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An example of "before" and "after" AEC delievered savings ... |
Download this example  (147kB pdf) |
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 The chart on the right illustrates a mass of data logged over three days showing common flow and return temperatures, individual boiler flow and two variable temperature circuits, domestic hot water, outside air and the chilling flow and return temperatures. Click the image to view.There are a number of clear issues visible from this data where improvements will lead to greater energy efficiency.  Improve stability of the boilers With over a 20ºC range in the boiler temperatures there is massive instability and potential damage to the boiler as well as the threat of condensates building up.   Zone Control Both of these zones are "variable temperature, i.e. they should react to the demand for heating which is ultimately governed by the outside air temperature. From this chart it can be seen that the "south" zone is not moving at all and that the "north" zone is very unstable and the variations appear bare no relationship with outside air or any other temperatures.   Boiler sequencing
This data was taken in summer, the outside air temperatures are well up at expected maximums, for most of the time the only heat requirement is for domestic hot water, by ensuring that only as many boilers fire to satisfy actual demand significant savings will be achieved.  The net result, as can be seen from the boiler firing data is that boiler firing time was reduces from 22% of the time to 7% of the time, suggesting in excess of 60% savings, however because this exercise was undertaken in the summer when heating demand was low we would expect grater savings so we would comfortably be able to predict a 30% annual gas saving at this site. |
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