Technical manual

SOLAR

4.4 Dimplex solar expansion vessels SOLEV

4.4.1 General description

Dimplex solar offer an extensive range of expansion vessels from 18 to 80 litres. All expansion vessels are particularly suited for the application in solar thermal systems with a high temperature resistant membrane which has also excellent diffusion barrier characteristics in conjunction with the heat transfer medium used in solar thermal sys- tems.

In solar thermal systems the expansion vessels has a number of functions to ensure the safe and reliable operation of the system:

- absorption of additional system volume when system is heating up during normal op- eration

-absorption of steam volume of system when installation enters stagnation

-holding of medium reserve when system temperature drops below fill temperature

4.4.2 Expansion vessel sizing

A number of parameters have to be considered when sizing the expansion vessel. The parameters to be considered are:

-total system volume

-static height of system

-expansion coefficient of heat transfer medium

-opening pressure of pressure relief valve

-required pressure in highest system point

-number of collectors installed

-fluid content of each collector

Applying the above system parameters, Equation 5 can be used to calculate the expan- sion vessel size VEV, the cold fill pressure of the system and the membrane pre-charge pressure of the expansion vessel.

VEV

=

(V pc + Vep

+ n ⋅Vcol )⋅ (prv + 1)

[5]

( prv − p pc ) ⋅ 0.6

 

 

 

 

Where: VEV

[l]

minimum expansion vessel volume

 

 

Vpc

[l]

pre-charge volume

 

 

Vep

[l]

system expansion volume

 

 

n

[-]

 

number of collectors connected to expansion vessel

 

 

Vcol

[l]

collector volume (SOLC220 = 1.7 litre)

 

 

prv

[bar]

relief valve pressure

 

 

ppc

[bar]

cold fill pressure

Equation 6 is to be applied to determine the expansion vessel pre-charge volume Vpc.

V pc = 0.005 ⋅Vsys

≥ 3litre

[6]

Where: Vpc

[l]

pre-charge volume

Vsys

[l]

total system volume

 

 

Page 32 of 72

 

 

ST0133 – A 02/09

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Dimplex ST0133 technical manual Dimplex solar expansion vessels Solev, Expansion vessel sizing
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ST0133 specifications

The Dimplex ST0133 is a sophisticated and efficient electric heating solution designed for modern living spaces. This product is an ideal choice for those seeking warmth and comfort without compromising on style or energy efficiency. The unit stands out due to its sleek design, making it a perfect fit for contemporary interiors.

One of the key features of the Dimplex ST0133 is its impressive heat output. With a power rating that effectively caters to various room sizes, it ensures consistent warmth, even during the coldest winter months. This makes it suitable for a variety of settings, from cozy homes to larger commercial spaces.

The Dimplex ST0133 is equipped with advanced heating technology that utilizes a unique convection system. This system efficiently warms the air in the room, creating a comfortable environment without the need for bulky radiators or traditional heating methods. The unit heats up quickly and distributes warmth evenly, eliminating cold spots and ensuring a pleasant atmosphere.

User control is another strength of the Dimplex ST0133. The unit features a user-friendly digital control panel that allows for precise temperature regulation. This enables users to set their desired comfort levels easily. Additionally, the programmable timer helps save energy by allowing users to set specific heating schedules, resulting in reduced electricity bills.

Safety features are paramount in the Dimplex ST0133 design. It is equipped with a thermal cut-out system that prevents overheating, ensuring safe operation even in prolonged use. The unit is also designed with a child lock feature, providing peace of mind for families with young children.

In terms of aesthetics, the Dimplex ST0133 is available in various finishes, allowing it to blend seamlessly with different home decors. Its modern look adds an elegant touch to any room while maintaining a low profile.

Moreover, this electric heater is easy to install and requires minimal maintenance, making it a practical choice for homeowners and businesses alike. Overall, the Dimplex ST0133 combines style, efficiency, and safety, making it a leading option in the realm of electric heating solutions. It is an intelligent investment for anyone looking to enhance their living space with reliable and modern heat.
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