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Wine Room Evaporator / Condenser Match Question - Need Guidance
Hi all! Hope you are enjoying your Summer.
I'm in the final stages of planning a wine room refrigeration system. The previous evaporator coil sprung a leak and the whole system is pretty old. I've been wanting to try Zoomlock fittings, so I bought a Zoomlock hand crimping tool from Amazon to give it a go. I'll also add a fan control and the new condenser will have a receiver. Will post pics and impressions when complete.
The wine room is pretty small and adjacent to the living room, so I'm going to use a gravity coil I found with a suction temp of 38F. The room temperature will be 55F. Based on insulation and wine room construction, the evaporator heat load is around 1500 to 2000 BTU/hr, so with compression heat I am shooting for a condenser of about 2500 btu/hr.
Which leads me to my questions..
1) Condenser operating data is spec'd at different evaporating operating temperatures: 25 ,30 ,40, etc. This is the evaporator suction temperature, correct?
2) Condenser ambient temperatures are listed at 90, 100, etc, and capacity obviously increases when the condenser in in a cooler environment. My next question is, if I need 1850 btu/hr (16hr recommended run time) and the condenser output changes based on ambient temperature, at what operating point do I select to specify the correct condenser? The gravity coil manufacturer stresses that the condenser capacity should not be larger than the gravity coil capacity, which is 2035btu/hr at 38F suction / 17F TD. Even some 1/5hp units might be close to exceeding 1850btu/hr at 70F ambient, but this information is not given. What is the convention when matching evaporators and condensers? Do I extrapolate to the city average temperature for ambient temperature and plan on longer run times for hot days? I am missing something and need some guidance.