Heating of tap water and heat transferring in double jacketed heaters
The system consists of:
1. All water filled in a heater and heating storage comes from community water. The heating storage is not pressurised, and have a max-limit, which means if there is to much water in the tank, it will pour into a overflow at the top of the tank. The overflow can be connected to a drain. The cold community water (consumption water)is pre-heated in the coiler of the heating storage, before being led to the heater, where the water is post-heated after necessity. This water is used for tap water/ shower water.
2. At the bottom of the heat storage and in the lower part of the solar panel, there are sensors (S2 and S1), which determine when the steering unit must supply electricity for the solar panel pump (P1). The pump starts when S2 and S1 feels that the temperature in the heat storage is lower than in the solar panel.
3. The water in the solar panel is pumped through its own pipe system from bottom to the top of the panel. The solar panel has a green house effect and heats the water as it moves along. The hot water exits at the top of the panel and pours back into the heating storage.
4. The water inside the heating storage will continue ti circulate until the pump (P1) stops, which is either when:
- S1 and S2 has the same temperature
- The heat storage has too high temperatures
- The solar panel has too low temperatures
5. The warmest water will lie on top of the heat storage, while the cold water will sink to the bottom. The hot water in the heat storage pre-warms the water circulating through the coils in the heat storage. This helps bring down the consumption of electricity in the water heater.
6. The water heater in system illustration 2 is double mounted, which means it has an inner and outer container. The outer container is filled with water which can be pumped in a water heating system, like a radiator, water piping in floors, and wall heating-systems. The temperature can go down to ca 28 degrees in the area where the coil is mounted. The heat storage has an extra sensor (S3) in the top part which will start pump 2 (P2) when the temperature is 30 degrees or more in the heat storage of the solar panel. The hot water from the heat storage is pumped through the coil in the outer container, and submits heat. The water inside the coil will then pour into the heat container with lower temperature after submitting heat.
System drawing 1
System drawing 2
Heat storage: A water-tank which holds hot water from the solar panel
Steering unit: A differentiating thermostat which starts the solar panel pump
Plate heat exchanger: A unit which transfers heat energy between two fluids with different temperatures without mixing them.
Coil: Two or three elements in the heat storage which switches heat for different heating needs.
Community water: Water used for shower and tap water.
Solar panel circuit: The pipe system leading from the heat storage, through the entire solar panel and back into the heat storage again.
Shunt Valve: A unit mixing water into the right temperature in connection with the water heating construction.
Setback Valve: A connection to the pipe system in the heat storage which controls the movement of the water.
Circulation pump: A unit pumping water from the container, through the solar panel circuit.