초록 ▼

A method and apparatus to recover energy from used or foul air and to return the energy into fresh air to reduce the energy input to a ventilation system. Ventilator apparatus is adapted to maintain fluid flow through a first heat exchanger, positioned in a fresh air passage, and through a second he

A method and apparatus to recover energy from used or foul air and to return the energy into fresh air to reduce the energy input to a ventilation system. Ventilator apparatus is adapted to maintain fluid flow through a first heat exchanger, positioned in a fresh air passage, and through a second heat exchanger, positioned in an exhaust passage, at a controlled rate to afford maximum or controlled heat transfer efficiency for pre-cooling or pre-heating fresh air drawn into the system. Control apparatus is provided to maintain flow of fluid through the heat exchangers such that the sum of the mass flow of fresh air times the specific heat of the fresh air, plus the mass flow of the exhaust air times the apparent specific heat of exhaust air, is equal to two times the mass flow of fluid times the specific heat of the fluid.

대표청구항 ▼

Apparatus to recover energy required to maintain the temperature of air in an enclosure within a predetermined temperature range comprising: means to admit fresh air into the enclosure from outside; means to exhaust air from inside the enclosure to the outside; a first heat exchanger in heat exchang

Apparatus to recover energy required to maintain the temperature of air in an enclosure within a predetermined temperature range comprising: means to admit fresh air into the enclosure from outside; means to exhaust air from inside the enclosure to the outside; a first heat exchanger in heat exchange relation with the fresh air; means sensing temperature of the fresh air after the fresh air has passed over the first heat exchanger; a second heat exchanger in heat exchange relation with the exhaust air; a closed system connected to the first and second heat exchangers; means to circulate liquid through the closed system between the first and second heat exchangers; and means to vary the flow rate of liquid through the closed system between the first and second heat exchangers in response to a change in temperature of the fresh air stream to maintain a constant mass flow of liquid through the first and second heat exchangers.