COOLSTAR programme modules

System requirements

Windows 7 to 10. Server environments on request.

Basics and general settings for working with COOLSTAR

To achieve optimum dimensioning and calculation results using COOLSTAR, it is necessary to carry out some basic settings after starting the programme for the first time.


Almost all calculations are based on the thermodynamic equations of state for the following refrigerants:

R 12, R14, R22, R23, R32, R125, R134a, R152a, R227ea, R290, R600, R600a, R717, R723, R744, R1150, R1224yd(Z), R1233zd(E), R1234yf, R1234ze(E), R1234ze(Z), R1270, R1336mzzZ as well as all common cooling mixtures from R401A to R472A and R502 to R516A


Water, Antifrogen N, Antifrogen L, Antifrogen KA, Antifrogen KF, Fragoltherm X-T9, Fragoltherm X-T12, Fragoltherm X-T15, HYCOOL 20, HYCOOL 30, HYCOOL 40, HYCOOL 45, HYCOOL 50, Freezium, Glykosol N, Pekasol L, Pekasol 2000, Syltherm XLT, Temper -10, Temper -15, Temper -20, Temper -30, Temper -40, Temper -55, Therminol D12, Thermogen, Tyfocor, Tyfocor L, Tyfoxit, Tyfoxit F, Zitrec MC, Zitrec LC


All theoretic values of the single stage compression will be calculated quickly and exactly.

The refrigeration circuit can be calculated either with or without pressure drops. The calculated values will be shown graphically in a h log p diagram. The respective values of each point in the diagram will be shown in a table by mouse click.

COOLSTAR: Single-stage compression with and without internal heat exchanger

This module works with all refrigerants mentioned above.

Additionally, you may select the intermediate pressure. In the h log p diagram, you may click on every point to get the exact values.

COOLSTAR: Two-stage compression with open intermediate cooler in the h log p diagram

Calculation with all refrigerants is possible here, too; also with graphics of the circuit processes in a h log p diagram. A thermodynamic table is also offered.

COOLSTAR provides you with all pipes of the calculated circuit processes. the geodetic height difference is evaluated as a pressure loss or pressure increase. When selecting the suction or discharge line, COOLSTAR automatically verifies if all conditions for a perfect oil transport are fulfilled. If necessary, tapering the lines will be proposed. Furthermore, double rising lines can be calculated.
The operating points are displayed in an oil diagram for visual control. All lines can be changed manually by the user.

At the same time, all desired components such as shut-off, solenoid, non-return, expansion valve, dryer and sight glass are designed, and the insulation required to prevent the dew point being undershot is dimensioned. The calculation is rounded off by determining the refrigerant charge. The calculation results are clearly presented in tabular form.

COOLSTAR: Calculation of piping

This module has been developed especially for compound systems. Within a very short time you may design all refrigerant-containing pipings in compound systems with several cooling units and compressors, even including the suitable solenoid, expansion and shut-off valves. The suction line can be calculated with two different evaporating temperatures especially for booster systems. All other fittings for the compound (check valves, driers, sight glasses, etc.) are calculated as well.

Selection and arrangement of the cooling units may be placed easily right on the screen by using the mouse. There is no rigid pattern. Like in the calculation of pipelines, rising lines are verified for a perfect oil transport and, if necessary, the lines are tapered or split.

Both the number of existing or required compressors and the factor of simultaneousness can be selected.

COOLSTAR draws up a list of material for the calculation, a list of piping for your fitters on the building site, a list of components for each cooling unit and a list of rising lines with the required double rising lines. Verifying calculations of existing piping nets are possible as well.

COOLSTAR: Calculation of piping net

COOLSTAR enables you to calculate solenoid valves of the manufacturers

  • ALCO
  • GSR
  • ODE

for liquid, suction gas and pressure gas lines. The valves will be selected covering the cv value and under consideration of the minimum pressure drop for servo-controlled valves. Besides it is now also possible to recalculate existent valves.

COOLSTAR: Design of solenoid valves

Products of the manufacturers

  • ALCO

have been included. COOLSTAR enables you to design the most common valves of the manufacturers mentioned above. Several electronic expansion valves can be calculated as well.

This module includes products of

  • AWP
  • GMC

Similar to expansion valves, check valves are selected covering the cv value and under consideration of the minimum pressure drop.

Recalculation of existing valves is possible as well.

With help of this chapter, refrigerant compressors of

  • BOCK

may be calculated. Usually, two compressors are proposed for selection, so that you may determine your suitable compressor easily and quickly.

The calculation of coolers enables you to determine the required refrigerating capacity within a very short time.

With this module, you can calculate coolers up to a dimension of 100 m x 100 m x 100 m.

COOLSTAR includes the data of about 150 different cooling goods, so that for almost any cooling good the required data may be recalled any time. A calculation with data of your own goods is also possible.

The air change is calculated following the formula either of BÄCKSTRÖM or TAMM. Input of your own values is possible as well.

When calculating the required refrigeration capacity, COOLSTAR automatically considers the effects of fan and defrost heater. There is no need for annoying calculations back to the effective hours of operation.

COOLSTAR: Calculation of cold rooms

With this module, you may calculate the cooling load of air-conditioned rooms. Ground plans of any shape can be entered.

The program considers the adaption of inside to fluctuating outside temperatures as well as outside air change rate, glazing, number of people and sun protection.

For July and September, the development of thermal loads in the air-conditioned rooms is shown.

COOLSTAR: Calculation of air-conditioning (heat load)

COOLSTAR allows calculation of water nets with up to 100 cooling units, including the required components (shut-off valve, solenoid valve, check valve, circuit control valve, filter, two-way or three-way control valve).

COOLSTAR provides calculations with the specific data of the following refrigerants and brines:

Water, Antifrogen N, Antifrogen L, Antifrogen KA, Antifrogen KF, Fragolthermöle, HYCOOL 20 bis 50, Freezium, Glykosol N, Pekasol L, Pekasol 2000, Syltherm XLT, Temper -10 bis -60, Therminol D12, Thermogen, Tyfocor, Tyfocor L, Tyfoxit, Tyfoxit F, Zitrec MC, Zitrec LC.

The module includes components by the following manufacturers: ARI, BELIMO, BELVEN, BENDER, CIRCOR RTK, DANFOSS, ESBE, GEORG FISCHER, HERZ, HONEYWELL, MEIBES, NICAB, OEVENTROP, PARKER, RAMSAYER, SAUTER, SIEMENS, TACO, andTICOM. Of course, you may enter you own data as well.

The piping net can be calculated with the help of pressure drop or of flow velocity. The loss of pressure of the respective heat-exchanger is also considered.

The calculation of the chilled-water receiver is made dynamically in dependence of the coolant volume in the piping net. The data of the required circulation pump are determined and all selected components of the heat exchangers are adjusted.

COOLSTAR calculates the insulation required to prevent falling below the dew point (AEROFLEX, ARMAFLEX, ISOPIPE, KAIFLEX, THERMAFLEX, and WÜHRT).

COOLSTAR: Calculation of chilled-water net

This module enables you to design evaporators made by

  • ECO

The selection is made under consideration of construction type and rib distance. The calculation can be done following DTm or DT1.

COOLSTAR: Calculation of evaporators

The calculation has the same functionality as module "5. Calculation of piping net" with the difference that only one evaporation temperature can be selected and the circulation factor and the pump pressure difference must be specified.

The pump flow and return lines are dimensioned according to the pipe network and the height difference between the cooling point and the separator. The return line can be divided into up to 3 partial lines at riser points. The boiling delay due to the pressure loss of the pipe network is determined at all cooling points.

The valve stations for flow and return are designed for each cooling point. Up to 10 heat exchangers can be connected downstream of the valve stations.

Using this module, you can show the theoretical compression for pump refrigeration plants in a h log p diagram. Calculation can be made for any refrigerant without temperature glide.

Pre-adjustments can be made in the following ranges:

  • air pressure from 100 to 10,000 mbar
  • temperature rom - 50 °C to + 80 °C
  • specific humidity from 0 to 250 g/kg

For every air condition, values for temperature relative humidity, specific humidity, water vapour pressure, enthalpy and density, dew point and wetbulb temperature are show. By entering two values, all other values are calculated.

The module calculates the following changes of the aire: heating, cooling, dehumidifying, humidifying with scrubber or steam, and mixing. In all calculations the value to be calculated can be selected (air admittance and outlet, volume flow, or performances). Subsequent calculations can also be made. In this case, the air outlet value is taken as air admittance value of the subsequent calculation (e. g. mixing, heating, humidifying). The changes of state are displayed both in charts and tables.

COOLSTAR: H-X diagram (Mollier)

This module is designed for the use of R744 (CO2), R23 and R170 only. The refrigeration circuit can be calculated for both subcritical and transcritical projects as well as with and without gas bypass. The concept may include an internal chiller and/or a gas cooler. The transcritical pressure can be calculated COP optimized. The piping net is designed considering maximum operating pressures.

COOLSTAR: Transcritical process