Authors:

Seyed Kiarash Mossalaei

Date Created:

Not specified

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About Paper:

In the United States, 40% of the total energy is consumed by commercial and residential buildings, of which cooling and heating account for a significant portion. Improving heating, ventilation, and air conditioning (HVAC) systems' energy efficiency is imperative for sustainability and decarbonization. The current HVAC systems testing methodologies, e.g., AHRI 210/240, lacks procedures to account for various components of modern equipment such as economizer, variability of fan speeds, and the manufacturer's native controls in the performance rating. Developing an improved testing methodology measuring the overall performance of equipment is key in improving HVAC systems performance, as it motivates manufacturers to develop energy- efficient products. The load-based testing methodology aims to achieve this goal by assessing the overall performance of HVAC systems with their integrated controls using a virtual building model. For a rooftop unit (RTU), the load-based methodology uses two psychrometric chambers allowing the integrated controls to naturally react to the dynamic changes of temperature and moisture emulated by a virtual building model. A closed-looped apparatus (CLA) is being developed for testing residential units mimicking the function of the psychometric room for the indoor unit while the outdoor unit is set up in a psychrometric chamber. The CLA will allow testing of multiple units simultaneously, reducing the overall testing time. A thermostat environment emulator (TEE) was constructed to improve the reproducibility of the methodology at different labs by providing a controlled environment for the thermostat. This study investigates load-based testing methodology for residential and commercial equipment for further assessment and improvement.

Source:

Purdue University / 2023

Topics:

No topics listed

Co-authors:

Seyed Kiarash Mossalaei