Technology Advances and Energy Savings Available

Technology Advances and Energy Savings Available - juliawriter - technology-advances-and-energy-savings-available-235.jpg
Member Since:
May 2, 2014
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Since the beginning ofthe century the U.S. Department of Energy produced the Buildings Energy DataBook, the current edition is at 2011, where it has put together statistics of
the energy used both commercially and residentially. It shows that not only hasthe demand for electricity more than doubled from 1980 to 2010 but thebuildings sector account for 75% of it. Heating, Ventilation and AirConditioning systems account for the large part of this energy use, also takingup 43% of the residential energy used. The U.S. Department of Energy Star
Program consider that in the residential sector if the temperature is set 8oFahrenheit during the phases of the day when the family is not present then 5%to 15% of the fuel cost can be saved. A useful statistic out of this is that ifthe temperature is set back 1oF for at least eight hours then atleast 1% of the fuel cost will get saved.

This one saving can bemade out of simply buying a programmable thermostat and setting it accordingly.

A 5% to 15% saving canbe made in buildings by having the boiler controlled by Energy ManagementSystems (EMS) or Building Management Systems (BMS), which through a set oftemperature sensors throughout the building will feed data to a computer, which
will then work out the optimum boiler firing time.

However the singlemost idea that will produce those savings again will be by employing the use ofmulti-zoning.

Instead of treatingthe whole building as one zone that needs to be heated, split it up into
logical units that are likely to require different heating requirements atdifferent times of the day, or at different days of the week. This can simplybe done in two zones by separating logically the half of the building that mayget most of the heat from the sun and the other half which is mostly shaded. Bytreating these as two distinct zones that require different heating or cooling then the HVAC systembecomes much more efficient. Ideally, however large buildings will get splitinto several zones which requires the expertise of a heating engineer whounderstand the complexities. It is feasible to get 20% extra efficiency out ofthe HVAC system.

So to sum up and goingback to the results of the Energy Star Program, the savings that can be made byeach of the initiatives if they were done in isolation.

* All roundfull maintenance of the heating and hot water system, cleaned and efficiency
tested. 20%.

* Simplyadding radiator shut off valves and having thermostatic control over them. 3%

* Investingin an EMS or BMS that for heating takes into account the temperature indoors.
15% to 25%

* Multi-zoningwith using one of the above systems. 20%+

* For smallbuildings just using a programmable thermostat. 15%

There are a number ofother suggestions that can provide variable savings depending on the situation.

* Buying andusing a permanent stack thermometer, a water meter and temperature sensor.

* Adding a sensorto the control pump regulating the temperature of the water going through it.

* Optimallysized radiators calculated for the best efficient heating for the size and
shape of room.

* Fillingand caulking any holes in windows, doors and walls.

* Going fromsingle to double glazing that has low emissivity and filled with inert gas.

At a time when energycosts are rising together with the need for more energy we must turn to acombination of systems to enable us to keep it under control. Also the hardware
costs of maintaining and upgrading equipment can be kept at its most effectiveby keeping good control over the temperature and depending on the componentsmassive savings can be gained long term. Even beyond budgetary reasons there isalso the comfort of people within the buildings to consider, having the luxuryof more control over their environment.
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