Af Mark J. Donovan
Har du nogensinde undret dig over hvad dælen, at store grøn, grå eller blå løgformet ting hænger ud for den side af din kedel system er?
Jamen det er et varmt vand ekspansionsbeholder og det spiller en vigtig rolle i din varmt vand varmeanlæg og varmt brugsvand system.
En ekspansionsbeholder bruges i lukkede varmt vand varmeanlæg og til varmt brugsvand. Den bruges til at aflaste at kunne bygge op i varmt vand VVS-rør, så de ikke bliver beskadiget, og begynder at lække.
Overdrevent pres kan forekomme på grund af termisk udvidelse eller vand hammer. Water hammer er, når du tænder og slukker for vand og ville høre et brag, hvis det ikke var til udvidelse tank.
Ekspansionsfasen tank indeholder to kamre, som er adskilt af en fleksibel gummi membran. Den ene side af ekspansionsbeholder indeholder luft (trykbaerende til 12 PSI), og den anden side er åben for det varme vand system og indeholder vand. Når trykket i varmt vand system stiger vandet presser ned på mellemgulvet og blidt presser luften. Som et resultat, når trykket i varmt vand system holdes på et konstant pres som vandet termisk Udvider eller kontrakter, og dermed beskytte varmt vand rør fra at blive beskadiget.
Hvis diagraph ikke hele tanken vil fylde. Når denne situation forekommer det varme vand rørsystem er i risiko for skader. Heldigvis ekspansion tanke har en backup-system, i form af et trykaflastningssystem værdi, der sidder lige over ekspansionsbeholder. Hvis tanken ikke og trykket bliver for højt i det varme vand rør, de trykaflastningsventil vil gå off. Varmt vand vil blive sprøjtet ud af systemet og kan gøre lidt rodet, men det er et meget mindre problem end et krakket loddemetal fælles sted i rørsystem.
At afgøre, om din varmt vand ekspansionsbeholder fungerer korrekt, kan du trykke på det og lytte til at høre forskel på lyde mellem den øverste del og nederste del. Den ene halvdel skal lyde hule, og den anden halvdel, med vand i den, bør lyde som en død bump, når du trykker på den.
Hvis det lyder som en død tænkte på både top og bund chancer er mellemgulvet i ekspansionsbeholder er mislykkedes, og det bør udskiftes.
Du kan også føle sig tanken, og for at afgøre, om den virker korrekt. Hvis det er varmt på den øverste halvdel, og afkøles på nederste halvdel er det mest sandsynligt at virke ordentligt. Hvis det er varmt i hele tanken, chancer er tanken er fyldt med vand og skal kontrolleres af en blikkenslager.
Så det er, hvad den store grøn, grå eller blå tank hængende på din varmt brugsvand system handler om.
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Obesity
Obesity is when a person is carrying too much body fat for their height and sex. A person is considered obese if they have a Body Mass Index (BMI) - weight in kilograms divided by their height in meters squared - of 30 or greater. Obesity can happen when you eat more calories than you burn off over a period of time.
The rate at which you burn off calories from food and drink is known as your metabolic rate. This is often faster during growth spurts and puberty, but reaches a fairly steady rate by adulthood.
People who are very active generally have a higher metabolic rate than those who are inactive because they burn off calories faster through energetic activity. For example, a labourer working on a building site may need as many as 4,000-5,000 calories a day to keep an even weight. In contrast, an office worker who uses a car to get to work, and does not exercise, may only need 1,500 calories a day.
If the amount of calories provided by your daily food intake is more than the calories that you burn off, your body will store the extra energy as fat. This is the body's way of protecting itself in case of starvation. However, starvation in developed countries is extremely rare, and this insurance against 'hard times' is hardly ever needed.
Most of us have more food than we need, and much of it is higher in calories than the human body was originally designed to cope with. Fast foods, high calorie snacks, and large portions all mean it is easy to take in more energy than we need. Obesity has now become one of the most serious medical problems of the western world.
The rate at which you burn off calories from food and drink is known as your metabolic rate. This is often faster during growth spurts and puberty, but reaches a fairly steady rate by adulthood.
People who are very active generally have a higher metabolic rate than those who are inactive because they burn off calories faster through energetic activity. For example, a labourer working on a building site may need as many as 4,000-5,000 calories a day to keep an even weight. In contrast, an office worker who uses a car to get to work, and does not exercise, may only need 1,500 calories a day.
If the amount of calories provided by your daily food intake is more than the calories that you burn off, your body will store the extra energy as fat. This is the body's way of protecting itself in case of starvation. However, starvation in developed countries is extremely rare, and this insurance against 'hard times' is hardly ever needed.
Most of us have more food than we need, and much of it is higher in calories than the human body was originally designed to cope with. Fast foods, high calorie snacks, and large portions all mean it is easy to take in more energy than we need. Obesity has now become one of the most serious medical problems of the western world.