Abstract
The ZEB Lab project, coordinated by SINTEF and NTNU, aims at building a ZEB (Zero Emission Building) in Trondheim (Norway) in 2019, to be used both as office building and living laboratory. An innovative latent heat storage (LHS) unit using phase change material (PCM) will be integrated in the centralized heating system. The LHS unit will be able to store excess heat from various heat sources connected to the heating system, when they are not required for space heating. One challenge is to make use of the full potential of the PCM latent heat to have a compact and effective unit, while the unit itself should have a low associated CO2-footprint. The LHS system consists of two units designed for a total heat storage capacity of 0.6 MWh, corresponding to the heat needed on top of the heat pump to cover for up to 3 consecutive days in the coldest period of the year, with a maximum combined effect of 26 kW. A bio-based wax is used as PCM with melting temperature 37 °C and measured latent heat 198 kJ/kg. Dynamic system modelling is used to support the design of the LHS unit and ensure sufficiently high heat transfer rates.
Highlights
IntroductionAn essential asset of the latent heat storage (LHS) unit is to be able to provide high heat storage capacity and heat effect within the narrow temperature range offered by low-temperature heating
The latent heat storage (LHS) unit will be able to store excess heat from various heat sources connected to the heating system, when they are not required for space heating
The charging or discharging time is defined here as the time required for the average temperature of the phase change material (PCM) in the LHS unit to reach the heat transfer fluid (HTF) inlet temperature
Summary
An essential asset of the LHS unit is to be able to provide high heat storage capacity and heat effect within the narrow temperature range offered by low-temperature heating. The stored heat will be released either to provide heat directly to the heating circuit or to support the heat pump by compensating for a drop of return temperature below the optimal intake temperature. Since such LHS technology is not commercially available yet, an experimental unit has to be custom-designed following the best integration path in the heating system
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