Analysis and optimization of subcritical two-stage vapor injection heat pump systems
| Autor: | Miquel Pitarch, Emilio Navarro-Peris, José M. Corberán, José Gonzálvez-Maciá, A. Redón |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Optimization
Heat pump Work (thermodynamics) Engineering business.industry Mechanical Engineering Thermodynamics Two-stage Building and Construction Management Monitoring Policy and Law Coefficient of performance Subcritical Vapor injection law.invention General Energy law FISICA APLICADA MAQUINAS Y MOTORES TERMICOS Stage (hydrology) Process engineering business Analysis |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1016/j.apenergy.2014.02.066 |
| Popis: | Two of the major problems of heat pump systems working in extreme conditions are the loss of efficiency of the system and the high compressor discharge temperatures. One possibility in order to overcome these issues is to perform the compression in two stages. In this frame the use of vapor injection two stage cycles represent an economic and effective solution. This study analyzes the influence of design parameters and injection conditions for two different configurations of two stage cycles, for four refrigerants (R407C, R290, R22 and R32). Design parameters, such as the displacement ratio, are optimized in terms of COP in ideal conditions for both injection systems. A deeper analysis taking into account the efficiencies of the compressor is done finding that two stage systems could reach improvements of 30% in terms of COP compared with one stage systems and that a bad design of this type of systems could represent a loss of improvement between 6% and 10%. Finally a method to control the system at any operating point in order to make it works in its optimum is done. From all the analysis, guidelines for the optimum design and control of such systems are obtained in terms of capacity, Coefficient of Performance (COP), seasonal performance factor and discharge temperature criteria. This work has been partially supported by the Spanish Ministerio de Economia y Competitividad through the project rsf. DPI 2011-26771-C02-01. The authors are grateful for the given support. |
| Databáze: | OpenAIRE |
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