frost top construction ???

[herefishy]

First of all, without doing a load calc or even speculating, why are we not redesigning the cabinet to adequatley reject the heat, rather than just deciding to do "less work"? Of course, due to the improperly designed compressor compartment, we are doing less work (higher condensing temperature), but decreasing capacity, in my humble opinion, will result in doing even less, "less work".


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The Bohn '43 evaporaotr is not 4,300 but/h. it is 430 btu/h per degree TD. Typically in this type of application (if properly engineered, we don't know) you would run about a 15F TD or approximately a 20F saturated suction temperature (coil temperature) and as such the "load" or heat transfer rate of the evaporator would be approximately 6,450 btuh. Though actually it would probably be more... we would need to know exactly what the parameters are... such as the questions that Gary keeps asking.. air in, air out, yadda yadda yadda....... but the 6,450 btu/h figure serves me well at this point.

If we assume the "rule of thirds" and apply it to your 1hp condensing unit (compressor), we would be in the ballpark if we assumed a capacity (at a 20F S.S.T.) of approx. 9,000 but/h which would indicate a reserve of approx 2,500 btuh/ serving the chill plate.

Sounds to me like you don't have much to play with. We could decisively make that decision, if we had all of the temps, pressures and other operating characteristics of the machine as it is running.