Constant volume chamber (IH)#

The Constant Volume Chamber (IH) block simulates the accumulation of mass and energy in a chamber containing fixed volume of coolant.

Hint

The user can specify from 1 to 4 input ports, through which the coolant flows.

The medium enters the chamber the pressure upstream the inlet exceeds pressure in the chamber and flows out when pressure drop is reversed.

It is assumed that the flow resistance between the inlet and the chamber internal part is negligible. Thus, pressure inside the chamber is equal to pressure at the inlet ports.

Similarly, thermal resistance between the thermal port and chamber internal part is negligible and temperature inside is equal to temperature in the thermal port.

Mass flow rate calculation

Law of conservation of mass (1):

(1)#\[\dot{m_1}+\dot{m_2}+\dot{m_3}+\dot{m_4}=(\frac{1}{\beta}\cdot\frac{dp}{dt}-\alpha \cdot \frac{dT}{dt})\cdot \rho \cdot V\]

where:

p - medium pressure in the chamber, [Pa];

T - medium temperature in the chamber, [℃];

\(\alpha\) - isobaric thermal expansion coefficient, [1/К];

\(\beta\) - fluid bulk module, [Pa];

\( ho\) - medium density in the chamber, [kg/m\(^3\)];

V - chamber volume, [m\(^3\)];

\(\dot{m_1}\), \(\dot{m_2}\), \(\dot{m_3}\), \(\dot{m_4}\) - Mass flow rate through input ports, [kg/s].

Pulse balance

p=p\(_1\)=p\(_2\)=p\(_3\)=p\(_4\)

where \(p_1\), p\(_2\), p\(_3\), p\(_4\) - input port pressure, [Pa].

1. Properties#

Property	Default value	Description	Units of measurement
Number of ports: 1; 2; 3; 4	2	-	-
Chamber volume	0.01	-	m\(^3\)
Area port 1	0.01	-	m\(^2\)
Area port 2, available when `Number of ports` is `2`, `3` or `4`	0.01	-	m\(^2\)
Area port 3, available when selecting `Number of ports` - `3` or `4`	0.01	-	m\(^2\)
Area port 4, available when selecting `Number of ports` - `4`	0.01	-	m\(^2\)
Initial chamber pressure	0.0	-	Pa

2. Inputs and outputs#

Parameters	Input/Output	Description	Units of measurement	Port type
Input	Input	From 1 to 4, depending on the property selection - `Number of input ports`	-	Isothermal hydraulics

In order to see the connection capabilities of the block, you need to go to page Description of block ports