دوشنبه، ۱۵ آذر ۱۳۹۵, ۰۵:۵۶
 
«اقتصاد مقاومتی، اقدام و عمل»
آبگرمکن
وسیله­ای گرما­برقی است که برای گرم کردن آب استفاده می­شود. انواع آبگرمکن برقی شامل آبگرمکن زمینی و دیواری می­باشد. پس از رسیدن به شرایط پایدار، آزمون مطابق استاندارد ملی 1563 ISIRI و بر اساس استاندارد بین­المللی IEC60379 انجام می­شود. اتلاف انرژی در روز برحسب kWh/d محاسبه می­شود و همراه رتبه بازده انرژی بر روی برچسب انرژی درج می­گردد.
صرفه­جویی حاصل شده از طریق ارتقاء:
صرفه جویی سالانه حاصل شده (%)
اختلاف شاخص
وضعیت فعلی رتبه
متوسط شاخص
وضعیت رتبه در اول برنامه
وسیله
27
1.48 (kWh/d)
A
5.5 (kWh/d)
C
آبگرمکن برقی
 
 
Choose a water heater with a high energy efficiency. The energy consumption of a 'Grade 1' electric water heater on standby is about 25% less than that of a 'Grade 3'.
 
 
In houses that lack natural-gas service, an electric on-demand heater may be tempting. But a large-capacity heater uses a lot of juice: some models need 220V, 120-amp service. An electric water heater may still make sense, since heating water with propane costs more than heating water with electricity in many regions of the country.
Tank-style water heaters can run on electrcity or be fired by a variety of fuels, including propane,
Tank-style heaters are inexpensive, simple, dependable, and widely available. Electric and gas models are by far the most common, although oil-fired heaters also are available. Once water is brought up to temperature it sits in the tank until it’s needed. Water is reheated as necessary. All tank-style appliances lose heat as water sits in the tank. A thicker layer of insulation around the tank helps minimize this problem. “California models,” made by most manufacturers to comply with California’s tough energy codes, come with R-15 or greater insulation. That’s more than twice as much as a conventional tank heater.
for their purchase. Among the hurdles faced by manufacturers of heat-pump water heaters is the high initial cost, the need
 
Electric Domestic Water Heaters
Electric Water Heater
Electric water heaters supply hot water for household use in many Canadian homes. An electric water heater usually consists of a tank, thermostats, two electric resistance elements (which are submerged inside the tank), and inlet and outlet pipes for cold and hot water. Internal thermostats regulate the temperature of the water.
Tanks are typically covered with foam insulation and lined on the inside with a ceramic glass layer. When cold water replaces the water withdrawn from the tank and the temperature of the water falls below a certain level, the elements are activated, reheating the water to the correct temperature. Essentially, electric hot water heaters are large closed electric kettles.
The submerged electric resistance heating elements in water heaters are very efficient, providing about 99 per cent of the available heat to the surrounding water. Even so, older water heaters lose heat as a result of standby losses.
Reducing Energy Losses
Most direct heat loss from water heaters is made up of:
*    losses by heat conducted through the tank walls and base
*    losses by hot water convection through the hot and cold water feed pipes
The operating efficiency of a domestic hot water system can be improved significantly by designing the system carefully and selecting equipment that generates hot water more efficiently and reduces stack and standby losses. For starters, you might want to lower the temperature of the water in the tank.
Note: In the past, tap water was usually set to 60°C (140°F), and homeowners were told to lower the set temperature to prevent scalding. However, a set temperature of 60°C (140°F) is required for the reduction of legionella bacteria. If you wish to protect children and others in your home from high water temperatures, use a mixing valve or add some other sort of scald protection downstream of the water heater.
Reducing Standby Losses
Standby loss is heat lost to the surrounding air from the water in a domestic water heater and connecting pipes. It is a function of:
*    the temperature difference between the water and the surrounding air
*    the surface area of the tank
*    the amount of insulation encasing the tank
To reduce standby losses, consider the following options:
*    Cover the tank with an insulating blanket. Caution: It is extremely important not to insulate over any controls or obstruct the vent connections or combustion air openings. The insulation should not come in contact with the vent connector.
*    Install a heat trap above the water heater. This is a simple piping arrangement that prevents hot water from rising up in the pipes, thereby minimizing the potential for this loss.
*    Insulate hot water pipes to reduce heat loss from the pipes themselves. Pipe insulation is available in a variety of materials and thicknesses, with easy application to most hot water pipes. Use insulation with an RSI (insulation value) of at least 0.35 (R-4) over as much of the pipe as you can easily access.
*    Place the water heater over a layer of rigid thermal insulation to reduce heat loss through the bottom of the tank. This is particularly applicable to electric water heaters and external storage tanks for integrated space and water-heating systems.
*    Buy a tank with bottom inlet of cold water
  Before carrying out any of these steps, check with your local installer or electricity utility representative to ensure that you will not compromise the safety or operation of the appliance.
 
Electric water heater. Turn off your water heater at the electric breaker panel if you are going to be away for more than a few days. If it is a natural gas water heater, turn it down but not off.
 
 
 

 

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