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3 results on '"Krarti, Moncef"'

1. Analysis of Measurement and Verification Methods for Energy Retrofits Applied to Residential Buildings.

Author

Guiterman, Tim and Krarti, Moncef

Subjects
*HOME energy use, *LOW-income housing, *ENERGY conservation, *WATER heaters, *CALIBRATION
Abstract

Thirty low-income housing units located in the high altitude San Luis Valley of Colorado received various energy conservation measures (ECM) in the summer of 2007. Measures included new furnaces, new tankless water heaters, programmable thermostats, addition/repair of roof insulation, existing furnace tune-up (where applicable), CFL bulbs and minor air sealing. Measurement and verification of the energy savings consisted of pre- and post-retrofit walk-through audits, blower door testing and temperature monitoring of select units. Verification methods consist of two whole building approach methods in addition to the calibrated simulation approach, following the ASHRAE Guideline 14-2002 protocols. All three methods are shown to produce remarkably similar savings estimates, with whole building approach methods being the simplest and least costly (time-intensive) to utilize for savings verification. The analysis provides insight into the effectiveness of the various methods as well as the impacts of the ECMs on residential energy consumption [ABSTRACT FROM AUTHOR]

Published
2011

2. Field Testing of Optimal Controls of Passive and Active Thermal Storage.

Author

Morgan, Stephen and Krarti, Moncef

Subjects
*COOLING loads (Mechanical engineering), *CALORIC expenditure, *ELECTRIC power consumption, *ELEMENTARY school facilities
Abstract

This paper summarizes the results of field testing to evaluate the performance of simplified and optimal control strategies for shifting peak cooling loads and reducing building energy costs through the utilization of both the passive and active thermal energy storage systems for an elementary school in Colorado. In particular, the performance of precooling of building thermal mass as well as real-time model-based predictive optimal controls is evaluated. The results indicate that the school is saving roughly 47% on its annual electricity costs by utilizing the TES operated using their optimal control strategy. [ABSTRACT FROM AUTHOR]

Published
2010

3. Analysis of multi-step control strategies for dynamic insulation systems.

Author

Rupp, Shawn and Krarti, Moncef

Subjects
*ENERGY consumption of buildings, *DYNAMICAL systems, *COMMERCIAL building energy consumption, *HEAT, *INSULATING materials, *HEAT transfer
Abstract

• Rule-based controls suitable for dynamic insulation materials are developed. • The controls can save significant energy use for both heating and cooling buildings. • Good correlation is found between heating and cooling degree-days and annual energy savings. Dynamic Insulation Materials (DIMs) present an opportunity to reduce the energy consumption of buildings by allowing heat transfer through the envelope at times when it is beneficial. Studies in the past have investigated a binary R -value control in which the thermal resistance of the wall is either "on" or "off. This study attempts to improve on this control strategy by maximizing the amount of beneficial heat transfer through the envelope using wall surface temperatures, the heating/cooling set-point temperature, and the temperature in the middle of the wall as parameters. It is found that adding a period during which the R -value of the wall can vary continuously within a defined range has the potential to modestly decrease the heating and cooling energy consumption. However, it is found that the most energy savings can be achieved by using a 2-step operation with settings slightly modified from previous studies. For a parametric analysis specific to a residential building in Golden, Colorado, the optimized operation mode produced heating energy savings of 9.3% and cooling energy savings of 21.0% relative to static RSI-3.8 insulation. Moreover, a parametric analysis was conducted to extrapolate the findings to multiple US cities with different climate zones. It is found that the optimized operation mode offers some energy savings for residential buildings in all US climates, though the extent of the savings and the optimized parameters are dependent on climate. Specifically, climates with low cooling degree-days have the potential for a higher reduction of cooling energy up to 35%, while climates with low heating degree-days are found to have the potential for a significant decrease in heating energy of over 80% relative to static insulation. [ABSTRACT FROM AUTHOR]

Published
2019
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