Wieland WKE 44 coaxial evaporator (41.9 kW at 7.0 m³/h of 12 °C water, 0 °C evaporating, R410A)
Pipe-in-pipe exchanger — Coaxial evaporator — 41.9 kW from water 12.0 to 6.9 °C, evaporating at 0.0 °C, 1.94 kg/s.
A Wieland listing, from the manufacturer's published data.
Units: SI · US customary
Published specification
| Rated water | 12.0 to 6.9 °C |
| Rated evaporating temperature | 0.0 °C |
| Water flow at the rating | 1.94 kg/s |
| Duty at the rating | 41.9 kW |
| Conductance (from the rating) | 4.56 kW/K |
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Same family
How the model reads against this maker's data
| Coaxial exchanger model against a maker's measured condenser and evaporator tables, one conductance per model | 554 over 8 models | every rating reproduced exactly. Condensers on R410A (R404A/R507 is printed identical): −13 to +16 % of the printed duty, RMS 7.9 %, the condensing temperature within 3.0 K — at one flow the duty is proportional to the temperature difference as the model has it, but the conductance rises with flow (as flow^0.4 on three of the four) and at the lowest flows the hot gas heats the water past the condensing temperature, which no isothermal model does. Evaporators on R410A: −18 to +63 %, RMS 22 %, within 3.2 K — the conductance rises with flow (flow^0.3–0.5) and with the temperature difference (as boiling that strengthens with the heat flux, and a 5 K suction superheat that takes more of the tube the smaller the difference, would make it), so one conductance over-reads most at a low flow and a 6 K difference. The other refrigerants are R410A times one ratio each — R134a 12 % under on the condensers and 20 % under on the evaporators, R404A/R507 7 % over on the evaporators — which a listing that carries no refrigerant reads as R410A |
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Listed from published data; a listing's figures are the manufacturer's, the model that runs them is ours. Solver results never depend on who has claimed what.