Control of outdoor air source water heating using variable-speed

Refrigeration – Processes – Exchanging heat between plural systems – e.g. – disparate

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62215, 622284, F25B 700, F25B 100

Patent

active

050521861

ABSTRACT:
An integrated heat pump and hot water system of the type having a variable speed compressor is controlled during a water heating mode, in which outdoor air serves as the heat source. The controlling is carried out on the basis of a field of outside temperature and water temperature. The compressor speed is controlled based on the outdoor air temperature, and the compressor is run at a maximum speed between a minimum outdoor temperature and a low temperature somewhat above the minimum, at minimum speed for outdoor air temperature between a maximum temperature and a high temperature below the maximum temperature, and at a speed that depends linearly on outdoor temperature for intermediate outdoor temperatures. There is a permissible temperature field or envelope bounded by the minimum and maximum outdoor temperatures, by minimum and maximum water temperatures, and by an efficiency floor and a torque limit ceiling.

REFERENCES:
patent: 4420947 (1983-12-01), Yoshino
patent: 4856578 (1989-08-01), McCahill
patent: 4893476 (1990-01-01), Bos et al.

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