IBPSA2013

This paper focuses on the optimization of control strategies with regard to the end energy consumption and the thermal comfort of low-exergy systems for space heating in non-residential buildings. The sur-vey building uses a small-scale heat pump system (2.8 kWtherm) with a floor heating system. Firstly, the thermal as well as the hydraulic system was modeled in Modelica. The control parameters of the applied conventional control strategy were investigated con-cerning their impact on the end energy consumption and the thermal comfort.

Today’s thermostat setpoint models naïvely assume fixed schedules, ignoring the reality of user control and its large variability. Better models must include more realistic user-behavior profiles to correctly evaluate the energy benefits of the next generation of thermostats against a realistic baseline. Data from a recent thermostat field study were analyzed to demonstrate the variation and patterns associated with manual adjustment of programmable thermostats and its consequences on observed and simulated energy consumption.

This paper investigates a new system for balancing the electrical grid by using dynamic simulation. It con-sists of a fuel cell that runs continuously to achieve high efficiency. To have the possibility to react to fluc-tuations in the electrical grid, the system additionally contains a certain number of heat pumps that use the electrical energy provided by the fuel cell, if it does not need to be fed into the grid. Thus, the system gen-erates and consumes power while keeping the grid in balance.

This paper describes the development of a simulation model using TRNSYS of a building integrated ground source heat pump with a cold phase change material thermal energy storage unit in a lightweight commer-cial building located in Marseille, France. The de-velopment of the overall system model involved the construction of individual models to simulate various components in the building, including a PCM tank, fan coil units, pumps, an air handling unit and the heat pump.

Context:  The case study presented here was carried out to assist the designers in making a decision about the use of chilled ceiling panels coupled with an air handling unit in a data center with limited usable ceiling area. Project Description:  A continually operational data control center, located on the sixth floor of a triangular-shaped building was used for this study. The building is located in Frankfurt, Germany. The tenants requested a constant 22°C operative temperature for the space while the outside air temperature is below 26°C.