ICT PLATFORM FOR HOLISTIC ENERGY EFFICIENCY SIMULATION AND LIFECYCLE MANAGEMENT OF PUBLIC USE FACILITIES
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1 SEVENTH FRAMEWORK PROGRAMME OF THE EUROPEAN COMMUNITY (EC GRANT AGREEMENT N 26088) ICT PLATFORM FOR HOLISTIC ENERGY EFFICIENCY SIMULATION AND LIFECYCLE MANAGEMENT OF PUBLIC USE FACILITIES Deliverable D6.2: Web service and interface client for interoperable energy management support Responsible Authors: Tuomas Laine, Francisco Forns Samso, Eino Kukkonen Co Authors: Marie Christine Geißler Due date: Issue date: Nature: Prototype
2 page 2/19 Start date of project: Duration: 36 months Organisation name of lead contractor for this deliverable: Insinööritoimisto Olof Granlund Oy History Version Description Lead Author Date 0.1 First Draft Granlund Oy Second Draft Granlund Oy Edited pre final version TUD CIB Final Version Granlund Oy Copyright This report is HESMOS Consortium Its duplication is restricted to the personal use within the consortium, the funding agency and the project reviewers. Its duplication is allowed in its integral form only for anyone's personal use for the purposes of research or education. Citation Laine T., Forns Samso F., Kukkonen E., Geißler M., (2012): HESMOS Deliverable D6.2: Web service and interface client for interoperable energy management support, HESMOS Consortium, Brussels. Acknowledgements The work presented in this document has been conducted in the context of the seventh framework programme of the European community project HESMOS (n 26088). HESMOS is a 36 month project that started in September 2010 and is funded by the European Commission as well as by the industrial partners. Their support is gratefully appreciated. The partners in the project are Technische Universität Dresden (Germany), NEMETSCHEK Slovensko, S.R.O. (Slovakia), Insinooritoimisto Olof Granlund OY (Finland), Royal BAM Group NV (The Netherlands), Obermeyer Planen + Beraten (Germany) and AEC3 LTD. This report owes to a collaborative effort of the above organizations. Project of SEVENTH FRAMEWORK PROGRAMME OF THE EUROPEAN COMMUNITY Dissemination Level PU Public X PP Restricted to other programme participants (including the Commission Services) RE Restricted to a group specified by the consortium (including the Commission Services) CO Confidential, only for members of the consortium (including the Commission Services)
3 page 3/19 Executive summary The objective of WP6 is to provide energy related tools and web services for the intelligent lifecycle management of public use facilities that are capable to resolve operating problems, improve comfort, optimize energy use, identify retrofits and provide related cost estimates. Deliverable D6.2 presents the development of the web service and data interface client for energy related management as planned in Task 6.2. Web services are utilized to integrate measured sensor data collected by building automation systems (BAS) with the tools of the Facilities Management module of the Integrated Virtual Energy Laboratory of HESMOS (IVEL). The performed work complies with the tasks specified in the HESMOS Description of Work. This deliverable report is a supplementary document that contains the data transfer specification to the developed software, which is the actual product of WP6. We present two use case scenarios that integrate sensor data with FM tools. The first use case supports requirements management of energy related thermal conditions. The second case supports monitoring of energy related system performance. The deliverable report is structured in four parts: The first part provides a description of the two use case scenarios of utilizing web services to transfer BAS data to requirements management of thermal conditions and monitoring of energy related system performance. The second part introduces the advantages of utilizing web services as the method to transfer data and describes the data transfer procedure into the energy requirements management and monitoring of energy performance management metrics. The third part presents the involment of a third party by testing the developed data interface before the FM GUI is ready, a separate practical example was used with existing BEQ visualization tool prototype developed in an earlier EU project BuildingEQ. The fourth part concludes with the tasks accomplished in this deliverable and the importance of integrating BAS data with FM tools for energy efficiency management. The following partners contributed task 6.2 work in accordance with their knowledge and expertise: OG: OG contributed its large experience in the development of integrated energy analysis and facilities management software. For the task 6.2, by new development and prototype implementation of the energy requirements management system and the energy performance management system metrics. BAM: BAM contributed its extensive experience in the operation of lifecycle optimized Public Private Partnership (PPP) projects.
4 page 4/19 Table of contents 1. USE CASE SCENARIOS FOR ENERGY RELATED FACILITIES MANAGEMENT USE CASE USE CASE DEVELOPED WEB SERVICES FOR ENERGY RELATED MANAGEMENT WEB SERVICE FOR ROOMEX WEB SERVICE FOR RYHTI METRICS PRACTICAL EXAMPLE: ITÄKESKUS SHOPPING CENTER CONCLUSIONS REFERENCES APPENDIX APPENDIX I: ACRONYMS AND ABBREVIATIONS...18 APPENDIX II: REQUIREMENTS FOR BAS WEB SERVICE INTERFACE...19
5 page 5/19 1. Use Case Scenarios for Energy Related Facilities Management In the scope of HESMOS task 6.2 web services are utilized to integrate sensor data collected by building automation systems (BAS) with the tools of the Facilities Management module on the HESMOS Integrated Virtual Energy Laboratory (IVEL). In order to cover applications for new and existing buildings that utilize BAS systems, two use case scenarios were developed that integrate sensor data with FM tools. The first use case supports requirements management of energy related thermal conditions. The typical users include tenants, end users and facility managers. The second case supports monitoring of energy related system performance. The typical users include building owners and facility managers. Figure 1 shows the two use cases described above for sensor data integration with the FM IVEL Web module. Figure 1: Description of data transfer of the two use case scenarios
6 page 6/ Use Case 1 Use case 1 supports requirements management of energy related thermal conditions. The information delivered will be related to spatial thermal conditions such as temperature and CO 2 content. The requirements management system ROOMEX already provides as required and asanalyzed thermal comparisons for the design phase as shown in Figure 2. In HESMOS, the new web based application of the ROOMEX software for requirements management is developed to support the whole building life cycle. As a web application it offers an easy access for the FM disciplines. Measured sensor data for specific times will be provided for as required against as measured comparisons regarding spatial thermal conditions in a building. The provided web service interfaces support best higher level, web based BAS systems that are typical in new buildings. Figure 2: Comparison of as required and as simulated thermal conditions during design phase 1.2 Use Case 2 Use case 2 supports monitoring of energy related system performance. It focuses on existing buildings that typically utilize different lower level building automation systems. Measured sensor data obtained from BAS will be transferred into energy related performance management RYHTI Metrics. BAS data will be transformed into performance metrics by comparing actual measurements with predetermined targets as shown in Figure 3 (Ihasalo, 2012). Predetermined performance targets
7 page 7/19 values represent good performance of the building and can be derived from building standards and guidelines or according to the equipment manufacturer s information. Figure 3: Methods of transforming automation data into performance metrics (Ihasalo, 2012) The purpose of energy performance metric is to obtain actual measured data to improve energy performance of the heating, ventilation and air conditioning system (HVAC). This aims to reduce energy consumption and improve indoor environmental conditions by continuously tracking and monitoring issues related to HVAC equipment. Contrary to the practice of tracking energy use measures, energy performance metrics concentrate on the factors that affect energy use in facilities. Usually, energy savers in buildings are gained by correction of operational and control deficiencies related to HVAC systems such as adjusting setpoints and changing time schedules or parameter settings (Mills, 2004). The measured factors are air handling units (AHU), time schedule efficiency and heat recovery efficiency. The energy performance metric is calculated as an average of these two sub measures. By measuring these factors users will have more comprehensive detailed information than common energy use displays. The reason for choosing a different approach for energy performance is to use the information available in building automation systems. Commonly, energy meters are not always connected to building automation systems. AHU time schedule efficiency The importance of AHU time schedule efficiency sub measure is to control that air handling units are operated only when needed. Many times air handling units are changed to meet special needs in the building and if the schedules are forgotten in this setting and never changed back to original settings then problems may occur. To prevent such situations the sub measure compares the actual AHU time schedule to a so called optimal time schedule. Optimal time schedule for each AHU is determined together with the users and operators of the building. The AHU time schedule efficiency sub measure has two target values, starting time and ending time. The sub measure is calculated by counting the time during which the actual time schedule exceeds the optimal time schedule and dividing this by the total measurement time.
8 page 8/19 Heat Recovery Efficiency Heat recovery efficiency has a significant impact on the energy use of buildings in cold climates. The purpose here is to track that the heat recovery efficiency unit achieves the thermal efficiency according to the equipment manufactures specification. Thermal inefficiencies are commonly due to manufacturing failures, poor installation and use during operation. Heat recovery efficiency will be calculated according to the efficiency ratio used in the calculations for supply air temperature which is defined in the European Standard EN 308 (CEN 1997) as: (2.1) where: t 21 = supply air inlet t 22 = supply air outlet t 11 = exhaust air inlet. The submeasure is calculated by dividing the actual heat recovery efficiency (2.1) by the target efficiency and multiplying by 100.
9 page 9/19 2. Developed Web Services for Energy Related Management In HESMOS, web services are utilized as the method to transfer measured sensor data collected from the BAS systems into energy related requirements management and energy related system performance management. This method enables more flexible integration of BAS data with energy related management systems. The purpose of using web services is that it allows working with services independent of the platforms and programming languages in which they are written (Bai et al., 2011). The key component of web services is the internet protocol XML providing a universal format for structured documents and data on the web. It represents content in a textual format that is platform and language neutral. XML can separate the user interfaces from structured data making possible to integrate the data which comes from different sources (Tom, 2004). However, many buildings use different levels of BAS systems. In many cases the information is not transferred in XML format but it can be delivered in other formats such as xls, csv or txt. For that reason an XML converter will be developed in HESMOS to translate the information into an XML file format. An example of that file format is shown in Figure 4. <?xml version="1.0" encoding="utf 8"?> <!DOCTYPE RMTransfer SYSTEM "RMTransfer.dtd"> <CONDITIONFILE HostID="localhost" OverwriteSenderHostID="no"> <LogPoint LogPointID="GW1.A03_G4_412TE16_K02_005_M"> <LogResult year="2009" month="8" day="1" hour="0" minute="0" second="0" type="temperature_c">22,70</logresult> <LogResult year="2009" month="8" day="1" hour="1" minute="0" second="0" type="temperature_c">22,80</logresult> </LogPoint> </CONDITIONFILE> Figure 4: XML File with temperature data The measured data is placed in the section named <CONDITIONFILE>. The basic idea is to send data values for selected data points (<LogPoint>) in a time tag section named <LogResult>. The time tag is defined with special fields for each time concept (year/month/day/hour/minute/second). The type attribute contains information about the type of data and the unit for the data. In addition to temperature measurements other XML sections contain information about room humidity, CO 2 levels and concrete core temperatures. 2.1 Web Service for ROOMEX In this use case scenario, a user will log in to the IVEL Connector providing a username and password. The IVEL connector is the portal application where web services can be chosen and connected to each other. The Intelligent Access Services (IAS) of the IVEL get the information from the IVEL connector and the user can access other applications such as the building automation systems. Sensor data can be accessed through the IAS by a specified filter, for instance, room temperature for a specific period of time can be selected via the interface. The basic connections are shown in Figure 5.
10 page 10/19 The user can request data of actual measured values and times from ROOMEX through web services, whereby both ROOMEX and RYHTI assume the use of BIM/IFC in the current version IFC2x3 as basis (cf. ISO/PAS 16739). For that purpose a list of IfcSpace names or GUIDs and Attribute Keys (temperatures, humidity, CO 2 levels, etc) of the measurements values that are requested for specific starting and ending time (StartDateTime and EndDateTime) has to be provided. The web service response will deliver the measured values of the IfcSpace names or GUIDs and Attribute Keys within the time interval requested. The requested values will not be stored in the ROOMEX database. In addition to actual measured data, average, minimum and maximum values can be requested through the IAS to make comparisons with designed values stored in the ROOMEX database. The specific list of requirements is shown in Appendix II. Figure 5: Description of data transfer between BAS and ROOMEX 2.2 Web Service for RYHTI Metrics Figure 6 shows a common data transfer procedure for measured sensor data of a BAS system into monitoring of the energy related system performance management. The procedure starts by obtaining measurements of different parameters such as temperature, humidity, CO 2 levels etc. from technical systems in various location points in a building. Afterwards, the sensor data is stored into the BAS server and later transferred for validation. In many cases, data is exported with file extensions such as xls, csv or txt. After the data is processed and validated it is stored in a central database. The results are later reproduced by the performance management system for monitoring and reporting purposes.
11 page 11/19 Figure 6: Common data transfer procedure To warrant this functionality, an XML converter has been developed to convert the measured data exported in file formats other than XML. In addition, three different BAS data transfer mechanism have been developed utilizing web services. They take into account the wide range variations in BAS systems. Figure 7 illustrates the first concept specification and the different components of the data transfer mechanism. Figure 7: Method 1 for BAS data transfer concept specification
12 page 12/19 The procedure starts with configuring the BAS systems with regard to the schedule for saving sensor measured data to defined folders in the BAS server. In this case, Method 1, the BAS server is directly connected to the BAS systems. However, this is not the most typical case. The XML Converter runs a scheduled service and reads many file formats, later it converts and transfers the information in XML format into the webservice input folder. An example of the Data Transfer XML is presented and described in Figure 4. The data collector client requests the measured information stored according to the defined schedule through the web service. The Data Collector web service receives the request from the data collector client program, reads the information in XML format and sends the information back to the Data Collector Client. Data Collector Client saves the information (raw data) to the database in the IVEL FM Server. Method 2 (Figure 8) is developed for cases that the BAS system works with its own computer. Therefore, it is necessary to use an external server that can allow, for instance, the installation of the XML converter. The procedure is almost identical to the one described in the first method on how the data is requested and answered. Method 3 (Figure 9) is designed for BAS systems that are outdated and are not configured to transfer information through a web service. The data collector client requests the information as usual, but in this case the BAS system is directly connected through the internet with the data collector client. Figure 8: Method 2 for BAS data transfer concept specification
13 page 13/19 Figure 9: Method 3 for BAS data transfer concept specification
14 page 14/19 3. Practical Example: Itäkeskus Shopping Center The task 6.2 was developing data interfaces for the FM IVEL, whereas the FM GUI development will happen later in the task 6.4. To be able to test the developed data interfaces before the FM GUI is ready, a separate practical example was used with an existing BEQ visualization tool prototype developed in an earlier EU project BuildingEQ (Building EQ, 2010). BuildingEQ was a project in the Intelligent Energy Europe Programme of the European Commission ( ). Its goal was to strengthen the implementation of EPBD (Energy Performance of Buildings Directive) by linking the certification process with commissioning and optimization of building performance. The project developed methodologies and tools that could be used for commissioning and optimization along with comprehensive type of reporting that facilitate how to analyze and interpret information concerning the performance of the building. The Itäkeskus shopping center is the largest in Nordic countries with a total area of 120, 300 m 2. The project was constructed in 1984, but it has been through major additions to the area of the complex in 1992 and From 2002 the shopping center has invested periodically in the use of technology and monitoring tools with successful results improving the overall performance of the building. With updating and renovation of building management systems (BMS) major improvements have been measured in many parameters, essentially in energy efficiency and indoor conditions. Figure 10 shows a layout of the 800 locations points that measure actual conditions in the shopping center. The gap has been the large amount of measured information that has been sent manually. Figure 10: Layout example of sensor locations points in the Itäkeskus Shopping Center In task 6.2 the developed web services were installed to automate BAS data transfer and the testing was done by using the BEQ visualization tool as a preliminary GUI. BAS data is transformed in csv format through an ftp server. An example of the data structure of measured temperature is shown in
15 page 15/19 figure 11. It contains information about the sensor location ID, date, time and temperature. As shown in this figure, sensor measurements can contain missing or faulty data. That data needs to be filtered out and processed in order to give accurate measurements for later reporting and analysis. Figure 11: Example of temperature data from BAS in csv format An example of the testing of the developed web services by using the BEQ vitalization tool is shown in Figure 12. While Itäkeskus was used for early testing of the developed data interfaces, it also made possible to involve third party participation to HESMOS for enhanced exploitation purposes. Figure 12: Example of signature type reporting by the BEQ visualization tool for Air Handling Unit
16 page 16/19 4. Conclusions In this deliverable report we presented the developed web services and data interface clients for energy related facilities management. We described the advantages of utilizing web services as the method to integrate data from different sources and present two different use case scenarios, where building automation system data will be integrated into the energy related requirements management and the energy related system performance management. It is important to consider that the report is complementary to the software development, which is the actual deliverable of task 6.2. The development of the two use case scenerios was based on the different usage areas as well as different user groups. Also, they together support both modern/new buildings with web based BAS systems and existing buildings with typically lower levels of BAS systems. This development is very important considering that the current use of BAS systems in not fully exploited to the maximum potential, because the raw data is not integrated or reported in efficient way. Having the integration of BAS and FM tools of the IVEL we will enable the use of information for energy efficiency management. In addition, the testing of the data transfer procedure in the Itäkeskus Shopping Center created early proof of concept as well as important third party involvement already during the progress of the project.
17 page 17/19 References Bai, J., Hao, Y., & Miao, G. (2011). Integrating Building Automation Systems based on Web Services. Journal of Software, 6(11). doi: /jsw Building EQ intelligize your energy management: homepage:: (2010). Retrieved May 21, 2012, from online.net/ CEN. (1997). EN 308:1997. Heat exchangers. Test procedures for establishing performance of air to air and flue gases heat recovery devices. European Committee for Standardization, Brussels. Ihasalo, H. (2012). Transforming building automation data into building performance metrics design, implementation and evaluation of use of a performance monitoring and management system. Unpublished Doctoral Dissertation. Aalto University, Espoo, Finland. ISO/PAS (2005): Industry Foundation Classes, Release 2x, Platform Specification (IFC2x Platform). International Organization for Standardization, Geneva, Switzerland. Mills E. (2004): Inter comparison of North American residential energy analysis tools. Energy and Buildings 36(9), pp , Tom, S. (2004). Web Services & BACnet. BACnet Today A Supplement to the ASHRAE Journal.
18 page 18/19 Appendix Appendix I: Acronyms and abbreviations AHU BAS BIM BMS eebim GUID IAS IFC IVEL XML Air Handling Unit Building Automation System Building Information Modelling Building Management System Energy Enhanced Building Information Modelling Global Unique Identifier Intelligent Access Services Industry Foundation Classes Integrated Virtual Energy Laboratory extensible Markup Language
19 page 19/19 Appendix II: Requirements for BAS Web Service Interface To specify the objects for the request: List of spaces Space GUID or Space name for each listed space To specify time period: Date and time for the start Data and time for the end To specify the kind of monitored data: Choose from temperature, humidity, CO 2 levels and concrete core temperatures. For each data type, choose: Hourly: List of hourly average values of sensor in the space Maximum: Maximum value through the requested time period during occupancy hours Minimum: Minimum value through the requested time period during occupancy hours.
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