{"action":"created","issue":{"url":"https://api.github.com/repos/NREL/EnergyPlus/issues/5026","labels_url":"https://api.github.com/repos/NREL/EnergyPlus/issues/5026/labels{/name}","comments_url":"https://api.github.com/repos/NREL/EnergyPlus/issues/5026/comments","events_url":"https://api.github.com/repos/NREL/EnergyPlus/issues/5026/events","html_url":"https://github.com/NREL/EnergyPlus/pull/5026","id":95111848,"number":5026,"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},"labels":[{"url":"https://api.github.com/repos/NREL/EnergyPlus/labels/NewFeature","name":"NewFeature","color":"db5700"}],"state":"open","locked":false,"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 8.4.0","creator":{"login":"Myoldmopar","id":849824,"avatar_url":"https://avatars.githubusercontent.com/u/849824?v=3","gravatar_id":"","url":"https://api.github.com/users/Myoldmopar","html_url":"https://github.com/Myoldmopar","followers_url":"https://api.github.com/users/Myoldmopar/followers","following_url":"https://api.github.com/users/Myoldmopar/following{/other_user}","gists_url":"https://api.github.com/users/Myoldmopar/gists{/gist_id}","starred_url":"https://api.github.com/users/Myoldmopar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Myoldmopar/subscriptions","organizations_url":"https://api.github.com/users/Myoldmopar/orgs","repos_url":"https://api.github.com/users/Myoldmopar/repos","events_url":"https://api.github.com/users/Myoldmopar/events{/privacy}","received_events_url":"https://api.github.com/users/Myoldmopar/received_events","type":"User","site_admin":false},"open_issues":133,"closed_issues":39,"state":"open","created_at":"2015-07-28T14:11:03Z","updated_at":"2015-08-28T16:11:25Z","due_on":"2015-09-30T06:00:00Z","closed_at":null},"comments":20,"created_at":"2015-07-15T05:40:42Z","updated_at":"2015-08-28T18:24:44Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/NREL/EnergyPlus/pulls/5026","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"},"body":"##### Introduction of the New VRF-HP Model #####\r\nThe 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 fewer 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.\r\n\r\n\r\n##### Code Hierarchy for the New VRF-HP Model #####\r\n![vrf-hp coding hierarhcy_zrp](https://cloud.githubusercontent.com/assets/7785946/9286859/dbf7ef74-42b2-11e5-8c3c-9965ca86fcfb.PNG)"},"comment":{"url":"https://api.github.com/repos/NREL/EnergyPlus/issues/comments/135853574","html_url":"https://github.com/NREL/EnergyPlus/pull/5026#issuecomment-135853574","issue_url":"https://api.github.com/repos/NREL/EnergyPlus/issues/5026","id":135853574,"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},"created_at":"2015-08-28T18:24:44Z","updated_at":"2015-08-28T18:24:44Z","body":"Hi @mjwitte, just got confirmed: 3 m3/s lies in the normal OU fan airflow range (6000-7000 cfm)"}}