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To address the rising demand in cloud infrastructure, we present a DC Energy and Water Information Simulator and Evaluator: DC E-WISE. DC E-WISE is an Excel-based tool developed for key stakeholders and utilities to evaluate the water and energy savings associated with cooling system selection and air-flow management in future and existing DCs. The tool is specific to the Phoenix area and models water cooled and air cooled chiller systems and adiabatic cooling with and without economization (total of nine permutations) and the potential for onsite water reuse. The tool has the capability of:
  • Estimating DC heat loads
  • Calculating water and energy consumption in DCs
  • Summarizing onsite water reuse options with membrane processes and reporting their technical and economic performance
  • Recommending “optimal” cooling system and aisle configuration based on stakeholder preference (i.e., water use, energy use, reliability, and maintenance) and resource availability

dc-e-wise-water_reuse_ver_1.3_user_manual.docx
File Size: 3727 kb
File Type: docx
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dc_e-wise_ver_1.3-feb_2026.xlsm
File Size: 1944 kb
File Type: xlsm
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Last updated: February 3, 2026​
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Summary of Tool Updates

Version
Date Updated
Summary of Updates
ver_1.3
Feb. 3, 2026
  • Presentation of results enhanced, with graphical outputs displayed in a dedicated tab.
  • Sources of heat generation in IT room (e.g., lighting, occupancy, UPS and PDU) included.
  • Cooling load safety factor included.
  • UPS and PDU efficiencies now calculated using an oversizing factor to support part-load efficiency evaluation and improve user convenience.
  • Water reuse modeling updated to include an option for onsite treatment with nanofiltration.
ver_1.2
Aug. 11, 2025
  • Updated meteorological data from Hands Down Software.
  • Updated chiller capacity and performance curve coefficients.
  • Adjusted supply air temperature and chiller setpoints.
  • Revised cycle of concentration (CoC) for cooling towers.
  • Water recirculation included in evaporative cooling systems.