Design of Promising Working Fluids for Emergent Combined Cooling, Heating, and Power (CCHP) Systems

Abstract

Combined cooling, heating, and power (CCHP) systems enable the simultaneous supply of electricity, heating, and cooling, thus meeting the major energy needs of humans in a single device. Conventional CCHP systems consist of the combination of a prime mover, heating, and cooling system, each of them operating with a thermodynamically suitable working fluid. Recently, novel CCHP cycles, based on the use of a single working fluid for the whole operation, have been proposed. Since the choice of the working fluid represents a design challenge in the development of such technologies, in this work, a product design approach for the selection of suitable working fluids for emergent CCHP applications is presented. A database search is implemented to screen about 60 000 structures included in the DDB, the Design Institute for Physical Properties, and the NIST TDE databases. The screening considers thermodynamic, process-related, constructional, safety, and environmental constraints. Moreover, the tc-PR equation of state is used to ensure the quality of the calculation of thermophysical properties and the performance assessment of promising working fluids. This study shows that flammable fluids such as vinylacetylene or HFC-152 have a good potential for CCHP applications. In the case of reinforced safety restrictions, HCFO-1233zd(E) seems to be an interesting candidate since it is nonflammable and nontoxic.

Determination of thermal conductivity, thermal diffusivity, and specific heat of liquids using a thermoelectric module

“…A second impedance spectroscopy measurement was performed once soldered (in air, no vacuum) to determine the thermal contact resistance of the new copper block/bottom ceramic interface (r TC,Si ). Figure 3(b) shows the experimental impedance spectrum of the soldered module (dots) and its fitting (line) using equation (1), which is implemented in the MATLAB code provided in the supplementary information. The fitting results can be seen in table 1.…”

“…heating systems, or in refrigeration cycles. In some applications, it is necessary to model the behavior of the fluid and to select the right candidate to design new systems [1]. However, new working fluids are constantly being developed to protect their surroundings from corrosion [2] or to reduce the carbon footprint of their production or operation [3].…”

Configuration Strategy and Performance Analysis of Combined Heat and Power System Integrated with Biomass Gasification, Solid Oxide Fuel Cell, and Steam Power System

“…With the depletion of fossil resources and the increasing issue of environmental pollution, the search for developing an effective, affordable, and environmentally friendly energy system is crucial [1]. Combined heat and power (CHP) systems are increasingly being recognized as an energy-saving and sustainable technology [2]. CHP systems represent an efficient energy utilization approach that can meet various energy demands.…”

Design Green Chemicals by Predicting Vaporization Properties Using Explainable Graph Attention Networks

“…The vaporization properties of working fluids are also closely related to the performance of refrigerating cycles (or heat pumps) 10 that consume ~23 % of residential sector electricity in the United States 11 . Since the Montreal Protocol banned the use of chlorofluorocarbon, there have been constant demands for green working fluids with low global warming and ozone depletion potential 12 .…”