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Auditing, Planning, and Retrofitting
Published in Stan Harbuck, Donna Harbuck, Residential Energy Auditing and Improvement, 2021
There are two different types of balanced air-to-air heat exchangers. A heat recovery ventilator (HRV) uses only a heat exchanger to avoid energy losses. An energy recovery ventilator (ERV), Figure 7-112) uses both a heat exchanger and a process of recovering latent heat contained in moisture as well. This is sometimes referred to as an enthalpy exchange system. Thus, a good ERV will reduce energy losses better than an HRV. Good ERVs and HRVs that use a counter flow or countercurrent heat exchanger can have heat exchanger efficiencies of up to 95%—in other words, these ventilation systems can recover up to 95% of the heat that would otherwise be lost if the air were simply exhausted to the outside. In some advanced systems like this, using an energy efficient motor can save 8 to 15 times the energy used by the fan motors.
Fans
Published in Neil Petchers, Combined Heating, Cooling & Power Handbook: Technologies & Applications, 2020
Fans are volumetric machines that move quantities of air (or other gases), overcoming resistance to flow by supplying the energy necessary for continued motion. Fans are similar in many respects to pumps and compressors. All three are turbomachines that transfer energy to a flowing fluid. While fans are easily distinguished from pumps (which handle liquids), distinctions between fans and compressors are not so clearly defined. Historically, distinctions have been made on the basis of compression ratio or density change. For most purposes, low-pressure-rise machines may be classified as fans and high-pressure-rise machines may be classified as compressors. A broad distinction is that the function of a compressor is generally to increase pressure, whereas fans are generally used to propel the air or gas.
Electrical Energy Management
Published in Anil Kumar, Om Prakash, Prashant Singh Chauhan, Samsher, Energy Management, 2020
Anil Kumar, Om Prakash, Prashant Singh Chauhan, Samsher
Fans supply air to ventilate and for other processes required by the industry. Fans operate by generating pressure and creating the movement of air as opposed to the resistance offered by the ducts and dampers. The fan receives its energy from the transmitting shaft of the rotor, which supplies it to the air.The difference in fan compressor and blowersThe man difference associated with both devices is how the movement of air happens and by the system pressure they must operate against. ASME rules state that the discharge ratio to the suction pressure is used for the evaluation of the fans and blower. The rise in pressure for a fan is around 1136 mmWg. For blowers, it is from 1136 to 2066 mmWg, and in the case of compressors, it is more than the blowers.
Demand Side Management based techno-economic performance analysis for a stand-alone hybrid renewable energy system of India
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Mala Ramesh, Rajeshwer Prasad Saini
The strategic conservation method is basically to minimize the load by lowering the ratings of the various electrical appliances by replacing inefficient appliances with energy-efficient appliances. This method considers three different ratings based on the cost of the devices viz: high rating low cost (HRLC), medium rating medium cost (MRMC), and low rating high cost (LRHC). The particulars of ratings of appliances used for domestic, commercial, and community sectors are given in Table 2. The different lamps used are as fluorescent lamps (FL), compact fluorescent lamps (CFL), and light-emitting diode (LED). The different fans used are normal fans, medium energy efficient (MEE) fans, and high energy efficient (HEE) fans. Similarly, the different TV’s are cathode ray tube (CRT), liquid crystal display (LCD), and LED. The daily load curves with DSM for summer, rainy, and winter are shown in Figures 5–7 respectively. Optimization is accomplished with Lead Acid and Li-Ion batteries under LF, CC, and CD strategies.
Numerical and experimental study of a reversible axial flow fan
Published in International Journal of Computational Fluid Dynamics, 2020
Mohamad Abdolmaleki, Esmaeil Mohammadian Bishe, Hossein Afshin, Bijan Farhanieh
Based on the ISO-13349 standard, a fan is arotary-bladed machine that receives mechanical energy and utilizes it by means of one or more impellers fitted with blades to maintain a continuous flow of air or other gas passing through it and whose work per unit mass does not normally exceed 25 kJ/kg. (EN ISO 13349:20102010)
Development of an efficiency model for electronically commutated motor fan systems in air handling units
Published in Science and Technology for the Built Environment, 2020
Zufen Wang, Zhitao Han, Li Ding, Gang Wang
The ideal fan efficiency () is the fan efficiency () obtained using the affinity laws from the operating data at the rated motor speed by curve fitting and is still a function of the ratio of fan head to fan airflow rate squared independent with the motor speed.