Thermal Stores


Thermal Store Cylinders. Thermal Store installers Solo Heating InstallationsThermal store cylinders are used as a store of energy for the hot water and central heating system. The tank-in-tank design thermal store consists of an unvented hot water cylinder sealed inside another larger cylinder. The larger cylinder being the central heating system fluid and the hot water cylinder holding the hot water for use in your home. The picture right shows a NIBE tank-in-tank VPA thermal store cylinder.Thermal Store Cylinder

Thermal stores allow multiple heat sources to contribute to the entire heating system. If we are looking at docking solar panels or a wood burning stove to our thermal store, there are different designs which incorporate a separate coil towards the bottom of the tank. This coil allows docking from such sources as wood burning stoves, solar panels and pellet stove boilers. (NIBE VPAS Thermal Store Cylinder with Solar Coil)

Solo Heating Installations will use thermal stores with nearly all of its renewable energy systems. These cylinders act as buffer tanks, which eliminate the cycling of an appliance (constant turning on and off). Without a thermal store cylinder in the system, when an appliance such as a ground source heat pumps starts to heat the hot water for the property, the heat pump will contribute energy to the cylinder but quickly turn itself off once that demand has been met. A thermal store allows a prolonged operation for the heat pump, which keeps the efficiency of the heat pump high and the energy bills low.

 

NIBE VPA Thermal Store Installation Guide

Thermal Store Docked to Pellet Stove Boiler and Air Source Heat Pump

Thermal Store Docked to Solar Panels and Air Source Heat Pump

Thermal Store Docked to Ground Source Heat Pump

Thermal Store Docked to Solar Panels and Ground Source Heat Pump

 

Shown above are some typical thermal store and renewable energy installation diagrams. Solar panel docking to a thermal store is completed in much the same way as a wood burning stove docked to a thermal store. The wood burning stove uses the extra coil in the thermal store which keeps the wood burning stove circuit separate from the rest of the system.

Thermal stores don't have to just be used with renewable energy systems. They can give many benefits to simple oil or gas boiler systems. The fact a thermal store reduces cycling of an appliance will result in fewer services for the appliance and less break downs. They will also allow condensing boilers to run in condensing mode for as much time as possible; condensing mode being the most efficient operation of a condensing boiler.

 

NIBE Thermal Store Cylinders


NIBE VPA Thermal Store
Cylinder Leaflet Download 1140 Ground Heat Pump Technical Information

 

 

Thermal Stores And Heat Pumps Installed By Solo Heating. Ground Source Heat Pump Thermal Stores with Solar Input


How do thermal stores work ?


Thermal store cylinders work on the principles of stratification. This describes the process of hotter water rising to the top of a cylinder, with the cooler water towards the bottom. Each level of the cylinder therefore stratifies into a different temperature, and its these temperature 'zones' that we connect heat sources. The height of a thermal store allows us to achieve many stratification layers, compared to a standard unvented hot water cylinder which are traditionally shorter.

Underfloor heating, which works at lower temperatures, would be connected towards the bottom of the cylinder. The hot water tank is at the top of the cylinder, where the hottest temperatures are found. If solar panels are to be docked to the cylinder then they would go at the very bottom of the cylinder, normally where the cold water supply enters the cylinder. All connections are made to give the maximum gain from each of the heat sources.

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Ground and Air Source Heat Pumps Installed With Buffer Tanks By Solo Heating. Buffer Tank Installers with Heat Pumps


Buffer Tanks


These tanks are combined with units such as the ground source or air source heat pumps. They are a tank of the heating system water, positioned between the heat source (heat pump), and the rest of the heating system. They allow the heat pump to charge the tank with heat energy, which can be extracted or NIBE UKV Buffer Tank. Buffer Tank installation for use with Air Source and Ground Source Heat Pumps.taken away by the rest of the heating system.

These are required with underfloor heating systems when installed with thermostatic control for each zone. Without the buffer tank, the heat pump would come on when a heating requirement is sensed by a thermostat, but then turn off very quickly when that heating requirement has been met. This would cycle the heat pump and reduce the compressors operational life span.

Good system design would always ensure the buffer tank is the heating systems neutral point, with all heating either being taken from the buffer tank or supplied to the tank. In other words, a flow and return from the air / ground source heat pump, and a flow and return from the underfloor heating or radiators.


NIBE Buffer Tank


NIBE Buffer Tank
Cylinder Leaflet Download 1140 Ground Heat Pump Technical Information

 

 
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