Entry Type ID Date Applicable Rating System Primary Credit Inquiry (LIs) Ruling (LIs) Related Addenda/LIs Related Resources Campus Applicable Internationally Applicable Country Applicability Reference Guide (Addenda) Page (Addenda) Location (Addenda) Description of Change (Addenda) "LEED Interpretation" "5424" "2001-06-20" "New Construction" "EQc7.2 - Thermal comfort - permanent monitoring system " "We propose to install (2) humidity monitors on each floor at the point where the plenum return air enters each mechanical room. Each monitor will interface with the building EMS system to provide continuous feedback on overall humidity levels. Psychometric analysis will be provided to show that in the City of Phoenix, humidification / dehumidification equipment is not needed to maintain acceptable humidity levels within the office space. Will the system and documentation described above comply with the requirements of this credit? If not, what additional information or system modification is needed?" "Should the psychometric data in fact show that active humidification / dehumidification is not needed to maintain acceptable levels, the approach as described will comply with the requirements of the credit. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "5575" "2002-01-18" "New Construction" "EQc7.1 - Thermal comfort - compliance with ASHRAE 55-1992 " "For the residential building context, temperature control is attained through thermostats located in each apartment. (In this project, all apartments with more than one bedroom have at least 2 thermostats.) Humidity control is provided automatically through a humidification system during the heating season (which maintains 30% RH) and through fan coil units used during the cooling season (sized to ensure that 50% RH is not exceeded). Humidity sensors will be placed in select apartments to measure the RH during the heating season. These sensors will be linked to the supply air HVAC units to provide automatic humidification control. RTA proposes that this level of control, in a multifamily residential setting, meets the intent of this credit." "The LEED Steering Committee provided an interpretation of this Inquiry. The Committee determined that the strategy described meets the intent of EQ credit 7.1, but NOT the intent of EQ credit 7.2 as proposed. The Committee decided that EQ credit 7.2 was probably NOT ADDRESSIBLE in residential occupancies, unless each residential unit can fully monitor and control individual humidity. The Committee perceives potential problems associated with controlling building-wide humidity based on conditions in a subset of residential units. The strategy proposed does NOT address the intent of this credit." "None" "None" "LEED Interpretation" "5927" "2002-08-08" "New Construction" "EQc7.2 - Thermal comfort - permanent monitoring system " "Thermal Comfort: Permanent Monitoring System Background: Our understanding of this point since the outset of the project design process (initiated under the March 2000 version of the LEED Rating System) is that this point requires only monitoring of temperature and humidity configured to provided operators control over thermal comfort performance and effectiveness of humidification and/or dehumidification systems in the building, and does not require a humidification system. We concluded this after establishing that the Thermal Comfort: ASHRAE 55-1992 point required humidification/dehumidification systems to maintain the prescribed performance bandwidths. Further evidence that this temperature and humidity monitoring point did not require both humidification and dehumidification systems was that the monitoring system was to provide operators control over thermal comfort performance and effectiveness of humidification AND/OR dehumidification systems. This conclusion was further supported by documentation requirements (stated in the August 2000 Unformatted Draft Reference Guide) which calls for evidence of the monitoring system components only and a description of building operators interface, but not evidence of a humidification/or dehumidification system. We understand the value of monitoring both temperature and humidity even when (in our case) a humidification system is not provided. In winter, when building RH is prone to go below the ASHRAE 55 minimum, the building operators will know when these conditions exist, as they will be notified by the building automation system by the feedback loop, and can take steps to control RH to a certain extent by modulating temperature, air velocity, and outside air volumes. Humidity monitoring will provide critical feedback for humidity control and performance by the dehumidification system (AC) throughout the entire year as this large project is driven by internal loads requiring dehumidification year round. In the June 2000 issue of the rating system the words ""and control system"" was added to the documentation requirements for the monitoring point. This prompted a review of the credit interpretations on this issue. One of the credit interpretations for this monitoring point implies that humidification and dehumidification systems, as well as monitoring and control, are required by the monitoring system point. Credit Interpretation Request: Only a temperature and humidity MONITORING system with a feedback loop to the building operator so that they may make adjustments to humidification AND/OR dehumidification system is required by this point, correct?" "The intent of this point is to encourage monitoring and control of building temperature and humidity levels. The credit specifically requires monitoring AND control, but the project has some leeway in determining how the control would be accomplished. In general, the project needs to demonstrate that humidity is controlled, or demonstrate through modeling/analysis that humidity control will not be necessary to maintain comfort. It is unclear from the question whether humidity control is proposed or not. To achieve the credit, some level of humidity control is required. To achieve the point, the project could demonstrate that the building sequence of operations addresses humidity control, whether automatically or manually. However, the point would not be achieved simply because the mechanical system has an effect on humidity. (For example, the presence of an air conditioning system alone does not imply that humidity is controlled, merely that the system affects humidity.) As for the need to install humidification and dehumidification equipment, this would be dependent on climatic conditions, as related to attempts to meet the requirements of ASHRAE 55 in EQ credit 7.1 Applicable internationally." "None" "None" "X" "LEED Interpretation" "6070" "2002-12-23" "New Construction" "EQc7.2 - Thermal comfort - permanent monitoring system " "We would like to confirm that the following approach for a multi-family building with completely individual HVAC systems and no common use areas other than circulation paths will be acceptable to meet the intent of LEED 2.0 Credit 7.2: Thermal Comfort: Permanent Monitoring System: To address the monitoring portion of this Credit, we plan to install a ""peramanent temperature and humidity monoring system"" in each apartment in the form of hard-wired thermostat/humidistat combination units. These Temp/RH monitors will provide each tenant (who is the ""operator"" in multi-family residential buildings) control over the thermal comfort environment of the apartment. We will also provide humidification control by making humidifiers available to each apartment (probably with a deposit built into the lease to mitigate theft). Dehumidification control for each apartment will be inherent in the air conditioning system. User education will be provided to tenants for these controls. We have reviewed the Credit Ruling to the related LEED Credit Inquiry dated 1/18/02, stating ""The Committee decided that EQ credit 7.2 was probably NOT ADDRESSIBLE in residential occupancies, unless each residential unit can fully monitor and control individual humidity. The Committee perceives potential problems associated with controlling building-wide humidity based on conditions in a subset of residential units"". We feel that the previous Ruling responded to a different building type, compared with ours wherein HVAC systems are completely individualized for each dwelling unit. In other words, humidity control by one tenant in one apartment does not significantly impact humidity control of the other apartments or of the building as a whole." "The Credit Ruling Committee of the USGBC has confirmed that this credit is not applicable to residential projects. Forthcoming revisions to ASHRAE Standard 55 also cite the fact that humidity control and monitoring in residential occupancies is not comparable to commercial occupancies, and that commercial occupant comfort ranges do not apply in residential situations." "None" "None"