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Saturday, November 13, 2021

Infection Rate vs Case Fatality Rate

Everyone is afraid to die.   In Covid Epidemiology,  Death is often measured by death rate,  i.e number of confirmed death per million or 100,000 people.   It is also measured by Case Fatality Rate (CFR).  CFR is the percentage ratio of the confirmed deaths over the confirmed infections.  

CFR tells also the seriousness or the severity of the Pandemic.   A higher CFR means more people are dying after catching Covid.  
However,  it is not always true;  a country having a very high infection rate and a very high death rate can also have a very low CFR.  

To accurately assess and interpret the seriousness and severity of the Pandemic,  one should also examine the infection and death rate together.

This table gives some ideas on what to look for:

Death Rate
CFR
Infection Rate
HighLow
High
HIghVery High RiskHigher severity and risk; Could be many infected not being counted
LowHigh severity and risk; could be caused by high Infections & high deathsNA
Low
HighNAMight be many infected or dead not being counted
LowLow or lesser severity and risk if the majority of infected are asymptomatic or false positiveVery low severity and risk

A high infection rate with a low death rate and a lower CFR could mean there is a lot of asymptomatic patients,  a condition likely to succeed in progressing towards the endemic condition.    A situation with a low infection rate,  a low death rate, and a low CFR is ideal but the residents must always be alert,  well prepared and well trained,  ready to face any Covid attack from the external communities or countries.

Navigation:
1.  3 top buttons are for adding and selecting countries.  The right button is for adding countries to pre-selected countries.   It will be displayed when the region and type buttons are selected.  The middle button is for selecting & building up countries(not working); the left button is to select chat lining in parallel or top/bottom at full width; 
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The Use of CFR

One can use CFR often to assess if a sudden surge in the Infection rate is caused by a new wave or by some changes in the measures that control the spread and the transmission of the Covid.  

For example,  there was a spike recently happening in Singapore.  The infection rate shot up 6 times in a short span of time,  from about 800 cases per day in mid-September to about 5,000 on 29 October. 

Many blamed the effectiveness of the vaccines.

This chart will easily show that the spike has not much to do with the effectiveness of vaccines or the Health Services.

The chart shows the Covid situation in Japan,  Germany, and Malaysia.  Malaysia has just tamed the Covid with infection and death rates lower than Singapore at the moment.  One can explain that Malaysian's higher CFR might be more due to the slightly better Health Services in Singapore.  But it would be difficult to explain why the Japanese and German CFR are also higher than Singapore,  except Singapore has just implemented mandatory Antigen Rapid Testing (ART) from September 2021.    This mandatory ART testing has helped to flush out a lot of asymptomatic in the Community. 

Monday, November 1, 2021

Why the Electricity Prices & WholeSale Electricity Rates are so high?

Jump to 

1) Update: 18 December 2021    New Energy Prices
2) Update: 25 December 2021   LNG Crisis Eased.
3) Update: 25 December 2021  New Tariff likely to be much higher.
4) Update: 30 December 2021  New Tariff for 1st Qrt 2022.

Other Related Articles


1 November 2021

Updated 2nd December 2021

Abstract:

There is a price hike in LNG  recently due to a global supply and demand issue.  This has caused the oil price to rise slightly.  According to EMA,  the Electricity price in Singapore should always track the oil price but this was not the case recently since 4 October 2021.  Singapore's wholesale electricity price has gone up by about 5 times whereas oil price hardly has any increase.  This article will try to find out why.  It also discusses how best we can "invest" in this turbulent electricity market.

"Invest" in Electricity Market?

Some will ask,  "I am on electricity fixed rates,  what electricity market are you talking about?". The answer is,  irrespective of whether we are on fixed-rate,  monthly-rate, or otherwise,  we are always inside the electricity markets so long as the country has de-regularised the electricity business and we are having an open electricity market.  Electricity supply on fixed-rate,  monthly-rate is just the type of electricity packages in the electricity market.  We must always know how the oil price or natural gas price is affecting us.   

Oil Price?

Again,  some will say,  "We are using mainly natural gas,  will oil price matter?"

In some countries like the US,  oil prices and gas prices are separately fixed by different markets.  They might have different prices.  Even in Asia,  we also have different pricing for LNG.    However,  in many other countries, like Singapore,  gas price is often pegged to oil price for some reasons  The gas prices used for generating power in the latter will fluctuate with the oil price.  Therefore,  the open market electricity price in these countries will fluctuate as much as the oil price depending on the supply and demand.

What Supply and Demand?

In an open electricity market,  the electricity price is always determined by a market called "The electricity market".  This market,  regulated by the local Electricity Authority will have the generating companies supplying and selling the electricity and the big consumers like the Municipal Electricity Board and the big electricity consumers,  bidding and buying the electricity.  Because the market is so small with a few players,  the market,  unlike the usual stock market,  will have special rules to encourage pricing competition (see Appendix2).  One thing is for sure,  the price will fluctuate wildly at times especially when demand outstrips the supply.

What we will have to do?

Whether or not we are on fixed-rate or wholesale rates quoted by electricity retailers or Municipal Electricity Board,  the price would be affected by the electricity market unless we are buying electricity at the usual regulated price.   We must always assess the oil or gas price before we buy electricity.  This is because energy price is always the biggest component in any electricity pricing.

How?

Oil or gas Futures prices either at the US's Chicago Mercantile Exchange (CME) or local stock market will always determine and affect the energy price.   Some Asian countries might have energy prices indexed with the Asian LNG market depending on the energy policy.   One must know how the energy price will move.  This is essential if one really wants to judge whether to enter the electricity market on a fixed price or wholesale price or just stick with the regulated electricity price.   There are also other things to watch out for.  

It will be riskier to jump to a conclusion just because one electricity supplier can supply the cheapest price for some reason.  If that is the case, it would be better for one to stick to the usual regulated electricity price.  The electricity market is not for us.

Why?

The Electricity Market,  in one way or another,  works like a stock market except it is heavily regulated.  Unless one is familiar with a stock movement,  their business background, etc,   one would not buy the stock of that company just because it has the cheapest price in the market.  Similarly, an electricity retailer can go burst,  applying the unfavorable terms in the contracts and selling us electricity at an unreasonable price without the blessing of the regulating bodies.  It is then left to ourselves versus the electricity retailer to settle the problem. The regulator might be acting just as the Arbitrator if the retailer did not break any rules. 

Then How?

The following can be used as reference:

1)  Shortlist the electricity suppliers in terms of their business background to assess if they are trustworthy and can remain in business within the contract period;

2)  Find out which among the shortlisted can supply you the electricity at the cheapest and cost-effective rate.  Some will have special offers that are better than others;

3)  As to whether to take up long term or short-term contract or just a % discount from the usual regulated price,   one will have to assess what energy price will be likely within the contract period.   If one expects the energy price to go up and up,  then it will be good to sign a long-term contract;  otherwise,  just sign a short-term one or even take up the % discount or just the usual regulated price;  then,  wait for the energy price to drop to the bottom before signing up for a long-term contract. 

What is the Energy Price Now in Singapore?

a)  The Brief


The electricity price in Singapore is always fixed by the EMA's Electricity Market.   Gencos,  the generating companies,   will offer every half-hour to sell the electricity into the spot market.  Rightly speaking, large electricity consumers, electricity retailers will bid or buy the electricity.  Presently,  there is no consumer bidding per se in the market.  The Power System Operator (PSO), governed by EMA, will provide the demand load for each period based on the collected information.  The power generating companies (Gencos) will then offer their selling price based on these demand load and their operating cost of which,  energy price will be the main component.  


90% of Singapore's power generation is using natural gas.  In the past,  Singapore's natural gas for power generation are imported through piped gas from Indonesia.  That gas price is pegged to oil price according to the supply agreement until 2023 (see reference 4).  LNG began to supply in 2013. Because of this,  there was this speculation about the Gencos in Singapore are using LNG prices when they offer their selling prices in the EMA's Electricity Market.


Singapore used to have an LNG Futures Market in SGX Exchange Board that supposes to fix the price of LNG but now it has been replaced by the Electricity Future's Market.   The LNG  price in Asia is now fixed by the  LNG Japan/Korea Marker PLATTS Future - (JKM). 


Anyway,  EMA believes that the natural gas price that is used for power generation is still pegged or indexed to the oil price.  EMA claimed that "This is the market practice in Asia for natural gas contracts".    Therefore,  this article will be using only oil price and SGX electricity future price as guides to assess the future energy prices in Singapore.


If the price is not pegged to the oil price,  the trend would be a lot different in the energy pricing today because there is a global demand and supply issue presently lingering around the natural gas pricing.  More countries are converting their coal or oil-fired to natural gas-fired power plants & also,  there is a natural gas supply shortage globally.

 

b)  SGX Electricity Future (Chart to be updated regularly)


From the December 2021 Contracts and the Contracts beyond,  it would appear that the electricity price has gone over the peak of 522 on October 14.  It is around 356 on Nov 25 and is slowing dropping towards 185  for the December 2022 contracts.   It is likely the trend of the electricity price is falling going forward.  Note that this chart will be updated regularly.







c)  Oil Price Future (chart updated on 2 Dec 2020)

If EMA is correct that the natural gas is pegged to the oil price,  then it would be better for us to view the energy price using the oil price chart. 

The Situation on 2 December 2021

The Technical Analysis of the oil price chart indicates that the price has dropped about 19% since Friday, November 26 when the market was spooked by the fear of a new Covid variant,  called Omicron, emerging from South Africa.  

The oil price now rests on the upper trendline of a falling wedge that has been trapping the oil price since 2008.   The oil price will make attempt to recover from this point.   If it is not successful,  we shall see a bearish oil price pattern falling toward USD50/= which is around the breakeven price of a new oil project today in the US.  


Note:  Please note that the scale of the chart is in months,  the analysis assumes that it will take weeks or months for any price movement.  




The WSJ Market 

The Crude Oil Contracts (CL1 @ NYMEX) in the WSJ Market is showing a declining trend for the various future contracts. The price trend is shown attached.  The chart predicted that oil price is likely to fall in the future months.



Why is Singapore Wholesale Price still rising?

The recent readings of the electricity price in Singapore have no sign of falling despite an 18% fall in oil prices.   The following chart is showing that the Electricity price in Singapore is not tracking the oil price;  instead,  it is trying to follow the LNG price trend.    

The chart shows that LNG spiked by 4.5 times and the Electricity price went up by about 3.5 times since March 15,  2021.   Before August 2021,  the Electricity price was tracking oil price nicely.  This is not what EMA has been saying about the natural gas used for power generation being indexed or pegged to the oil price.  




Conclusion

The sudden rate jump in those taken up wholesale electricity prices is reflecting the open electricity market prices.  It will go up and down according to the energy price because energy is the biggest component in power generation.  One should always get out of the wholesale market,  either taking up the regulated electricity price or other electricity price plans at the moment.  Which plan to take next will depend much on the Future pricing and trending of the energy price. 

Should natural gas used for power generation be indexed to the oil price as what EMA has indicated,   the Electricity Future Price should have tracked the oil price and started to fall.   It would appear there is some confusion in the Electricity market that will require the attention of EMA.   They should investigate why the electricity price in Singapore was not tracking the oil price.    




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Update: 18 December 2021

1) SGX Electricity Futures

The electricity futures hasn't yet responded to the hike in Asian LNG prices on 16 December.   The next few days will see if the hike in LNG price will make any difference.  The price has risen slightly from $356 per unit @ 27  November to the present price of $465 per unit



b)  Nymex Crude Oil Price

The Nymex crude oil price has slid again to hit USD70/=.  But it has reflected from the trendline as shown in the attached.  Until the price drop below the trendline,  it would be hard to tell its exact direction.

c)  Asian LNG Price

The Asian LNG price has broken the rising wedge that has trapped the LNG price since early 2021.   The trend is very bullish bearing unforeseen circumstances.



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Update: 25 December 2021

LNG Crisis in EU and Asian Region eased.

The Asian LNG took a plunge on 23 December when the price tumbled over 16% to fall from a height of $24/= on 21 December.  The combined effect of Russian increasing natural gas output, China buying gas from the US, and US merchants diverting gas to Europe could have caused this drastic drop in price.   

Technically speaking,  the gas price is falling back into the bearish rising wedge.   Barring unforeseen circumstances,  one could say the natural gas crisis in the EU and Asian regions has been eased.  It is back on track to where it was before;  hopefully,  the breaking down of the bearish rising wedge will cause the gas price to ease further. 





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Update: 25 December 2021

New Tariff for Next Quarter likely to be much higher. 

The electricity futures has stubbornly stayed above 460 and would not want to come down especially after the LNG price spiked over 20% earlier in the week.   The futures price for December 22 went up more than 25% from 180 a week ago to 226 today.  We expect the regulated tariff for the next quarter in 2022 to be adjusted upwards.    This announcement is likely to be made within this week.  This higher regulated tariff might prompt the other electricity retailers to adjust their price plans to follow suit.



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Update: 30 December 2021

The SP group announced today that Singapore's regulated electricity tariff for the first quarter of 2022 will increase by 5.6 per cent.  This increase of 1.33 cents per kWh from last quarter is the fourth consecutive quarterly increase since January 2021 as shown by this chart.  The new electricity tariff is closely tracking the price of oil price.

Saturday, October 30, 2021

Burner of the Stove Won't Hold Flame

The burner of the gas stove won't hold the flame all of a sudden. What can be wrong and how to go about repairing it?

What happened?

One of the 3 burners in our Ariston gas stove refused to hold its flame when we changed to a new tank of gas.   This happened suddenly.  What can be wrong?

What's Wrong

This sort of problem will happen because there is an inbuilt safety feature to turn off the gas to the burner automatically.   This safety feature is supposed to work only when the flame at the burner went out suddenly while the gas is still flowing.      However,   when there is something wrong with the feature,   the flame at the burner will not hold its flame as you have just seen.  

To understand the problem better,  let examine this simplified diagram showing only the burner and its control mechanism.    

The heart of the control system is the solenoid valve.    During proper operation and when there is a gas flame at the burner,   the thermocouple will generate a small electric current to power the solenoid.  This will cause the solenoid to hold on to the plunger,  allowing gas to flow through the valve.

To understand the problem better,  let examine the above-simplified diagram.   The diagram shows an electric thermocouple is connected electrically to the solenoid valve which is the heart of the control mechanism.  This thermocouple is always installed near the burner so that when there is a flame,  the flame will heat up the thermocouple and generate a small electric current to power the solenoid.  Inside the solenoid valve is a spring-loaded plunger.   At the end of the plunger,  there is a rubber seal.   At the other end,  there is a small magnet attached to the plunger.   

When the burner is not in use,  the rubber seal will close the valve,  stopping the flow of gas even if the shut-off valve is opened

During normal operation,  if someone pressed the control knob as shown, a gust of gas will flow into the solenoid chamber,  This will push open the plunger towards the solenoid.  If at this moment,   the burner is lited up,  the flame will heat up the thermocouple.  This will generate a small electric current to power the solenoid.   This powering of the solenoid will hold the plunger in an open position through the magnet.,  This action will allow the gas to continue flowing through the control valve.    

During this operation,  if the flame goes off for some reason, or the burner was not lited up,  the thermocouple will stop generating electric current.  The plunger will then return back to its original position and close the control valve 

How to Repair?

There could be a few troubleshooting steps to carry out in order to repair the problem.    The troubleshooting should always start from the source,  i.e. the thermocouple.  

The troubleshooting will need some skills.  This video will be able to help.

Wednesday, October 27, 2021

What is this Dry Mode Control in Air Conditioner?

Those who have newer air conditioners bought in recent years will notice that there is an additional button in the remote controller.  This button is called "Dry Mode".  Some like it as they claimed it could save energy; some just ignore it completely.   This button is not available in the older models. What is this button and how does it work to provide cooling?

Why The Button?

Our body is sensitive to temperature as well as humidity. When the temperature is hot or cold, our bodies can feel it immediately. When the humidity is high or low, we might not feel it immediately but over time, our body will react to it. 

This is because 1/2 to 3/4 of our bodies are full of water. When water evaporates fast enough from our bodies, we will feel the sensation.  The feeling is just like we are under a fan.  The air blowing towards us evaporates vapor from our bodies.  The faster the airflow,  the higher the evaporation, the better will be the cooling. 


The air conditioner is also an air dehumidifier but not as efficient as a real dehumidifier.  When it cools the air,  it also removes water vapors from the air.  This is a natural cooling process. The dry mode button will instruct the air conditioner to operate more like a dehumidifier.
 
The dry mode will be particularly useful in tropical countries where humidities are usually high.  The dry mode can help to lower humidity in the room more quickly than the normal cooling mode.
 

How Does it Work?

As a simple illustration of how airconditioning and dry mode works,  if the air conditioner's airflow is strong, it is working as an air conditioner; on the other hand, if the airflow is reduced, it is working as a dehumidifier.   It appears that the airflow is forcing the air conditioner to change from air conditioning mode to dry mode. 


Slow Fan Speed Not Freeze Coil?


Of course, its controls are not so simple.  The control involves also the speed control of the compressor.  There is also a need to make sure the cooling coil will not freeze when the airflow is reduced.  This is why the dry mode button is not always available in older models that have fixed-speed compressor motors.

This is one possible control strategy:

The Best Design Strategy for Dry Mode?


Dry Mode slows down the fan speed so that the evaporator coil can condense more vapor out of the air when the air passes through the coil.  It will use some energy and be able to lower the humidity faster than usual to an acceptable and comfortable level.    

Different manufacturers have different design strategies for dry mode; some adjusted also temperature as well as the airflow in their cooling strategies. The idea is to achieve a desired comfortable cooling condition.

It has been commonly accepted by researchers that the most comfortable room cooling condition is 25oC@ 55% humidity. This is the room condition that most manufacturers are using to design their air conditioners.  
For the angle of saving more energy,  there is a tendency for the professional to pick 65% humidity level as the new comfortable humidity level.  

Anyway,  different people might have different feelings and reactions towards temperature and humidity.  For this reason,  most manufacturers will still allow users to adjust the temperature in the dry mode.  If temperature adjustment is available in dry mode,  most users will still use 25oC as the setpoint temperature.   This does not necessarily save energy.  This is because the energy to maintain the room at the comfortable setting of 25oC@ 55% humidity will more or less remain the same. 

Will Dry Mode Save Energy?

The dry mode lowers the fan speed allowing moisture in the air that flows through the evaporator coil to be removed more quickly.  It still consumes about the same energy to maintain the room's humidity at the desired comfort level of 55%.  However,  if one finds it comfortable to allow the room temperature to be set higher than the usual 25oC, one will be able to save some energy.

Operating an air conditioner at econ cooling mode or auto mode will save more energy as the air conditioner is always set to run at the most efficient designed load capacity under this operating mode. Depending on the design, the airconditioner's efficiency can vary a lot at different load capacities.


Difference between Cool, Dry, and Econ Modes?

The newer air conditioner having an inverter or otherwise to control the speed of the compressor motor allows 2 additional modes of control,  namely Dry Mode and Econ Mode.  The differences between them are briefly described in this table:

ModeMode DescriptionUsageEnergy Saving
Cool ModeDefault modein hot and humid weather to maintain constant temperature controlSaving Depend on selected temperature;
Dry ModeNew FunctionIn not too hot weather or raining season to lower humidity to achieve comfort coolingSave energy if the temperature can be allowed to be set higher.
Econ ModeNew FunctionIn not so hot weather to run the air conditioner at a most efficient levelPrevent excessive low-temperature cooling to lower electricity bills



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