“I bought this guide a few days ago to prepare for my interview with Oracle. Many of the questions they asked me were from this guide. I found this book absolutely great!”
Well it does not. In a busy hotel it seems so, because there is heavy water usage, moving the water from hot water tanks along the common pipes more frequently.
Because in a hotel (or any other industrial building) there are three plumbing lines: hot water supply, hot water return, and cold water. Hot water is continually pumped through the supply, and returned through the return so that there is always hot water in the circuit (the return water gets reheated and pumped back through the supply). This circuit has short (usually 5-10 feet) take off lines that connect directly to the fixtures. This means that when you turn on the hot, you only have to pump out 5-10 feet of water that has been sitting in the pipe before the hot water moves from the supply line to the faucet. In most houses however, the hot water is not recirculated, so if it has been a while since you’ve used the hot, you will need to pump out all the water in the line until water from the water heater reaches the faucet. Also, most houses do not have their plumbing lines insulated, whereas hotels do.
Modern hotels have small coil water heaters in each room about the size a small fuse box… they ensure quick hot water for showers.
They provide hot water by running the water trough the heated coils. This is actually a more efficient means of heating the water, and providing a better service.
Because hotels are selling a service. If the hot water doesn’t come quickly people will be unhappy with the service and will not return to the hotel or the chain.
like if take the process of boiling the water for each person at home as equivalent to an overhead of creating connection to some resource in programming terms.
so instead you can use pooling where you dont need to ceate and destroy the connection (ie dont need to heat water for each indivisual) but can use one already from pools. so hot water comes faster. and because you know that in hostel the the resources( ie hot water) will be frequently used so already established connections will be efficiently used.
So the summary of the story is:
At home, you don’t need hot water that frequent- usually it’s 1-2 times a day. So heating each time and waiting is more profitable than having a continuous supply of hot water. But the corresponding demand in hotel is much higher. The customer satisfaction obtained and the subsequent business advantage obtained is much higher than the amount spent in providing hot water. Now talking about how they do that: They have a central hot water tank which is heated electrically. The pipe is made of a material which has a high melting point and is a heat insulator so that there’s less heat loss in transmission over long lines. Now talking from technical perspective: is the overhead of maintaining the connection(continuous supply of hot water) less costly in terms of time and money and bandwidth than creating and destroying the connection each time. Another technical viewpoint is reply caching: is storing the value for an input and sending the same answer for subsequent requests better than calculating before replying each time. Is the disk space spent better than the overhead involved in calculating each time? It all depends on the frequency of requests.
Well it does not. In a busy hotel it seems so, because there is heavy water usage, moving the water from hot water tanks along the common pipes more frequently.
Because in a hotel (or any other industrial building) there are three plumbing lines: hot water supply, hot water return, and cold water. Hot water is continually pumped through the supply, and returned through the return so that there is always hot water in the circuit (the return water gets reheated and pumped back through the supply). This circuit has short (usually 5-10 feet) take off lines that connect directly to the fixtures. This means that when you turn on the hot, you only have to pump out 5-10 feet of water that has been sitting in the pipe before the hot water moves from the supply line to the faucet. In most houses however, the hot water is not recirculated, so if it has been a while since you’ve used the hot, you will need to pump out all the water in the line until water from the water heater reaches the faucet. Also, most houses do not have their plumbing lines insulated, whereas hotels do.
Modern hotels have small coil water heaters in each room about the size a small fuse box… they ensure quick hot water for showers.
They provide hot water by running the water trough the heated coils. This is actually a more efficient means of heating the water, and providing a better service.
Hotels have a central heating system which supplies hot water unlike at homes it starts heating up when we start the heater.
Because hotels are selling a service. If the hot water doesn’t come quickly people will be unhappy with the service and will not return to the hotel or the chain.
its like connection pooling in idea.
like if take the process of boiling the water for each person at home as equivalent to an overhead of creating connection to some resource in programming terms.
so instead you can use pooling where you dont need to ceate and destroy the connection (ie dont need to heat water for each indivisual) but can use one already from pools. so hot water comes faster. and because you know that in hostel the the resources( ie hot water) will be frequently used so already established connections will be efficiently used.
So the summary of the story is:
At home, you don’t need hot water that frequent- usually it’s 1-2 times a day. So heating each time and waiting is more profitable than having a continuous supply of hot water. But the corresponding demand in hotel is much higher. The customer satisfaction obtained and the subsequent business advantage obtained is much higher than the amount spent in providing hot water. Now talking about how they do that: They have a central hot water tank which is heated electrically. The pipe is made of a material which has a high melting point and is a heat insulator so that there’s less heat loss in transmission over long lines. Now talking from technical perspective: is the overhead of maintaining the connection(continuous supply of hot water) less costly in terms of time and money and bandwidth than creating and destroying the connection each time. Another technical viewpoint is reply caching: is storing the value for an input and sending the same answer for subsequent requests better than calculating before replying each time. Is the disk space spent better than the overhead involved in calculating each time? It all depends on the frequency of requests.
Regards,
J1gs4w
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