| 摘要 |
A space heating unit comprises a pump forcing a working fluid such as a heavy synthetic oil through a shearing means to effect working and consequent heating thereof. The thus heated working fluid is passed through a heat exchanger to warm air circulating therethrough. The space heater is designed to operate cyclically with the heat exchanger and thus the working fluid being maintained at a minimum operating temperature by means of a heat store in heat exchange contract with at least a portion of the heat exchanger. The heat store contains for example a eutectic mixture of salts which undergo a phase change at about the minimum operating temperature desired for the working fluid. The heat store removes and stores heat energy from the unit when it is operating and returns its heat energy to the unit when the unit is in its at-rest mode, thereby maintaining the temperature of the unit and of the working fluid for the next cycle.
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