Energy Savings
Two Methods of Calculating Potential Energy Savings
and Payback
Engineering Study - This method is done by an elaborate software program where an engineer enters the name plate KW of all energy consuming equipment (lighting, HVAC & base load) along with the present operating parameters, building envelope and energy costs. Once this done, they enter the conservation strategies to be implemented and the program provides you a detailed energy savings report. This study typically cost between $20,000 to $30,000 and Xencom only provides this study after the customer signs a letter of intent to either purchase the EMS from Xencom (if the agreeable paybacks can be met) or the customer agrees to pay for the study.
Estimated Savings Projections - This is the savings report and payback projections we typically provide our customers. We use our 20+ years of experience to look at existing operations and how energy is being used. We then enter this information into our database of over 100 malls and see how it compares to similar malls energy use (see chart below). We then compare the mall to similar mall where we installed EMS systems (before & after) to come up with our best estimate on energy savings. Because of the importance of achieving these estimated paybacks (for future business), we track the energy usage after the installation of the EMS systems. We typically find that the actual savings exceed our projections.
| Sector | % of Bill |
| Tenant Power | 50% |
| Mall Lighting | 7% |
| Parking Lot Lights | 2% |
| Mall HVAC | 11% |
| Tenant HVAC | 30% |
Where is the Energy being Used?
Before you can calculate energy saving you first must define were the energy is being used and what part can be control. If its common area only then the majority of the load is controlled. But many of the malls that have our EMS systems redistribute energy to the tenants. Below is an average breakdown where energy is being used.
