Combined heat and power, optimal power scheduling, multifamily residences, historical demand.Combined heat and power (CHP) systems are increasingly used in conjunction with traditional grid power for industrial and residential applications. Because many multi-family residences in the US have significant energy savings potential, this study considers a CHP application for an all-electric120-unit multi-family residence in Columbus, Ohio. This building is data rich, with historical consumption of electricity and water available from unit-level meters. ACHP system is considered to meet partial loads for electricity and hot water in order to reduce overall energy cost, when considering a demand sensitive grid power cost pricing schedule. A mathematical model is developed for deploying the CHP and dispatching the generated electric power to the facility and thermal energy to a central hot water tank. This model enables optimal management of the power dispatching in order to reduce overall energy cost. The modelingresults indicate that a CHP with electrical output of 60 kweand a hot-water tank capable of storing 400 kwh of thermal energy will optimally reduce total annual energy costs for the multi-family residence. In this case, the total annual cost is reduced by 23% relative to using only conventional grid power for the building, from $114,850 to $88,336, and the CHP provides 65% of the total demand.Reduction in total carbon emissions for this best case is estimated to be 32%.
…………………………………………………………………………………………………….... Introduction:-Multi-family housing energy consumption represents a significant fraction of the total residential energy consumption in the US, where one-third of the population lives in a half a million multi-family buildings [1]. In addition, these buildings are frequentlyenergy inefficient. A recent study documents that rental multi-family residences have much higher energy use intensities (EUI), measured on a per-foot basis,than other categories of housing [2]. However, this is partly due to the smaller size of multi-family apartments. When measured on a perhousehold basis, researchers report thatmulti-family housing uses the least amount of energy [3]. Multi-family units tend to have fewer efficiency upgrades than owner-occupied dwellings, andrenters who do not pay utilities directly use an estimated 30% more energy for heating than renters who pay their own utilities [4]. Furthermore, even when renters directly pay theirown utility costs, the building owners lack incentive to invest in efficiency improvements. This problem is referred to as the split incentive barrier, and it contributes to the efficiency gap formulti-family housing [5].