Vattenfall has filed a patent for a heating system that includes a heat pump arrangement, a stratified heat storage device, a mixing arrangement, and a control device. The system is designed to regulate the temperature of the fluid entering and returning from the heating distribution system. The heat pump arrangement heats the fluid and the stratified heat storage device stores the fluid at different temperatures. The patent also covers a method for controlling the heating system, a computer program, a computer-readable medium, and a control device. GlobalData’s report on Vattenfall gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData s company profile on Vattenfall, V2G payments was a key innovation area identified from patents. Vattenfall's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.

A heating system with heat pump and stratified heat storage

Source: United States Patent and Trademark Office (USPTO). Credit: Vattenfall AB

A recently filed patent (Publication Number: US20230148376A1) describes a heating system that is designed to be connected to a building's heating distribution system. The system includes a heat pump arrangement, a stratified heat storage device, a mixing arrangement, and a control device. The heat pump arrangement heats a fluid and supplies it to the heat storage device, while also subtracting ingoing fluid from the storage device. The storage device then supplies fluid to the heating distribution system and receives returning fluid from it. The mixing arrangement regulates the temperature of the fluid entering the heating distribution system and controls the temperature of the returning fluid. The heat pump arrangement supplies the outgoing fluid to the storage device at a minimum temperature of 55°C, while the ingoing fluid subtracted from the storage device is at least 20°C lower than the outgoing fluid temperature. The storage device includes a stratifier inlet device for distributing returning fluid within it, and the system also features a bypass arrangement for bypassing the storage device during the start-up of the heat pump arrangement.

The patent also describes a computer-implemented method for controlling the heating system. The method involves heating a fluid and storing it at differentiated temperatures in the stratified heat storage device. The temperature of the fluid entering the heating distribution system is regulated in the mixing arrangement, and the return of the returning fluid from the distribution system to the storage device is controlled to ensure a temperature difference of at least 10°C within the storage device. The method can be performed using a heat pump arrangement or an electric heater arrangement. The control of the heat pump arrangement includes heating the fluid to achieve an outgoing temperature of at least 55°C. The method also involves regulating a mix of top section fluid, midsection fluid, and returning fluid in the mixing arrangement, and controlling the fluid flow through the heating distribution system and/or withdrawing returning fluid back to the mixing arrangement based on temperature thresholds.

In addition to the heating system and method, the patent also covers a computer program and a computer-readable medium containing instructions for carrying out the method, as well as a control device specifically designed for controlling the heating system. Furthermore, the patent mentions a method for retrofitting an existing heating system in a building using the described heating system.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies