EnergyPlus

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  1. Central Plant Water to Water Heatpump with EIR Formulation

    The existing models for central plant water to water heatpump, HeatPump:WaterToWater:* are not formulated to be able to use the types of performance curves that are typically used in the industry. It is not possible to properly represent equipment performance characteristics with the current equation fit models and the parameter estimation model is not robust enough in practice.

    Suggest to add new models for water-to-water heatpump that are formulated using an EIR-type approach for unloading curves such as are used elsewhere in the chiller and chiller-heater models. The existing two models might be deprecated.

    2 votes
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  2. Model a chiller with multiple compressors

    Model a chiller with multiple compressor

    8 votes
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    1 comment  ·  HVAC - Plant  ·  Admin →
  3. GSHP sizing

    GSHP sizing is currently not available.

    8 votes
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  4. Water-to-water heat exchanger should be allowed to be on plant demand side

    Water-to-water heat exchanger should be allowed to be on plant demand side. We tried to user this object to model water-cooled economizer with primary-secondary loop. Because the water-to-water heat exchanger currently can only be on the supply size, the inlet temperature is low and cannot capture the savings when the water-side economizer is on the demand side.

    7 votes
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  5. Add steam to hot water heat exchanger

    Steam heating is common in commercial and university campuses. Often, steam energy is transferred at the building to a hot water system via a heat exchanger.

    Currently OS users can make both steam and hot water systems, but cannot link them together. This forces modelers to use HW boilers/systems to approximate the steam systems, which isn't accurate and reduces confidence in the energy model.

    https://unmethours.com/question/2688/steam-to-hw-loop-error-in-openstudio/?comment=17839#post-id-17839

    4 votes
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  6. Air Source Central Plant Electric or Gas Engine-Driven Heat Pump

    Problem: EnergyPlus cannot model a heat pump in the central plant supplying (alternatively) cooling to a chilled water loop or heating to a hot water loop. This is an air to water heat pump.

    Rationale: Though not as common in the US, in other parts of the world air to water heat pumps for heating are used and EnergyPlus should be able to model them..

    Solution: Add a new component model to EnergyPlus plant for such equipment.

    Context: Current work around is to use a heat pump water heater, which is really inteded for domestic hot water, along with an…

    9 votes
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  7. Enhanced ground heat exchanger model that doesn’t require third-party tools

    Create a new ground heat exchanger model for use in EnergyPlus and design tools. The model should be capable of generating thermal response functions (g-functions), or direct simulation of ground heat exchanger systems. The model should properly simulate ground freezing, non-uniform undisturbed ground temperatures, and borefields with irregular shapes and sizes—all of which are commonly encountered in almost all GSHP applications and are currently lacking in current models. This model will enable building designers to be able to properly compare GSHP systems against other systems and eliminate the need to use third-party tools to generate the required thermal response functions.

    2 votes
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  8. Add seasonal thermal energy storage model

    Add new model to EnergyPlus to support seasonal thermal energy storage.

    https://en.wikipedia.org/wiki/Seasonal_thermal_energy_storage

    2 votes
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  9. Add Deadband Control Ranges to Plant Operation Schemes

    Problem: The plant simulation enforces ‘ideal control’ of the loop and typically operates the equipment to exactly meet setpoints. Part-load operation, as well as some optimal control strategies, often require deadbands in the control range. This allows for some overcooling or overheating of the loop to avoid low efficiency operating ranges. EnergyPlus cannot model these deadband controls well.

    Rationale: Non-ideal controls support optimal plant operation schemes. Energy savings from loosening up the controls can be significant for some systems.

    Solution: The proposed upgrade would implement user-controlled ‘fuzzy’ setpoints on the plant nodes. The loop manager responsible for meeting the setpoint…

    2 votes
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  10. Modeling District Cooling / Heating systems

    EnergyPlus can report a building’s thermal loads as district cooling and heating loads. District heating and cooling (DHC) system loads can be entered as plant loads to simulate central plant performance. However EnergyPlus does not count the pumping energy or heat loss in the piping of DHC systems. Additional controls of DHC coupled with CHP are also needed in EnergyPlus to track either cooling, heating, or electrical loads. Modeling DHC systems is a key component of modeling urban systems.

    18 votes
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  11. air cooled chiller with heat recovery

    At the moment the heat recovery option only works for water cooled chillers, while I would like to model an air coolled chiller where part of the removed heat is recovered through a water loop.

    5 votes
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  12. Implement constant-flow, variable-temperature plant loops

    Problem: there is no way, out of the box, to implement a constant-flow, variable-temperature plant loop in E+ without using EMS.

    Context: One example application is when a boiler is heating an indirect dhw tank.

    3 votes
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  13. Modeling Non-Vapor-Compression HVAC Technologies

    Non-Vapor-Compression HVAC technologies, such as thermoelectric and magnetocaloric technologies, are gaining attractions for their exceptional environmental performance. These emerging technologies can be alternatives to vapor-compression technology for residential and commercial HVAC applications in many cases. Implementing the corresponding models in EnergyPlus can facilitate the evaluation and application of these technologies.

    8 votes
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  14. absorption chiller with air-cooled condenser

    I would like to model an absorption chiller with air-cooled condenser. It seems that ChillerHeater:Absorption:DirectFired can provide both heating and cooling, while I am interested in modeling an absorption chiller and a hot water loop that is connected to a boiler and provides heat for the chiller.

    1 vote
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