The user has to give some core parameters that describe the cycle/system. The user interfaces in all cycle design Tools have the same general layout. Instead the user can experiment with parameters such as choice of refrigerant, temperature levels, pressure losses, and see how it affects the overall energy efficiency. Cycle design tools do not deal with the actual components. In many cases the overall energy-economics will not benefit from this approach. Instead they find a similar case they (or a colleague) have completed previously. Process design During the design phases of refrigeration systems engineers often rely on rules of thumbs, as they do not have the necessary time to evaluate relevant process designs.
inputs are in sub diagram windows - see for example Figure 3. The main diagram window for a one-stage cycle with DX evaporator. The figure shows the different phases when designing a refrigeration system and the corresponding EES-CoolTool supporting it. All other Selection of cycle and specification of parameters Use of dimensioning criteria Calculation of operating conditions with selected components Energy analysis based on measurements Figure 1. In the main diagram window the only input is the choice of refrigerant. In the process design tools the drawing is a Log(p),h-diagram, see Figure 2, in dimensioning, system simulation and evaluation tools it is a pipe diagram. The main diagram window contains the main outputs and a drawing that identifies the process. User interface The user interface for all EES- CoolTools has the same principal layout - a main diagram window with one or more sub diagrams. It is the intention that the remaining of the Dimensioning-, System Analysisand Evaluation tools corresponding to the 8 Cycle design tools will be developed in the near future. Currently, 8 different Cycle design tools, one Dimensioning tool and one System analysis tool are implemented in EES-CoolTools. The four subgroups of tools shown in Figure 1 are designed to assist the engineer of a refrigeration system right from the phase of choosing the overall process design to evaluating the commissioned refrigeration system. The different subgroups will be described in the subsequent C-Tools D-Tools S-Tools E-Tools Cycle Design Dimensioning of System Simulation of Operation Evaluation of Operation paragraphs. The fifth category contains Accessory tools. EES-CoolTools have been divided into five subgroups: Tools for Cycle design, for Dimensioning of components, for System analysis and for Evaluation of system performance (based on measurements). The same simulation model (tool) can serve more purposes as each tool allows flexibility in choosing specific input-variables to describe a certain phenomenon. This is made possible by defining a number of specific simulation purposes. The tools are designed to give the user exactly the right quantity of information with a minimum of input information required. EES-CoolTools Overview EES-CoolTools are developed for end-users and not for modellers who wants a lot of freedom to manipulate the equation system constituting the mathematical model.
Dynamics EES-CoolTools and Refrigeration Utilities form the major part of the programs while Dynamics still is in its early stage of development. The programs can be divided into 3 main groups: 1. CoolPack consists of a number of programs which all can be accessed through a user-friendly interface. By using the programs in CoolPack the engineer has the possibility to evaluate different solutions and is thereby getting an opportunity for improving the energy-economics. Today, most engineers do not spend much time on energy optimisation when designing a new refrigeration system due to lack of efficient methods and computational tools. Introduction The overall purpose of developing CoolPack is to assist engineers and users of refrigeration systems in the process of designing and utilising refrigeration systems more energy efficiently. The purpose of this article is twofold: Introduction to the use of CoolPack and presentation of some of the related technical issues of modelling and layout of user interface. CoolPack is freeware and can be downloaded from Users without access to the Internet can contact Team CoolPack by using the address stated in the last paragraph. The Danish Energy Agency finances the project. CoolPack is developed at the Department of Energy Engineering at the Technical University of Denmark. 1 CoolPack Simulation tools for refrigeration systems Team CoolPack, Department of Energy Engineering, Technical University of Denmark CoolPack is a collection of programs used for energy analysis and optimisation of refrigeration systems.