{"id":117699,"date":"2023-08-17T09:13:15","date_gmt":"2023-08-17T07:13:15","guid":{"rendered":"https:\/\/www.velasolaris.com\/handbuch\/cold-water\/"},"modified":"2025-10-20T12:43:49","modified_gmt":"2025-10-20T10:43:49","slug":"cold-water","status":"publish","type":"handbuch","link":"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/transfer-circuit\/cold-water\/","title":{"rendered":"Cold Water"},"content":{"rendered":"\n

Cold Water Temperatur<\/h1>\n\n\n\n

In Polysun<\/a>, the cold water temperature can be simulated precisely to ensure realistic system behaviour. The software takes regional differences into account and allows cold water temperatures to be entered via a file, which is particularly important for district heating systems or specific local conditions.<\/p>\n\n\n\n

Cold Water Calculation<\/h2>\n\n\n\n

In the dialog window of the \u2018Cold water\u2019 the calculation method of the cold-water supply can be opened by clicking on the tap image in the system diagram. The cold-water temperature influences the energy demand for domestic hot water. By decreasing the cold-water temperature, the difference between set point of hot water and cold water inlet increases, which leads to a larger energy demand. <\/p>\n\n\n\n

\n
\"\"
Figure: cold water element on the system diagram<\/figcaption><\/figure>\n<\/div>\n\n\n\n

There are three methods available, such as \u2018Automatic\u2019, \u2018Catalog\u2019 and \u2018From file\u2019.<\/p>\n\n\n\n

\u2018Automatic\u2019 calculation method of the cold water supply depends on the location chosen in the \u2018Location of the system\u2019 in project settings. Distribution of the cold water supply is calculated by the embedded Polysun procedure and depends on the weather data for the given location.<\/p>\n\n\n\n

\u2018Catalog\u2019 method allows choosing the appropriate cold water supply profile from the catalog.<\/p>\n\n\n\n

\n
\"\"
Figure: selection of the cold water supply from the catalog<\/figcaption><\/figure>\n<\/div>\n\n\n\n

The main parameters, which are defined in the catalog are: the mean temperature [\u00b0C], temperature range [K] and warmest month.<\/p>\n\n\n\n

The mean temperature \u2013 cold water mean temperature in a year.<\/p>\n\n\n\n

Temperature range \u2013 differences between the mean temperature and the highest temperature and the highest temperature during the year.<\/p>\n\n\n\n

Warmest month \u2013 month with the highest cold water temeperature.<\/p>\n\n\n\n

According to these parameters monthly values are calculated for the whole year.<\/p>\n\n\n\n

It is also possible to change the values of the parameters if the suitable ones were not available. In order to do that, you can simply copy any line from the catalog with a new name assigned and then you can introduce any changes in the given line by clicking on the \u2018pencil\u2019.<\/p>\n\n\n\n

\n
\"\"
Figure: editing cold water supply in the catalog<\/figcaption><\/figure>\n<\/div>\n\n\n\n

The third method \u2018From file\u2019 gives an opportunity to add available measured data from a file. In order to do that you can also first make a copy of the catalog with a new name, then click on the pencil and then open the *.csv file in the catalog.<\/p>\n\n\n\n

The possibility of using the cold water temperature from a file makes Polysun flexible enough to use it also as inlet temperature for district heating systems, outlet (warm) temperature will be in this case the hot water demand.<\/p>\n\n\n\n

\n
\"\"
Figure: selection of the cold water supply from file<\/figcaption><\/figure>\n<\/div>\n\n\n\n

In the spreadsheet file the temperatures for the cold water supply are given with a 6 minute time step size. This file can be changed with measured data and saved under the new name.<\/p>\n\n\n\n

\n
\"\"
Figure: cold water supply temperature in 60-minutes-steps in the spreadsheet file<\/figcaption><\/figure>\n<\/div>\n\n\n\n

In order to choose the changed profile, you may click once again on the profile in the catalog and then choose \u2018Select File\u2019.<\/p>\n\n\n\n

\n
\"\"
Figure: selection of the previously edited profile<\/figcaption><\/figure>\n<\/div>\n\n\n\n

The cold water distribution can be found in the Component results \u2013 Cold water tab.<\/p>\n\n\n\n

An example for the profile \u201cNorthern Europe\u201d is shown below.<\/p>\n\n\n\n

\n
\"\"
Figure: cold water distribution in the component results<\/figcaption><\/figure>\n<\/div>\n","protected":false},"author":19748,"featured_media":0,"parent":138453,"menu_order":32,"comment_status":"closed","ping_status":"closed","template":"","class_list":["post-117699","handbuch","type-handbuch","status-publish","hentry"],"acf":[],"yoast_head":"\nCold Water - POLYSUN<\/title>\n<meta name=\"description\" content=\"Simulate cold water temperature for accurate energy system design. 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