Searched for: +
(1 - 20 of 36)

Pages

document
Lobregt, S. (author), Broeze, J. (author), Infante Ferreira, C.A. (author)
For rapid chilling fresh products we propose the immersion in melting carbon dioxide hydrate crystals, produced at +8 oC and 30 bar. We compare the chilling time of a specific fresh product from 30 to 4 oC making use of a “shock freezer” (2 m/s air velocity, air at -10 oC) and applying a slurry of CO2 hydrate crystals. Furthermore the effect of...
conference paper 2016
document
Zhou, H. (author), Infante Ferreira, C.A. (author)
Hydrate slurry has been reported to be a suitable secondary fluid for refrigeration and air-conditioning systems. The latent heat of CO2 hydrate is 387 kJ/kg under phase equilibrium condition of 7 °C and 30 bar. The utilization of CO2 hydrate slurry in air-conditioning systems is promising in improving the energy efficiency and shifting energy...
conference paper 2016
document
Kabra, Abhishek (author), Becker, T. (author), Wang, M. (author), Infante Ferreira, C.A. (author), Vlugt, T.J.H. (author)
Force Field based Monte Carlo (MC) simulations are conducted to predict the performance of an absorption heat pump cycle involving NH3/ionic liquid (IL) (refrigerant/absorbent) as working pair. To investigate the thermodynamic performance of the cycle, various properties such as the enthalpy of absorption, heat capacity, and solubility of...
conference paper 2017
document
Shi, Liang (author), Infante Ferreira, C.A. (author), Gerritsen, Jan (author), Kalkman, Hendrine (author)
CO2 is a promising refrigerant compared to traditional HFCs due to its insignificant global warming potential and nonthreatening to the ozone layer. It has been used as refrigerant in industrial and commercial refrigeration in recent years. With high compactness and the ability to recover heat, CO2 booster systems have been widely installed in...
conference paper 2017
document
Gudjonsdottir, V. (author), Infante Ferreira, C.A. (author)
Couple of models have been developed to calculate thermodynamic properties of NH3-CO2-H2O systems. These models are typically an equation of state for the vapor phase and an activity coefficient model for the liquid phase (Que & Chen, 2011). The activity coefficient models can be divided into three groups based on previous studies, Pitzer...
conference paper 2016
document
Pineda Quijano, Diego (author), Infante Ferreira, C.A. (author), Duivenvoorden, Wil (author), Mieog, Juriaan (author), van der Noortgaete, Tom (author), van Velpen, Bart (author)
The recovery of cold energy during the regasification of Liquefied Natural Gas (LNG) has gained attention in recent years due to the fast growth of the LNG trade market and the increasing importance that governments are giving to energy efficiency and sustainability. Near 200 kWh/ton of LNG are potentially recoverable during the regasification...
conference paper 2017
document
Shi, Liang (author), Gudjonsdottir, V. (author), Infante Ferreira, C.A. (author), Rexwinkel, Glenn (author), Kiss, Anton A. (author)
Compression resorption heat pumps (CRHP) are a promising option to upgrade waste heat from industry. Alternative working fluids can further improve the efficiency of CRHP. The ternary mixture NH3-CO2-H2O has been identified as a promising working fluid for CRHP and has the potential to further enhance the coefficient of performance (COP) of the...
conference paper 2017
document
Wang, M. (author), Infante Ferreira, C.A. (author)
This paper describes a properties-optimization work for the working fluids in NH3 / ionic liquid (ILs) based single-effect absorption heat pumps. The optimum parameters of the IL can be used as criteria in screening task-specified ILs, which play the role of absorbents, in absorption heat pumps. First, a 8-parameter thermodynamic model to...
conference paper 2016
document
Rasooli, A. (author), Itard, L.C.M. (author), Infante Ferreira, C.A. (author)
Large deviations observed between the actual and theoretical gas consumption in Dutch dwellings, cast a shadow of doubt on the accuracy of the energy labeling method. In this sense, the accuracy of the calculation methods as well as the inputs being fed, fall under the question. According to several studies, the significance of wall’s thermal...
conference paper 2016
document
Ezzahiri, Sidi Mohamed (author), Nasif, Badia S. (author), Krieg, Jan (author), Bakker, Anco (author), Infante Ferreira, C.A. (author)
The search for renewable energy sources is a wide area in which significant progress is still expected. This paper focuses on an energy system that uses Fresnel lenses to concentrate sunlight on a tubing system to heat up the working fluid. Fresnel lenses are lighter, thinner and cheaper to build than ordinary lenses. The model is designed to be...
conference paper 2017
document
Wang, M. (author), Infante Ferreira, C.A. (author)
Ionic liquids (ILs), as novel absorbents, draw considerable attention for their potential roles in replacing H2O or LiBr aqueous solutions in conventional NH3/H2O or H2O/LiBr absorption chiller or heat pump cycles. In this paper, NH3/IL working pairs are proposed for implementation in parallel double effect heat pump systems. To investigate...
conference paper 2017
document
Pineda Quijano, Diego (author), van der Pal, Michel (author), Infante Ferreira, C.A. (author), Boer, de, Robert (author), Vollenbroek, Jasper (author)
The last step in the production of milk powder is drying, an energy intensive process that demands 30% to 40% of the total energy input of a typical plant. It takes place in Spray Dryers (SD), where concentrated milk is sprayed and placed in direct contact with hot and dry air that cools down and gains humidity as water is evaporated from milk....
conference paper 2017
document
Tao, Xuan (author), Infante Ferreira, C.A. (author)
High concentration NH3/H2O is suitable for Kalina cycles used for the recovery of low grade heat. Plate heat exchangers (PHEs) are compact and reduce the charge of working fluid. This work investigates the absorption of NH3/H2O in a PHE, which has a weight concentration of 96%. Being different from normal absorption systems, the concentration...
conference paper 2021
document
Knepper, S. (author), Pothof, I.W.M. (author), Itard, L.C.M. (author), Infante Ferreira, C.A. (author)
A comparative study for a representative case district in the Netherlands with around 2500 dwellings has been executed with the purpose of identifying the best solution for a Low Temperature District Heating (LTDH) with Low Temperature Geothermal Heat (LTGH) as the main heat source. The district is presently connected to the Dutch gas network....
conference paper 2021
document
Avadhani, M. (author), van Rooyen, Roland (author), Infante Ferreira, C.A. (author)
Buildings consume 40% of the total global energy and contribute to over 30% of all CO2 emissions. Space heating forms a significant part of energy consumption in buildings. A possible solution is to recover waste heat from sewage and to upgrade its exergy using a heat pump. Polymers reduce cost and energy required for manufacturing the heat...
conference paper 2021
document
Wagenaar, S. (author), Infante Ferreira, C.A. (author)
Within the agriculture sector, drying of food and flowering products is a required production step. Most companies use hot air dryers where the heat is obtained by combustion of natural gas. This paper proposes a heat pump assisted drying system as an alternative. Flower bulb carrying boxes containing just harvested products have been...
conference paper 2021
document
Remmelts, J.J.R. (author), Tensen, S.C. (author), Infante Ferreira, C.A. (author)
Seasonal thermal energy storage (STES) systems in combination with heat pumps can significantly reduce the impact of peak loads in large scale district heating systems and allow for the application of renewable heat sources in these networks. This paper investigates technologies with the highest potential for implementation in large scale...
conference paper 2021
document
Infante Ferreira, C.A. (author)
doctoral thesis 1985
document
Gudjonsdottir, V. (author), Infante Ferreira, C.A. (author), Rexwinkel, G. (author), Kiss, AA (author)
Upgrading waste heat by compression resorption heat pumps (CRHP) has the potential to make a strong impact in industry. The efficiency of CRHP can be further improved by using alternative working fluids. In this work, the addition of carbon dioxide to aqueous ammonia solutions for application in CRHP is investigated. The previously published...
journal article 2017
document
Mosaffa, A. H. (author), Farshi, L. Garousi (author), Infante Ferreira, C.A. (author), Rosen, M. A. (author)
Exergoeconomic and environmental analyses are presented for two CO<sub>2</sub>/NH<sub>3</sub> cascade refrigeration systems equipped with (1) two flash tanks and (2) a flash tank along with a flash intercooler with indirect subcooler. A comparative study is performed for the proposed systems, and optimal values of operating parameters of the...
journal article 2016
Searched for: +
(1 - 20 of 36)

Pages