to get an LCD TV. Further more, plasma TV generate more heat and if you live in an airconditioned home,repparttar air con usage will definitely rise too.


Viewing Angle

If you are going to invite many guest to your homes, a plasma screen will do better. It has a wider viewing angle than LCD TV. Guests can easily view on either left or right side ofrepparttar 150175 Plasma screen without fear of repparttar 150176 loss of image which is inherent of LCD TVs.


Response Time

If you enjoy action movies or sport programmes, plasma TV offer a better deal as it can handle fast moving images better than LCD TVs. Traditionally, Viewers see a blurry moving images for LCD TV . However, this may no longer berepparttar 150177 case asrepparttar 150178 response time for LCD TV has come down to as low as 12 milliseconds.


Burn in effect

Plasma TV suffers from this particular effect called burn in. You get a permanent ghost like image stuck on your screen. This isrepparttar 150179 result when you have static display over a long period of time.

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Methods of Improving Boiler Efficiency

Written by Thomas Yoon

Continued from page 1

As steam is generated fromrepparttar evaporation of water,repparttar 150058 remaining water inrepparttar 150059 boiler becomes more and more concentrated. This must be drained away during blow down.

The challenge is to controlrepparttar 150060 draining torepparttar 150061 minimum.

Recovering Waste Heat from Blow down

Since it is necessary to blow down to controlrepparttar 150062 total dissolved solids inrepparttar 150063 boiler water, methods can be adopted to recover some ofrepparttar 150064 heat back fromrepparttar 150065 drained hot water.

Blow down tanks, heat exchanger tubes and pumping arrangements can be fabricated to recover back some ofrepparttar 150066 heat back intorepparttar 150067 boiler.

Stopping Dynamic Operation

Whenever a boiler starts or stops, a few minutes are spent running repparttar 150068 forced draft fan for purgingrepparttar 150069 combustion chamber of unburnt gases. This is a necessary step forrepparttar 150070 safe operation of a boiler.

During this timerepparttar 150071 heat fromrepparttar 150072 boiler water inrepparttar 150073 shell or tubes will be lost torepparttar 150074 purging air.

To avoid this type of losses, it is better to maintain a steady firing condition inrepparttar 150075 boilers.

Reducing Boiler Pressure

By reducingrepparttar 150076 boiler pressure, some ofrepparttar 150077 heat losses through leakages or transmission may be reduced slightly. However there can be problems withrepparttar 150078 boiler with reduced pressure. The boiler circulation may be upset andrepparttar 150079 steam lines may have insufficient capacity and flow to transportrepparttar 150080 low pressure steam.

Operating at Peak Efficiency

When operating two or more boilers, improved efficiency can sometimes be obtained by unequal sharing ofrepparttar 150081 load so thatrepparttar 150082 combined load operates at peak efficiency.

Preheating Combustion Air

Any heat loss fromrepparttar 150083 skin ofrepparttar 150084 boiler torepparttar 150085 boiler room can be utilized back for combustion. By preheatingrepparttar 150086 intake airrepparttar 150087 combustion inrepparttar 150088 furnace becomes more efficient.

Switching from Steam to Air Atomization

For burners with steam atomization, switching to air atomization will naturally result in less steam consumption overall and better boiler efficiencies. This is only applicable for heavy fuel oil burners.

Switching to Lower Cost Fuel

When comparing natural gas and fuel oil, ifrepparttar 150089 cost isrepparttar 150090 same or more per BTU delivered, switch over to fuel oil.

The reason for this is that inrepparttar 150091 combustion process, hydrogen combines with oxygen to form water. The latent heat of vaporization is lost when water vapor leavesrepparttar 150092 boiler stack.

Fuels like natural gas with higher hydrogen to carbon ratio will lose this heat more than those with lower hydrogen-carbon ratio like fuel oil.

However one must also recognize that there will be increased maintenance, operating costs and greater need for more excess air in order to achieve complete combustion for fuel oil. In addition, soot deposits and incomplete combustion might also affectrepparttar 150093 overall costs.

Some ofrepparttar 150094 ways mentioned above may not be feasible at all for your plant. Each of them may result in only a few percentage points of boiler efficiency improvement. However, if carried out carefully and withrepparttar 150095 proper tools and instruments, they do add up to huge savings.

Many years of working experience in Marine, Facilities, Construction has given the author material for writing e-books and articles related to engineering, and management. Subscribe to facworld ezine More information at Marine Engineer and M & E Engineer

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