{"action":"created","comment":{"url":"https://api.github.com/repos/NREL/EnergyPlus/pulls/comments/37076418","id":37076418,"diff_hunk":"@@ -52927,6 +53038,337 @@ AirConditioner:VariableRefrigerantFlow,\n        \\note Enter the time constant used to model the transition\n        \\note from cooling only mode to heat recovery mode\n \n+AirConditioner:VariableRefrigerantFlow:FluidTemperatureControl,\n+       \\memo This object models the performance of the Variable Refrigerant Flow system \n+       \\memo excluding the indoor units. \n+       \\min-fields 21\n+  A1 , \\field Heat Pump Name\n+       \\required-field\n+       \\type alpha\n+       \\note Enter a unique name for this variable refrigerant flow heat pump\n+  A2 , \\field Availability Schedule Name\n+       \\type object-list\n+       \\object-list ScheduleNames\n+       \\note Enter the name of a schedule that defines the availability of the unit.\n+       \\note Schedule values of 0 denote the unit is off. All other values denote the unit is available.\n+       \\note If this field is left blank, the unit is available the entire simulation.\n+  A3 , \\field Zone Terminal Unit List Name\n+       \\required-field\n+       \\type object-list\n+       \\object-list ZoneTerminalUnitListNames\n+       \\note Enter the name of a ZoneTerminalUnitList. This list connects zone terminal units to this\n+       \\note heat pump.\t   \n+  A4 , \\field Refrigerant Type\n+       \\required-field\n+       \\type object-list\n+       \\object-list FluidNames\n+       \\default R410A\n+  N1 , \\field Reference Cooling COP\n+       \\type real\n+       \\units W/W\n+       \\minimum> 0.0\n+       \\default 3.3\n+       \\note Enter the coefficient of performance at rated conditions or leave blank to use default.\n+       \\note This reference COP value is only used for the initialization of the physics based VRF model.\n+  N2 , \\field Reference Heating COP\n+       \\type real\n+       \\units W/W\n+       \\minimum> 0.0\n+       \\default 3.4\n+       \\note Enter the coefficient of performance at rated conditions or leave blank to use default.\n+       \\note This reference COP value is only used for the initialization of the physics based VRF model.\n+  N3 , \\field Reference Outdoor Unit Superheating \n+       \\required-field\n+       \\type real\n+       \\units deltaC  \n+  N4 , \\field Reference Outdoor Unit Subcooling \n+       \\required-field\n+       \\type real \n+       \\units deltaC   \n+  A5 , \\field Refrigerant Temperature Control Algorithm for Indoor Unit\n+       \\required-field\n+       \\type choice\n+       \\key ConstantTemp\n+       \\key VariableTemp\n+       \\default VariableTemp","path":"idd/Energy+.idd.in","position":203,"original_position":203,"commit_id":"085e9b18e86f8db4d5b60cff22c6141594db4c8f","original_commit_id":"085e9b18e86f8db4d5b60cff22c6141594db4c8f","user":{"login":"rraustad","id":5778156,"avatar_url":"https://avatars.githubusercontent.com/u/5778156?v=3","gravatar_id":"","url":"https://api.github.com/users/rraustad","html_url":"https://github.com/rraustad","followers_url":"https://api.github.com/users/rraustad/followers","following_url":"https://api.github.com/users/rraustad/following{/other_user}","gists_url":"https://api.github.com/users/rraustad/gists{/gist_id}","starred_url":"https://api.github.com/users/rraustad/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rraustad/subscriptions","organizations_url":"https://api.github.com/users/rraustad/orgs","repos_url":"https://api.github.com/users/rraustad/repos","events_url":"https://api.github.com/users/rraustad/events{/privacy}","received_events_url":"https://api.github.com/users/rraustad/received_events","type":"User","site_admin":false},"body":"Remove the \\required-field tag.","created_at":"2015-08-14T13:37:24Z","updated_at":"2015-08-14T13:37:24Z","html_url":"https://github.com/NREL/EnergyPlus/pull/5026#discussion_r37076418","pull_request_url":"https://api.github.com/repos/NREL/EnergyPlus/pulls/5026","_links":{"self":{"href":"https://api.github.com/repos/NREL/EnergyPlus/pulls/comments/37076418"},"html":{"href":"https://github.com/NREL/EnergyPlus/pull/5026#discussion_r37076418"},"pull_request":{"href":"https://api.github.com/repos/NREL/EnergyPlus/pulls/5026"}}},"pull_request":{"url":"https://api.github.com/repos/NREL/EnergyPlus/pulls/5026","id":39989693,"html_url":"https://github.com/NREL/EnergyPlus/pull/5026","diff_url":"https://github.com/NREL/EnergyPlus/pull/5026.diff","patch_url":"https://github.com/NREL/EnergyPlus/pull/5026.patch","issue_url":"https://api.github.com/repos/NREL/EnergyPlus/issues/5026","number":5026,"state":"open","locked":false,"title":"91977808 New VRF model","user":{"login":"rongpengzhang","id":7785946,"avatar_url":"https://avatars.githubusercontent.com/u/7785946?v=3","gravatar_id":"","url":"https://api.github.com/users/rongpengzhang","html_url":"https://github.com/rongpengzhang","followers_url":"https://api.github.com/users/rongpengzhang/followers","following_url":"https://api.github.com/users/rongpengzhang/following{/other_user}","gists_url":"https://api.github.com/users/rongpengzhang/gists{/gist_id}","starred_url":"https://api.github.com/users/rongpengzhang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rongpengzhang/subscriptions","organizations_url":"https://api.github.com/users/rongpengzhang/orgs","repos_url":"https://api.github.com/users/rongpengzhang/repos","events_url":"https://api.github.com/users/rongpengzhang/events{/privacy}","received_events_url":"https://api.github.com/users/rongpengzhang/received_events","type":"User","site_admin":false},"body":"The proposed new feature introduces a new model to simulate the energy performance of Variable Refrigerant Flow (VRF) systems in the heat pump (HP) operation mode (either cooling or heating is provided but not simultaneously). \r\n\r\nCompared with the existing VRF-HP model in EnergyPlus, the proposed model is more physics-based and thus able to consider the dynamics of more operational parameters, which is essential for the description of many enhanced control logics (e.g., the adjustment of superheating degrees during small load operations). Furthermore, the proposed model implements component-level curves rather than the system-level curves, and thus requires much curves as model inputs. The definition of VRF performance data for simulation as part of ASHRAE Standard 205 will ensure VRF manufacturers provide adequate data to create the required performance curves.\r\n\r\nThe new VRF model will be an alternative for the users. We propose to add the new VRF heat pump model in EnergyPlus for the Fall 2015 release, while keeping the existing VRF model intact. An on-going effort covers the development and validation of a new VRF heat recovery (HR) model, which will be implemented in future release (2016) of EnergyPlus.","created_at":"2015-07-15T05:40:42Z","updated_at":"2015-08-14T13:37:24Z","closed_at":null,"merged_at":null,"merge_commit_sha":"ee6d3beca8115e4d2dfa625308ad1295cbe91e00","assignee":null,"milestone":{"url":"https://api.github.com/repos/NREL/EnergyPlus/milestones/1","html_url":"https://github.com/NREL/EnergyPlus/milestones/EnergyPlus%208.4.0","labels_url":"https://api.github.com/repos/NREL/EnergyPlus/milestones/1/labels","id":1229491,"number":1,"title":"EnergyPlus 8.4.0","description":"Public release of EnergyPlus 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