{"action":"created","comment":{"url":"https://api.github.com/repos/NREL/EnergyPlus/pulls/comments/42753934","id":42753934,"diff_hunk":"@@ -644,6 +644,115 @@ Several things should be noted about the fraction of heat that is radiated direc\n \n Many of the control and integration aspects of the high temperature radiant system model in EnergyPlus are very similar to the low temperature radiant system model.  The controls are the same as shown in “Figure 271.  Variable Flow Low Temperature Radiant System Controls” where the amount of heat generated by the radiant heater varies as a function of the difference between the controlling and the setpoint temperatures.  As with the low temperature radiant system, the controlling temperature is allowed to be the mean air, the mean radiant, or the operative temperature, and the setpoint temperature is allowed to vary hourly based on a user defined schedule.  (Operative temperature for radiant system controls is the average of MAT and MRT.)  Also, since the high temperature radiant heater has a direct impact on the surfaces within a zone, the surface heat balances are recalculated to determine an approximate response to the radiation from the heater.  A final “average” heat balance calculation is done after all of the system time steps have been simulated to maintain continuity within the surface heat balances.  The algorithm shown in “Figure 274.  Resolution of Radiant System Response at Varying Time Steps is also used for high temperature radiant heaters.\n \n+### Simple Cooling Panel\n+\n+#### Overview\n+\n+The simple chilled ceiling model is similar to the high temperature radiant system and the hot water radiant/convective baseboard models and was developed to make the modeling of certain radiant systems easier.  The existing chilled beam model in EnergyPlus, while useful for modeling active chilled beam systems, is a convective heat transfer only model that is not suitable for all radiant panels or passive chilled beam systems.\n+\n+#### Modeling Considerations/Assumptions\n+\n+The model is intended to be simple so several assumptions have been made regarding the performance of this system type:\n+\n+* Water is flowing through a pipe and that the water has a known inlet temperature defined by the plant loop.  The outlet water temperature is unknown and must be calculated as part of the simulation process.\n+\n+* No information regarding the shape or material of the chilled ceiling panel is required as this is intended to be a simple model only.\n+\n+* The air conditions of the space are known quantities and though the presence of this system will potentially impact this temperature, it will be assumed that the air temperature is “constant” for the time step in question.\n+\n+* The entity being modeled is essentially a heat exchanger with flowing water on one side and air on the other.\n+\n+* Since the water is changing temperature but the air is “not”, we effectively have a similar sort of heat exchanger formulation as the low temperature radiant heating system, but here the water temperature varies while the air temperature is “constant”.  Thus, an effectiveness-NTU heat exchanger formulation is best and allows the calculation of total heat gain to the panel and outlet water temperature.\n+\n+* The total net heat loss to the zone is determined using a user defined coefficient to calculate a zone temperature.  This “fraction” radiant parameter defines what portion of the zone temperature is based on the zone MRT with the remainder determined by the zone MAT.  While this user defined coefficient remains constant throughout the simulation in keeping with the simple nature of this model, it is not the same as defining a fixed radiant/convective split since this will vary with changing MRT and MAT.  More information on this is given below.\n+\n+* The load met by the system is included in the zone air heat balance as any other system’s impact is.  The impact of the system includes the convective load, the radiant gain that is distributed to people (assumed that it is converted into a convective loss), and the increased convection loss from the zone surfaces.\n+\n+* The radiant loss/gain is distributed to the surfaces as per the radiant surface list that lists which surfaces the radiant cooling panel will interact with and what fraction of radiation each surface will “see”.  This is similar to the existing radiant-convective baseboard model and these fractions are user inputs.\n+\n+* The model is an HVAC level model but interacts with the zone heat balances much like the radiant system and radiant/convective baseboard models.\n+\n+* Controls are based on controlling water flow rate (like the hydronic radiant system) to meet the thermostatic setpoint temperature of the unit with control types potentially including MAT, MRT, OpTemp, and/or ODB/OWB much like the low temperature radiant systems.  Controls based on standard air system thermostatic controls are also possible.\n+\n+* In the event that condensation is predicted on the surface of a panel, the model uses the same condensation control options as the low temperature radiant system.  These include: ignoring the problem and allowing the simulation to continue, shutting the system down when condensation is predicted, and a variable response that tries to keep the system running at a lower output while avoiding condensation conditions.\n+\n+* In order to avoid any violations of the Second Law of Thermodynamics or heating by the system, the cooling panel will be shut off if the inlet water temperature is above the zone temperature.\n+\n+#### Algorithm Details: Unit Performance and Calculation of the UA Value\n+\n+As stated above in the assumptions, the most prudent simple method for calculating the performance of a radiant cooling panel is to use a heat exchanger style formulation.  Since the air within the space (and the other surfaces of the space) will presumably be at a “constant” temperature while the water flowing through the panel will change temperature, we have a situation where one fluid is changing temperature and one remains at the same temperature.  This is very similar to the low temperature radiant system models which use the effectiveness-NTU method for calculating heat exchange between the water in the loop and the slab in which the pipes are embedded.  A summary of how this will be modeled for the radiant cooling panel follows in the next paragraphs.\n+\n+Several heat balances can be constructed that relate to the situation at hand.  First, a heat balance on the water loop results in:\n+\n+q=(m ̇c_p )_water (T_wi-T_wo )\t(1)\n+\n+where q is the energy transferred between the water loop and the surrounding space to which the cooling panel is exposed, m ̇ is the mass flow rate of the water, cp is the specific heat of the water, Twi is the inlet water temperature and Two is the outlet water temperature.\n+\n+The maximum amount of heat transfer that is possible according to the Second Law of Thermodynamics is:\n+\n+q_max=(m ̇c_p )_water (T_wi-T_z )\t(2)\n+\n+where qmax is the maximum possible energy transfer and Tz is the temperature of the surroundings (assumes that the air and the unconditioned surfaces in the space are at the same temperature for the sake of this development and the calculation of a UA; more explanation of Tz is given in the next section).\r\r\rThe ratio of the actual energy exchange to the maximum possible is known as the effectiveness of the heat exchanger, ε.  Thus, ε = q/qmax.\n+\n+For the case when one fluid is stationary in a heat exchanger, Incropera and DeWitt (1985) state that the effectiveness of a heat exchanger can be related to the number of transfer units (NTU) through the following relation:\n+\n+ε =1-e^(-NTU)\t(3)\n+\n+and NTU is defined by:\n+\n+NTU=UA/(m ̇c_p )_water  \t(4)\n+\n+The above equations will be used to model the performance of the panel within EnergyPlus and also to obtain a “design” UA value for the panel.\n+\n+Calculating the UA value of a cooling panel or coming up with a relationship for such a term is not a simple mater.  However, most devices are either rated or tested by the manufacturer under certain conditions.  From this rating information, a UA value can be calculated.  The EnergyPlus model will request rating information (inlet water temperature, mass flow rate, “air” temperature, and panel output under rating conditions) and then use it to calculate a UA value that will be used to model the performance of the panel.\n+\n+The development of the method for estimating the panel UA value will use the same equations shown above but simply with the purpose of calculating UA rather than the performance of the device, i.e. determining the output of the panel.  The method for estimating the UA value of the panel begins with the panel rating data that includes the following values:\n+\n+* Rating Inlet Water Temperature (Trwi)\n+\n+* Rating Air/Surroundings Temperature (Trz)\n+\n+* Rating Water Mass Flow Rate (m ̇_r)\n+\n+* Rated Output Capacity (Qr)\n+\n+To find UA, we first rearrange Equation 3 above to make NTU a function of effectiveness as follows:\n+\n+ε =1-e^(-NTU)\t(3)\n+\n+NTU=-ln⁡(1-ε) \t(5)\n+\n+where ε = Qr/qmax and qmax is calculated using design conditions.  This leads to:\n+\n+NTU=-ln⁡(1-Q_r/(((m_r ) ̇c_p )_water (T_rwi-T_rz ) )) \t(6)\n+\n+Finally, substituting the definition of NTU as shown in Equation 4, we obtain an equation for UA that is calculated directly from the rated values that the user supplies:\n+\n+UA=-((m_r ) ̇c_p )_water ln⁡(1-Q_r/(((m_r ) ̇c_p )_water (T_rwi-T_rz ) )) \t(7)\n+\n+This UA value will be used by the simple model to calculate the output of the radiant cooling panel based on the current water inlet temperature and mass flow rate as well as the space temperature (combination of air and radiant temperature) as described below.\rAlgorithm Details: Zone Temperature for Radiant Panel Output and “Fraction Radiant” Input\rThe output from the panel will be based on the mean air temperature (MAT) and the mean radiant temperature (MRT) from the space.  These two temperatures will be combined to create a “zone” temperature that will be used in the model to calculate the radiant cooling panel output.  As shown in the previous section, a UA value will be calculated using rated conditions.  This UA value will be assumed to be constant and used in conjunction with the effectiveness-NTU method described in the previous section to determine the output of the panel based on water inlet temperature, water mass flow rate, and space conditions.  The space conditions will take into account both the mean air temperature and the mean radiant temperature via the following equation:\n+\n+T_z=x_r MRT+(1-x_r )MAT \t(8)\n+\n+where xr is the “Fraction Radiant” for the radiant cooling panel that the user provides.","path":"doc/src/docs/EngineeringReference/13e-EncyclopaedicRefs.md","position":94,"original_position":94,"commit_id":"5b8dda89d66c2fa42f6271540f46c05712072e0d","original_commit_id":"5b8dda89d66c2fa42f6271540f46c05712072e0d","user":{"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},"body":"Probably need some blank lines between these paragraphs to get it to render properly.","created_at":"2015-10-22T14:24:13Z","updated_at":"2015-10-22T14:24:13Z","html_url":"https://github.com/NREL/EnergyPlus/pull/5027#discussion_r42753934","pull_request_url":"https://api.github.com/repos/NREL/EnergyPlus/pulls/5027","_links":{"self":{"href":"https://api.github.com/repos/NREL/EnergyPlus/pulls/comments/42753934"},"html":{"href":"https://github.com/NREL/EnergyPlus/pull/5027#discussion_r42753934"},"pull_request":{"href":"https://api.github.com/repos/NREL/EnergyPlus/pulls/5027"}}},"pull_request":{"url":"https://api.github.com/repos/NREL/EnergyPlus/pulls/5027","id":40042508,"html_url":"https://github.com/NREL/EnergyPlus/pull/5027","diff_url":"https://github.com/NREL/EnergyPlus/pull/5027.diff","patch_url":"https://github.com/NREL/EnergyPlus/pull/5027.patch","issue_url":"https://api.github.com/repos/NREL/EnergyPlus/issues/5027","number":5027,"state":"open","locked":false,"title":"972154 new simple chilled ceiling","user":{"login":"RKStrand","id":5804989,"avatar_url":"https://avatars.githubusercontent.com/u/5804989?v=3","gravatar_id":"","url":"https://api.github.com/users/RKStrand","html_url":"https://github.com/RKStrand","followers_url":"https://api.github.com/users/RKStrand/followers","following_url":"https://api.github.com/users/RKStrand/following{/other_user}","gists_url":"https://api.github.com/users/RKStrand/gists{/gist_id}","starred_url":"https://api.github.com/users/RKStrand/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/RKStrand/subscriptions","organizations_url":"https://api.github.com/users/RKStrand/orgs","repos_url":"https://api.github.com/users/RKStrand/repos","events_url":"https://api.github.com/users/RKStrand/events{/privacy}","received_events_url":"https://api.github.com/users/RKStrand/received_events","type":"User","site_admin":false},"body":"@Myoldmopar @mjwitte @lgentile The simple chilled ceiling model that was completed last fall has now been reimplemented into the current develop and I believe that all issues should now be resolved.  There are some HVAC iteration maximums, but as this is a radiant system that is fairly lightweight, I think this is okay.  It isn't happening all of the time so this should be fine.","created_at":"2015-07-15T16:33:07Z","updated_at":"2015-10-22T14:24:13Z","closed_at":null,"merged_at":null,"merge_commit_sha":"0cb91d69d986aa62dbe87d4fbde07b09b2089d2c","assignee":{"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},"milestone":{"url":"https://api.github.com/repos/NREL/EnergyPlus/milestones/2","html_url":"https://github.com/NREL/EnergyPlus/milestones/EnergyPlus%208.5.0","labels_url":"https://api.github.com/repos/NREL/EnergyPlus/milestones/2/labels","id":1240491,"number":2,"title":"EnergyPlus 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