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Your search keyword '"Dhillon, Parveen"' showing total 2 results
Start Over Author "Dhillon, Parveen" Topic air conditioning
2 results on '"Dhillon, Parveen"'

1. Validation of a Load-Based Testing Method for Characterizing Residential Air-Conditioner Performance

Author

Dhillon, Parveen, Welch, Drew, Butler, Brian, Horton, W. Travis, and Braun, James E.

Subjects
Load-based Testing, Field Testing, Air Conditioning, Heat Pump, Dynamic Performance
Abstract

Seasonal performance assessments of air-conditioning and heat-pump systems are typically carried out based on performance measurement of equipment in a test laboratory. The performance ratings that arise from these assessments are important in providing information to consumers, and in influencing policymakers to determine appropriate incentives for high-efficiency equipment in the marketplace. The current testing and rating approach for performance evaluation of residential air-conditioning and heat-pump systems is based on steady-state performance measurements, with a degradation coefficient to account for the cycling losses that occur during part-load operating conditions. However, this current methodology fails to appropriately characterize the true performance characteristics of these systems in the field, and as a consequence, SEER (seasonal energy efficiency ratio) improvements have not resulted in proportional savings in energy. As an alternative, a load-based testing methodology has been developed with the motivation of capturing realistic equipment performance in a laboratory setting while operating similar to field application conditions. In this approach, the equipment responds to a simulated virtual building load, and the system dynamic performance is measured with its integrated controls and thermostat. However, there is a lack of field-testing data to characterize how well the load-based testing approach captures equipment performance and dynamic behavior compared to a typical field application. To fill this gap, a 3-ton heat pump system was tested within the Residential Home Ecosystem at the Helix Innovation Center where a 2-story house is located within an environmental chamber that can vary external ambient temperature and humidity conditions. During tests, the house was subjected to cooling loads resulting from different outdoor temperature conditions, and its air conditioning system responded accordingly. Similar cooling equipment was also tested within psychrometric chambers at the Ray W. Herrick Laboratories using the load-based testing methodology. A comparison of the test equipment performance and its dynamic behavior in cooling mode between testing performed at the Helix Center and at the Herrick Laboratories is presented in this paper.

Published
2021

2. Repeatability Assessment of Load-Based Testing Methodology for Residential Air Conditioning Equipment.

Author

Dhillon, Parveen, Kim, Dohyeon, Horton, W. Travis, and Braun, James E.

Subjects
*COOLING systems, *AIR conditioning, *TEMPERATURE control equipment, *STRUCTURAL dynamics, *STATISTICAL reliability, *HEAT pumps
Abstract

Current rating standards for residential, electric-driven vapor compression systems determine seasonal energy efficiency (e.g., SEER) using a bin method along with equipment performance data from steady-state tests at different operating conditions. These standards were originally developed for equipment with single or two-stage thermostat control but have been incrementally updated to include equipment with advanced controls and variable-speed compressors and fans. However, the controls are overridden during equipment testing and therefore the rated performance does not consider the interaction of the integrated controls, equipment, and building dynamics. As a result, the standard ratings do not fully capture the characteristics of part-load operation and do not necessarily reward equipment with superior controllers. To address these issues, a load-based testing methodology has recently been developed for estimating the seasonal performance of variable-capacity cooling and heating equipment. The load-based testing methodology emulates the response of building sensible and latent loads to the equipment controls in a psychrometric test chamber by continuously updating the room temperature and humidity based on a virtual building model. The test unit thermostat naturally responds to the dynamic temperature variation and controls the equipment capacity in response to a deviation from its setpoint. The test unit thermostat is installed in a thermostat environment emulator to provide a standardized environment to the thermostat in order to ensure realistic and reproducible conditions for the thermostat. This enables the load-based testing procedure to capture realistic control interactions and performance of a heat pump in a laboratory using psychrometric test chambers. However, to adopt the developed methodology for nextgeneration rating standards, it is crucial to assess the repeatability and reproducibility of the load-based testing approach. In this paper, the assessment of the repeatability of the load-based testing methodology for a 3-ton variable-speed heat-pump operating in cooling mode is presented. The test unit performance was measured multiple times in the same psychrometric facility based on the load-based testing approach. A comparison of the test equipment estimated seasonal performance for different sets of tests is presented along with a discussion of the causes for the differences. [ABSTRACT FROM AUTHOR]

Published
2022

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