The HosPilot project develops a service able to propose the most efficient technical solutions about HVAC (Heating, Ventilation, Air Conditioning) and Lighting for refurbishing a hospital. At the same time, it will help to increase well-being and comfort for the end users. The service will be distributed as a software tool designed for decision makers of hospital.
A model for the system deployment of the HosPilot project: the Hospital District of South Ostrobotnian (EPSHP), in Finland. It provides healthcare for 26 municipalities with about 190 000 inhabitants. This hospital is divided into 3 parts: 2 general hospitals and one psychiatric hospital. Seinäjoki Central Hospital was built in 1979, the extension building in 2005 and the new hospital building in 2009. The EPSHP hospital employs 2 300 people, have 618 beds and the hospital district spreads over 75 000m².
The EPSHP pilot has 2 main interests for the HosPilot project:
- The whole second floor of the h-building acts as pilot area. One half is renovated with standard equipments; the other half is equipped with new Information and Communication Technologies (ICT). Then by pairing identical room side by side of each part, it is possible to compare the total electricity usage.
- As the EPSHP hospital has a number of buildings which are not set up with technologies allowing energy savings, it is possible to compare the energy consumption. To allow comparisons, total energy consumption metering was installed in all buildings. As a result, if the technologies used are efficient, the hospital will be more inclined to invest in energy saving methodologies.System information
The hospital already uses a TAC Supervisory Control and Data Acquisition solution (SCADA) from Schneider. It provides solutions for energy management, such as detailed information about HVAC and electricity. But as the information are not accurate enough, an upgrade of the system is necessary to collect more detailed data without interfering with the normal operations and maintenance functions in the other parts of the hospital.
To be used, it was decided to add a new server in the hospital, used as a virtual part of the TAC system, to collect data to a separate database. Then by synchronizing the databases of the servers, this data is linked to a server hosted at VTT (Technical Research Centre of Finland) facilities and which is used for analyzing and visualizing the data.
So the TAC’s Vista 5 version has been upgraded to make it possible to use all existing Local Outed Network (LON) and new MODBUS installations. MODBUS is the standard communications protocols in the industry, and it is used to connect industrial electronic device.
The system produces automated monthly reports of energy usage that will mainly be used by maintenance personnel.
Lighting: The lighting of one part of the floor is composed of new technologies equipment, such as LED-solutions and presence detection sensors. Measurements are compared with the other half of the floor equipped with conventional technical solutions. In the first part, the installations include DALI-gateway technology. The corridor lights are decreased by 10% thanks to PIR sensors outside office-hours. On each part of the floor, the monitoring system allows to measure the lighting consumption independently from the whole electricity consumption.
There is a rough estimate to save from 20 to 30% of electricity with the new technologies in relation to the conventional technologies.
HVAC: On patient rooms and meeting rooms, different HVAC components are implemented.
- Air flow control (variable air volume: VAV) based on occupancy, room air temperature and room air quality.
- Air flow control (minimum flow/normal flow) based on occupancy only;
- Occupancy controlled heating;
- Window and door switch activated energy saving mode for air flow and heating control.
The energy performances of these advanced technologies are benchmarked to the other rooms equipped with a basic HVAC solution that is to say without any air flow control system, and heating control by simple thermostatic radiator valves (TRV).
Energy savings implemented by the use of intelligent systems about HVAC are usually estimated up to 20%.
Here are some examples of plans of rooms with their equipment concerning HVAC integration. The occupancy sensors are also used for lighting automation.
Hardware: Most advanced solutions concerning hardware are put in place, such as:- VAV terminal devices;
- Air flow control dampers and damper actuators
- Room controllers;
- Motorized radiator valves;
- Room temperature sensors;
- Room air quality sensors;
- Occupancy sensors;
- Door and window switches;
- User interface devices;
- DALI-network gateway;
- Wireless sensor network gateway.
All controls are implemented with room controllers communicating over a LonWorks field bus connected to the hospital building automation system via IP-network.
Lighting and HVAC controllers and user interface devices share information, such as room occupancy, over the LonWorks field bus.
Wireless communication is used for some window and door switches.
Monitoring includes a total of 254 channels (e.g. temperature) and 206 status channels (e.g. presence of somebody or not). Data channels are sampled every 600 seconds and the monitoring of the status channels is “timestamping” status change events. The SQL database in the TAC Vista server is synchronized via SSL with the VTT HosPilot server. The data are used for validating calculations of energy savings, and show the status of the measurements in real time through services like iPhone/iPad and the Internet.
Here are some screenshots about lighting and HVAC controllers and user interface devices.
Green dots indicate that a presence was detected recently, and grey dots indicate that there has been no movement in the room for a long period.
Mobile Service for iPhone and iPad
The monitoring data, located in the VTT HosPilot server, is used to create and test an iOS service. The main objective of this service is to show all the monitored data through an iPad or an iPhone application.
For example, the service is producing a graph of various data concerning a selected sensor device or energy meter, etc. Then it sends this information to a mobile device, using an Obix gateway and SSl.
Furthermore, the service is planned to show the comparison between the actual value and the simulated value.
For example, real data of total energy consumption of a specific room can be compared to theoretical simulated values which are calculated according to building’s characteristics.