Why night lamps called as zero watts bulb, even though it consumes some amount of power ?

There are four different types of lamps available in the market .

1.Incandescent lamp

2. Fluorescent lamp

3.Compact fluorescent lamp

4.LED lamp 

Among these types, we are mostly used incandescent lamp as a night lamp.

Actually low intensity incandescent bulb are called as Zero watt bulbs and there is no lamp with zero watt consumption.

Even a small LED indicator consume power,though it is a fraction of a watt.

The zero watt lamp actually consume 15-20W.

In earlier days, we were using only zero watt lamp at night and other loads were kept off at home .In such case, the conventional type electromagnetic energy meter could not record the energy consumption because the disk inside meter did not move when the load was only with 15 Watt.

But in our modern life, we are using the digital energy meter and it is  capable of capturing in fraction of watt.

My recommendation is to procure the LED type zero watt bulb for your home instead of incandescent lamp . LED type night lamp will consume less power i.e 0.5 W or 1 W and you can save the electricity here and there by we can save your money too.

Thanks for the reading!..

By

Ashokraj S 

BE EEE

What is star rating in electrical appliances and what is EER and its calculation

Buying a new air conditioner and electrical appliances is really a big task for all.Because if we procure bad product then it will hit our electrical bill more high than usual.

So we need to check few parameters before buying the product. The parameter such as star rating, energy efficiency ratio, seasonal energy efficiency ratio,indian seasonal energy efficiency ratio etc..

 Star Rating:

The government of india was launched the BEE bureau of energy efficiency in the year 2002 under energy conservation act 2001.

The main moto of BEE is to reduce the power intensity with indian economics and to promote the use of energy efficiency equipments. 

To promote the equipments,they introduced star rating system. The star values from 1 to 5.

The highest star rating represents the maximum efficiency of the equipment. 

After introducing this, many manufacturers were voluntary involved in the star labeling programme to get the more customers. 

All the electrical appliances ( TV, AC, LED lamps, heater, refrigerators etc.) would have this star rating.

EER:

Energy Efficiency ratio is defined as ratio of output cooling energy to the input electrical energy at given operating points.

EER is generally calculated with 95 degree F out side temperature and inlet temperature of 80 degree F and 50% relative humidity.

If you see the home air conditioners, there would be lable on it and it contains  the value of star rating and values of EER.

But after Jan 2018, the BEE was also introduced ISEER (indian seasonal energy efficiency ratio) because AC willbe operated maximum at summer season and  operated less at rainy seasons. 

We willbe discussing later about SEER and ISEER..

Let us see how to calculate the EER if you know value of TR and KW.

Example 1:

If 24000BTU capacity of AC  is operated under 1200W power,then what would be the EER? 

EER =(Cooling energy in BTU)/(Electrical energy in watt)

= 24000/1200

EER =20 

Example 2:

If 24000BTU capacity of AC  is operated under 2400W power,then what would be the EER? 

EER =(Cooling energy in BTU)/(Electrical energy in watt)

= 24000/2400

EER =10

From the above examples,  we need to understand that we need to checkup the EER and star rating while we purchasing the new AC for your home.

Thanks for reading !...

By 

Er. Ashokraj S 

Difference between MCB & Isolator

MCB:

MCB is Miniature circuit breaker,which used to  protect the electrical equipment from over load and short circuit conditions.

There are 5 type of MCB in the market based on the magnetic trip current,

1.Type B

2.Type C 

3.Type D 

4.Type K 

5.Type Z 

Based on the applications and demand, we are using the MCB's in domestic & industrial area.

There are two trip unit available in MCB, there are thermal trip unit and magnetic trip unit.

When over current is drawn by the electrical equipment, thermal trip unit trip the MCB,whereas magnetic trip unit will trip the MCB when the short circuit occurs .

Isolator :

Isolator used to isolate the electrical equipment from power supply or electric current for servicing and maintaining the equipments.

There is no protection system available

If over load occurs, the isolator will burns out.

Difference between MCB and Isolator:

        MCB                                   Isolator 

1. Automatice device        1.Manually operated 2.Protection available      2.Not available 

3.High Cost                           3.Low cost

4.Electronic circuit            4.Mechancial device 

made by transistors             act as switch

5.Arc suppression              5. Not available 

mechanism available 

6.High current                    6. Low current 

withstand                                  withstand 

capacity                                     capacity 

7.ON load device                  7.OFF load device

Please comment if you may have any doubts. 

How to calculate GPM of AHU/CSU/FCU/VAHU/PAHU

GPM stands for gallon per minute.

It is one of the unit  used to measure the water volumetric flow rate. 

The stand formula for calculating the TR as follow,

TR = (GPM × Delta T)/24 

For this,we can find out the GPM 

GPM =( TR×24)/Delta T 

Where GPM is flow rate 

              TR is ton of Refrigeration 

              Delta T is temperature difference between supply and return chilled water

Let us consider AHU and its  inlet and outlet water temperature is 30 degrees fahrenheit and 38 degrees fahrenheit and TR is 10.

Apply all these values in the GPM formula

GPM = (10×24)/(38-30)

          = 240/8

  GPM=30 

Here the GPM depends only on temperatures, as the TR is constant throughout the process.

How to calculate CFM of the room

CFM stands for  cubic feet per minutes.

To calculate CFM, we need to determine the volume of the room and ACH (Air changes per hour) firstly. 

We all know how to calcualte the volume. 

The product of length , width and height called as volume of the room.

Let us consider the room having 10 feet length and 10 feet width and 10 feet height.

So volume of the room comes around 1000 cubic feet or F3.

Next we need to know about ACH.

ACH calculated as how many times air entering and leaving  from the HVAC system in a one hour called as ACH.

ACH depends on temperature and structure of the building and capacity of the equipment etc.

Let us assume ACH as 6 for the proposed room

Now we can calcualte the CFM and refer below,

CFM =(ACH ×Volume of the room)/60

          =(6 ×1000)/60

          = (6000/60)

          CFM=100 cubic feet /min or F3/min

Hope you understand the calculation and other consideration. 

Regarding ACH ,we will post the details and standard table following across the industry. 

How bad distilled water affect our inverter lead acid battery perfomance

Hello Friends,

As you know, the power generation in India is  low than our demand. To meet out this, our government is trying to  implement more power stations like thermal, nuclear, solar, wind plants etc..

During the power cut, most of us are using the home inverter, in order to carry on our routine work.

Hence choosing inverter and its battery is very most important and also maintenance of those are also much important.

Generally, we all are using lead acid batteries in our home and we need to topping up the distilled water when the acid level is goes down.

Here we need to take more care for buying the distilled water.

The water should have 5 ppm(parts per millions) or below and it may be the recommendation by many of manufacture.

But in recent report, the researcher advised us to not to buy distilled water from road side shops.

Because the water having the ppm of 30 and more.

To buy the good distilled water, I am recommending you to procure one TDS meter which cost around just Rs.200 only.

If we use TDS meter, we can check the TDS level of distilled water and if the value is less than 5ppm, we will add otherwise we can ignore. 

Incase if adding the bad distilled water, it will affect the battery performance and its life.

First, the battery will loose its charge holding capacity and if we adding the same bad water for a certain period, you will get low battery power backup problems and finally your battery will die one day.

So please be caution on buying the distilled water and get the TDS meter to ensure the TDS level before topping up.

Thanks.

What is Bus Coupler

Bus coupler is a device used to couple the bus one with another without any power interruption and without creating dangerous arc.

Bus coupler may used in HT panel and MV panel and LT panel etc.

The bus coupler may be a ACB or VCB or MCCB or else MCB.The selection of breaker will completely based on the customer usage. 

Let us imagine, we have one 1000KVA transformer and one 500KVA transformer. 

The first one is providing the power supply to the Healthcare industry and the second one is providing the power supply to the data center.

And consider there are no redundancy of those the transformer. 

In this case, if any one transformer failed ,the load depends on that transformer does not have  any backup power supply which impact the operation of healthcare industry and data center.

But if we use the buscoupler between both our transformers ,we can shift the power supply one over to another and vice versa and there would not be a chance to the interruption of power supply at any situation.