Benefits of improving energy efficiency

I was fortunate to have been the construction and environmental manager for one of the largest conversions from No. 6 oil to natural gas in N.Y.C. yet. Three large boilers, providing heat and domestic hot water for eight large apartment buildings and other areas, were upgraded in preparation for the fuel switch. It is now two years since the switch was implemented, and I was asked to estimate cost savings for these two years compared to the last two full years of full No. 6 oil service to determine cost savings. Well, between the improvement in thermal efficiency and the price difference between natural gas and oil, the building owners saved millions of dollars per year compared to before the switch, despite the fact these last two winters were colder than the earlier two under No. 6 oil (6% higher heat demand in terms of heating degree-days)! The payback for this multi-million dollar project will be under three years. It has been hailed a success. But it turns out that the client has achieved other unanticipated benefits. By switching from No. 6 oil combustion only to natural gas with No. 2 oil as a backup, they have much fewer oil deliveries. Before the project, the boilers were combusting over 2 million gallons of No. 6 oil per year. Trucks used to travel through the narrow neighborhood streets as many as 300 times per year. Every time a truck arrived some workers at the boiler house had to stop their tasks and help the truck driver load the storage tanks. Now with No. 2 oil as a backup, in the first year of operation there were only two truck trips all year! Only twice workers were interrupted from other matters to help unload. From nearly 300 interruptions to two. So stress has gone down and productivity up. Plus, boiler house maintenance costs and time devoted to it have decreased. Natural gas is easier to manage compared to thick No. 6 fuel oil, which itself has to be heated just to flow. Pumps, valves, and other equipment had been taken out of service and cleaned and serviced more than they are now, improving efficiency among the staff. The new automated control system also has saved the client time. Finally, the switch to natural gas substantially reduced the risk of a calamity. There was a risk of No. 6 fuel oil leaking from some overburdened piece of equipment, causing preparation for such an event and the potential tremendous cost involved in removing and cleaning this viscous fuel. Now with little No. 2 fuel oil stored and a new modern tank farm, the risk of a spill and the potential cost if one were to occur are both very low. East River Housing's switch to natural gas has been a big financial winner for them, not only in terms of efficiency and cost savings, but also in terms of these less visible gains in operational improvements. CCES has the experts to help you evaluate all of the advantages of a fuel switch or other boiler upgrade to save you money and aggravation, as well as to manage its implementation. Contact us today at [email protected] or at 914-584-6720. Marc Karell, P.E., CEM, EBCP, is the president of Climate Change & Environmental Services, LLC, Mamaroneck, N.Y.