# Energy Cycles > Energy efficiency study tool for power generation and HVAC cycles. (iPhone/iPad app by Muralidhar Shenoy.) - Source: https://appshunter.io/ios/app/energy-cycles/id580253420 (this page in markdown: same URL + `.md`) - Developer: [Muralidhar Shenoy](https://appshunter.io/developer/460148822) - Category: Utilities, Reference - Price: $6.99 - Age rating: 4+ - Requires: iOS 14.3 · 2 MB - Languages: English - Released: 2012-11-29 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/energy-cycles/id580253420/reviews.md ## What is Energy Cycles? Energy Cycle App covers four major energy conversion cycles to facilitate as a tool for performing energy efficiency studies. The graphical presentation of different models shown in a generic form composed of components that are steady state energy devices where in its state properties remain constant at the inlet and outlet regardless of time for analysis purpose. This can be very helpful to different energy engineers and auditors in assessing the cycle performances with respect to sizing and conversion efficiencies. There are four separate built-in apps in one. Two under utility power generation category and two under HVAC category as shown in the following screen shots. Each can be tailored to suit individual application and can be saved in a file for continuous reference and to monitor the changes and improvement. Energy Cycles: I Rankine Cycle a. Boiler (conventional fossil fuel) b. Turbine (single, two and three stage) c. Condenser d. Feed Pump II Combined Heat and Power (CHP Brayton) Cycle a. Air compressor b. Fuel Injection c. Gas Turbine d. Steam Generator III HVAC Cooling Cycle a. Conditioned space b. Outdoor Air c. Fan-coil process d. Return and Exhaust air flows IV HVAC Heating Cycle a. Conditioned space b. Outdoor Air c. Fan-coil process d. Return and Exhaust air flows Each cycle component responds to individual touch for editing. Upon editing, state properties are computed and presented in a table form and displayed in the scroll view of the respective home screen. The following screen shot on Rankine cycle has a 3 stage turbine and hence got 8 states. Inter-stages of the turbine with temperature and pressure data are also shown in the screen shot that is in response to the tapping of turbine icon in the model. Accordingly, the thermodynamic state properties of steam are calculated and presented in the property table of the Rankine cycle. For HVAC, a separate section has been added as a part of conditioned space for editing cooling and heating load under 10 major categories as shown in the screen shot. A separate computation button is provided for the users to select and compute load under each category by editing default parameters as per recommended practice. A comprehensive foot note is also provided under each category for proper editing and load computation. Cycle performance and efficiency results are indicated in red just to distinguish it from the data and updated as and when component editing is done. In addition, for Rankine and CHP a comprehensive cycle heat balance is also provided. All Cycle data can be saved with unique title and can be reloaded as and when required for editing and review. Only few screen shots covers mainly Rankine, CHP and HVAC cooling cycle. For additional screen shots and examples on above energy cycles please refer to our web site at www.flowjoule.com Users can choose either SI or USCS to enter all input data. App notes are provided for each model for clarity on type of input and output with computation logic. One can easily access it from home screen. This application will be constantly updated and all future updates are available at no extra cost. ## Key features - Four major energy conversion cycles - Graphical presentation of energy devices - Component editing for state property computation - Save and reload cycle data - SI or USCS unit selection - Cycle performance and efficiency results ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/energy-cycles/id580253420/reviews.md ### 1/5 — Waste of time *2013-02-26* These guys charge 10 dollars for just showing photos about the cycle, this app does not work! I am so dissatisfied with it. ## Frequently asked questions about Energy Cycles ### What are the four energy cycles covered by Energy Cycles? Energy Cycles covers the Rankine Cycle, Combined Heat and Power (CHP Brayton) Cycle, HVAC Cooling Cycle, and HVAC Heating Cycle. Each cycle is composed of various components that can be edited for analysis. ### Can I save my work in Energy Cycles? Yes, all cycle data in Energy Cycles can be saved with a unique title. This allows you to reload and review your configurations and monitor changes or improvements over time. ### Does Energy Cycles support different unit systems? Yes, users can choose between SI (International System of Units) or USCS (United States Customary System) to enter all input data within Energy Cycles. This flexibility accommodates different regional standards. ### How does Energy Cycles display results? Cycle performance and efficiency results are clearly indicated in red to distinguish them from input data. These results are updated dynamically as component editing is performed. ### Is Energy Cycles available on multiple devices? Energy Cycles is currently supported on iPhone and iPod devices. The app is designed for mobile use on these platforms. ### How often is Energy Cycles updated? The latest version of Energy Cycles is 2.1, and it was last updated on April 28, 2024. This indicates a relatively recent update for the application. ### What is the age rating for Energy Cycles? Energy Cycles has an age rating of 4+. This suggests that the content is generally suitable for young children and does not contain mature themes. ### Does Energy Cycles have ads? No, Energy Cycles does not contain advertisements. As a paid application, it provides an ad-free experience for users. ## Version history (last 5 releases) ### 2.1 — 2024-04-28 Updated for iOS17 (iPhone 15..) devices. ### 2.0 — 2023-05-14 Mandatory update for iOS 16. ### 1.9 — 2021-03-03 Updated App notes providing link for the additional documentation of individual app math-models along with guidelines to perform periodic maintenance activities based on individual performance indices. ### 1.8 — 2020-10-29 Updated for iOS 14 devices. ### 1.7 — 2020-08-08 Updated with iOS 13.0 and macOS Catalina. ## More apps by Muralidhar Shenoy - [Thermo Physical Prop](https://appshunter.io/ios/app/thermo-physical-prop/id460148819) - [Fluid Pressure Drop](https://appshunter.io/ios/app/fluid-pressure-drop/id467174085) - [AstroPro](https://appshunter.io/ios/app/astropro/id476327822) - [Orifice Flow](https://appshunter.io/ios/app/orifice-flow/id479581349) - [Centrifugal Pump Spec](https://appshunter.io/ios/app/centrifugal-pump-spec/id482488028) - [Boiler Efficiency](https://appshunter.io/ios/app/boiler-efficiency/id490506363) All apps by Muralidhar Shenoy: https://appshunter.io/developer/460148822 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*