Yashar David (6 results)

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000.

HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Condition: New. Print on Demand. This book presents a novel device for controlling the flow rate of refrigerant in vapor compression systems for air conditioning and heat pumps. The device is based on the novel concept of a microfluidic actuator that moves an obstruction into and out of the refrigerant flow. The actuator consists of two parts bonded together. The first part consists of a thin membrane with a piston fixed to it. The second part is a device containing a port slightly larger than the diameter of the piston. The port allows the piston to pass through and interact with fluid on the opposite side of this part. As thermal energy is added into an oil reservoir from a heater, the oil gets warmer and its density decreases. This expanding oil exerts pressure on the thin flexible membrane, which results in the membrane flexing outward. This movement pushes the flow obstruction into the refrigerant flow passage. The author explores the design, fabrication, and testing of this device, providing a comprehensive understanding of its operation and potential applications. The book discusses the need for a variable expansion device in refrigerant systems, reviews existing microfabricated fluidic valves, and presents the design concept of the proposed device. It details the fabrication processes, characterization methods, and performance evaluation of prototype devices, providing valuable insights into the challenges and opportunities associated with the development of such devices. By combining insights from materials science, fluid mechanics, and microfabrication, this book offers a unique perspective on the development of microfluidic devices for controlling refrigerant flow. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Paperback. Condition: new. Paperback. This study demonstrates the performance improvement of an air-to-air roof top unit (RTU) achieved by optimizing an evaporator's refrigerant circuitry using evolutionary algorithms. The subject of this study is a unit with a cooling capacity of 7.5 Tons (26.4 kW). The RTU employs two separate refrigerant cycles having separate compressors, condensers, and thermostatic expansion valves (TXV) but using a single evaporator slab in which two separate refrigerant circuits are implemented. This item is printed on demand. Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.