Analyses of the Oil Management in High-Temperature Heat Pumps and Modelling of the Oil-Refrigerant Separation

Due to financial and environmental benefits, the interest in high-temperature heat pumps, producing heat sinks above 100 °C, is rising. Research is intensifying, and technology is developing fast. However, of all the components of the heat pump cycle, the oil management system seems to be the least investigated, even though 12% of the faults in...

Using Peltier elements in low temperature district heating networks

By placing multiple Peltier elements in a linear arrangement while two water flows run past the elements, a temperature increase can be realised in one flow while the other flow is cooled down. In this study the heating of domestic hot water with Peltier elements as solid state heat pumps, and a heating network was investigated. A numerical...

Importance of Model Fidelity of Power to X Devices in Energy System Analysis

Power-to-X (PtX) technologies are accelerating the energy transition. Increasingly, these technologies are also being leveraged as flexible energy resources to support the electrical grid. PtX models are often represented using a constant efficiency term as a linear relation between the power input and energy output. However, the operational...

Heating system based on heat recovery from sewage

Buildings consume 40% of the total global energy and contribute to over 30% of all CO2 emissions. Space heating forms a significant part of energy consumption in buildings. A possible solution is to recover waste heat from sewage and to upgrade its exergy using a heat pump. Polymers reduce cost and energy required for manufacturing the heat...

Investigating Hidden Flexibilities Provided by Power-to-X Considering Grid Support Strategies

Highly volatile nature of renewable energy sources (RES) has increased the demand for flexibility in electrical power systems. Electrification of the industry with power-to-X (PtX) technologies is one of the most promising ways to increase energy system flexibility since industry accounts for the largest share of the world’s total energy demand....

Assessment of machine learning algorithms for the purpose of heat pump detection based on load profiles and temperature readings

The aim of this research thesis is to use machine learning models to distinguish owners of heat pumps from non-owners of heat pumps based on load profiles and temperature data only. As is the case with data mining project, its workflow can be divided into business understanding, data gathering, analysis, modeling and interpretation and...

Integrating Installations into a Zero-Energy Renovation

In order to counter climate change many approaches have been taken to make<br/>the building sector more sustainable. But for porch houses there aren't many<br/>solutions on the market. This research project uses one of the approaches that<br/>is does focus on porch houses, 2ndskin. In march 2018 a demonstrator project<br/>has been build in...

Energy transition for space heating in Ramplaankwartier

This research is about the spatial integration of a self-sufficient renewable energy system in selected urban blocks in the neighbourhood Ramplaankwartier in Haarlem, providing the heat demand of the residential buildings located in these selected urban blocks. Solar energy production and thermal energy storage are the selected energy production...

Performance analysis of double-effect absorption heat pump cycle using NH₃/ILs pairs

Ionic liquids (ILs), as novel absorbents, draw considerable attention for their potential roles in replacing H2O or LiBr aqueous solutions in conventional NH3/H2O or H2O/LiBr absorption chiller or heat pump cycles. In this paper, NH3/IL working pairs are proposed for implementation in parallel double effect heat pump systems. To investigate...

Heat Recovery in the Drying Process of Milk Powder by Using a Liquid Sorption System

The last step in the production of milk powder is drying, a very energy intensive process that demands 30% to 40% of the total energy input of a typical plant. It takes place in Spray Dryers (SD), where concentrated milk is sprayed and placed in direct contact with hot and dry air that cools down and gains humidity as water is evaporated from...

Screening criteria for ILs used in NH₃ based absorption heat pump systems

This paper describes a properties-optimization work for the working fluids in NH3 / ionic liquid (ILs) based single-effect absorption heat pumps. The optimum parameters of the IL can be used as criteria in screening task-specified ILs, which play the role of absorbents, in absorption heat pumps. First, a 8-parameter thermodynamic model to...

Energy Storage Strategies

This report describes the development of energy storage strategies for short term Thermal Energy Storage in residential buildings with an air-source heat pump. Short term TES allows advanced integration of renewables because the associated mismatch between demand and availability is solved. The aim of the research was to develop control...

Design and analysis of a heat pump applied to old apartment buildings

Newly build buildings in the Netherlands are quite sustainable but are currently less that 5% of the total amount of buildings. Cooperative building societies are getting requirements from the European Union which they have to meet in a few years (Action Plan for Energy Efficiency: Realising the Potential). The target is to reduce the current...

Hybrid adsorption compression heat pump systems: Configuration study & dynamic modeling

Evaluation of hybrid adsorption compression heat pump & heat transformer performance.

Heat pump for comfort, with added energy savings

The high-efficiency central heating boiler is about to reach the limits of its potential, so innovative insulation and other energy efficiency solutions are required, even though energy consumption in the Netherlands per household has dropped by 70% since 1986. Now that houses and offices are being fitted with increasingly efficient winter coats...