Multiple Zone Variable Refrigerant Flow System Modeling And Equipment Performance Mapping
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| Release | : 2012 |
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We developed a variable refrigerant flow (VRF) vapor compression system model, which has five indoor units, one outdoor unit and one water heater. The VRF system can run simultaneous space conditioning (cooling or heating) and water heating. The indoor units and outdoor unit use fin- & -tube coil heat exchangers, and the water heater uses a tube-in-tube heat exchanger. The fin- & -tube coil heat exchangers are modeled using a segment-by-segment approach and the tube-in-tube water heater is modeled using a phase-by-phase approach. The compressor used is a variable-speed rotary design. We calibrated our model against a manufacturer s product literature. Based on the vapor compression system model, we investigated the methodology for generating VRF equipment performance maps, which can be used for energy simulations in TRNSYS and EnergyPlus, etc. In the study, the major independent variables for mapping are identified and the deviations between the simplified performance map and the actual equipment system simulation are quantified.
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| Release | : 2013 |
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We developed a detailed steady-state system model, to simulate the performance of an integrated five-zone variable refrigerant flow (VRF)heat pump system. The system is multi-functional, capable of space cooling, space heating, combined space cooling and water heating, and dedicated water heating. Methods were developed to map the VRF performance in each mode, based on the abundant data produced by the equipment system model. The performance maps were used in TRNSYS annual energy simulations. Using TRNSYS, we have successfully setup and run cases for a multiple-split, VRF heat pump and dehumidifier combination in 5-zone houses in 5 climates that control indoor dry-bulb temperature and relative humidity. We compared the calculated energy consumptions for the VRF heat pump against that of a baseline central air source heat pump, coupled with electric water heating and the standalone dehumidifiers. In addition, we investigated multiple control scenarios for the VRF heat pump, i.e. on/off control, variable indoor air flow rate, and using different zone temperature setting schedules, etc. The energy savings for the multiple scenarios were assessed.
| Author | : Napoleon Enteria |
| Publisher | : Springer Nature |
| Total Pages | : 251 |
| Release | : 2023-01-31 |
| Genre | : Science |
| ISBN | : 9811968330 |
This book compiles the latest research, development, and application of VRF systems with contributions from various experts who pioneered and contributed to the development of the VRF system. This book presents the fundamental issues related to the real application and behaviour of the VRF system based on the long-term monitoring of the installed system. With our experience of pandemic which COVID-19 is an airborne, the spread of the virus is very fast. With this, the heating, ventilating and air-conditioning (HVAC) system is a major player in the maintenance and control of indoor environment to minimize the spread of the virus. As the variable refrigerant flow (VRF) system is a versatile HVAC system in which it can operate at different conditions, the application of the VRF system is very important to control the indoor environmental conditions. Thus, the publication of this book is important with the present situation and the future possible situation which the control of indoor spaces is very important. With this, this book will serve as a reference for building designer, contractors, building regulators and students.
| Author | : Mitsubishi Electric Catalog |
| Publisher | : Ammunition Agency |
| Total Pages | : 129 |
| Release | : 2019-07-01 |
| Genre | : Reference |
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When it comes to providing personalized comfort in every room of every building, we are here to help. No other company is as committed to creating environmentally friendly and affordable HVAC zoning technology that's ideal for today's home and work environments, no matter the size or shape. Get the CITY MULTI® catalog to learn more about our applied Variable Refrigerant Flow products and solutions.
| Author | : Air-Conditioning, Heating, and Refrigeration Institute |
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| Total Pages | : 176 |
| Release | : 2010 |
| Genre | : Air conditioning |
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| Author | : Paul Wicoff |
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| Release | : 2010 |
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This report addresses the operation, use, and design of air-to-air variable refrigerant flow systems, also known as VRF. Relatively new to the United States, these HVAC systems have potential to reduce energy consumption and utility costs in the correct applications. Although useful in many applications, the best building types for VRF are those requiring a large number of zones and with low ventilation air requirements. The report explains design and system selection considerations and accordingly presents two flowcharts to help designers implement this system. To show how the system compares to traditional technologies in terms of efficiency and cost, the report presents results from several studies comparing VRF to other systems. In addition, an energy modeling study is conducted to clarify the effect of climate on the system; this study established air-to-air VRF as having highest energy consumption in dry, southern climates, based on energy use and operating costs. With this report, HVAC designers can learn when air-to-air VRF is an acceptable method for providing heating and cooling in a building.
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| Total Pages | : 692 |
| Release | : 1995 |
| Genre | : Aeronautics |
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| Total Pages | : 1948 |
| Release | : 1997 |
| Genre | : Electrical engineering |
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| Author | : Florida Building Commission |
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| Release | : 2020-07 |
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| ISBN | : 9781952468179 |
The 7th Edition (2020) update to the Florida Building Code: Energy Conservation is a fully integrated publication that updates the 6th Edition 2017 Florida Building Code: Energy Conservation using the latest changes to the 2018 International Energy Conservation Code® with customized amendments adopted statewide. Chapter tabs are also included. Effective Date: December 31, 2020
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| Total Pages | : 656 |
| Release | : 2008 |
| Genre | : Refrigeration and refrigerating machinery |
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