| Construction of the third R134a system (Phase-Change III) |
| Page 1: Phase-Change II: problems and solutions |
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The Phase-Change II system ran fine for months, but the seals used to keep the secondary
coolant from escaping were not methanol-resistant. There was also a large pressure drop
over the evaporator, and the capillary tube was not able to adapt to the huge load variations that
occur during normal operation. This all called for a rebuild of the system. The refrigerant<->coolant
heat exchanger had to be replaced with a full metal one to cope with the methanol, and the capillary had
to be replaced with an expansion valve to be able to cope with the load variations.
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