Test chamber - HVIS - HLK Stuttgart
The company HLK Stuttgart offers a range of services including measurements and simulations for heating and air conditioning. It uses its own dual climate chamber to test residential ventilation equipment and heat pumps for example.
The outer chamber conditions the fresh air, while the inner chamber is responsible for the room conditions. The system which is operated with ethylene glycol provides an initial supply temperature of -25 °C for an air intake temperature down to -15 °C. HLK relies on the HVS and HVIS air coolers from Roller here.
| Application | Environmental simulation |
|---|---|
| Address | Stuttgart / Germany |
| Fluid | 55 % Etylene glycol |
| Product | HVIS752N + HVS407EC |
Test chamber - SV - Cooltherm
In a variety of applications, Cooltherm uses our special air coolers of the SV type, where not only cooling but also, to a limited extent, humidification and dehumidification are required. The set of these pictures shows the SV air cooler integrated into chilled water systems, 1/ in a test chamber, in which a temperature between 20 and 40°C, with a relative humidity between 50 and 75%, must be maintained according to the test specimens. 2/ in a calibration room with room temperatures between 18 and 35 °C, at a relative humidity of between 40 and 75%.
| Application | Test chamber |
|---|---|
| Address | Germany |
| Fluid | Water |
| Product | SV 442 / SV 444 |
Cryogenic test chamber - LE/LK - F. Zaugg
In order to guarantee the quality and resistance of materials, tests under extreme conditions are necessary. To maintain a room temperature of -60°C in this cryogenic test chamber, the system builder, F. Zaugg AG Kälte und Klima, used a special two-stage Roller direct evaporator coil for cascade operation. The test chamber is first cooled to -20°C with R449a via the first circuit. When this temperature has been reached, the second circuit with the cryogenic refrigerant R23 is switched on and the first circuit now cools the cascade condenser for the cryogenic circuit. In order to reliably generate the evaporation temperature of -66°C in the second circuit, the requirements regarding the nature of the evaporator coil as well as the thermodynamic requirements are very specific. In close cooperation with the customer, an optimally suitable solution was also found for this project.
| Application | Environmental simulation |
|---|---|
| Address | Swiss / Thun |
| Fluid | R449a / R23 |
| Product | LE / LK |
Water samples - LK - PMC Markgröningen
The company PMC from Markgröningen/Germany builds special cooling units which run in independent water sample cabinets with 24 V batteries and without an external power supply. Because the water samples which are to be cooled can be corrosive, the special heat exchangers from Roller were produced with tin-coated copper tubes and Roller gold lacquer fins.
| Application | Environmental simulation |
|---|---|
| Address | Markgröningen /Germany |
| Fluid | |
| Product | LK 280/3/3/2,5 |
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