Patent CA-1273491-A (CA)
Inventor: OTSUKA NOBUO
IPC: F25D17/00
Filed: 1989-04-26
Granted: 1990-09-04
Abstract: ABSTRACT OF THE DISCLOSURE           The present invention relates to an air-conditioning apparatus comprising a heat source apparatus for producing warm air or cool air, an air blower and an air duct for distributing the warm air or the cool air from said heat source apparatus to each of rooms, air quantity adjusting dampers, each being dis-posed in a branched duct connected to said air duct for each room, and a room thermostat disposed in each of said rooms, com-prising a heat load measuring means which receives signals corre-sponding to an established room temperature determined by said room thermostat and an actual room temperature detected by said room thermostat, and measures a heat load for each of said rooms based on the difference between the established temperature and the detected temperature, a damper control means for controlling the degree of opening of said dampers on the basis of an output of said heat load measuring means, at least one of an established temperature determining means for determining the value of the established temperature for the air passing in said air duct and an established pressure determining means for determining the value of the established pressure for the air in said air duct based on the value of the heat load of each of said rooms mea-sured by said heat load measuring means, wherein at least one of said air blower and said heat source apparatus is controlled by using an output from said established pressure determining means, wherein said heat source apparatus is of a capacity changeable type, said air blower is adapted to feed the air heated or cooled by said heat source apparatus at a substantially constant pres-sure, and said established temperature determining means is adapted to determine the value of an established temperature for the air in said air duct based on the greatest value among the heat loads in each of said rooms measured by said heat load mea-suring means, and which further comprises a temperature measuring means which receives and processes a detection signal from a tem-perature detector disposed in said air duct, a capacity determin-ing means for determining the capacity of said heat source appa-ratus based on an output from said temperature detector and an output from said established temperature determining means, and a capacity control means for controlling said heat source apparatus based on an output from said capacity determining means, wherein said established temperature determining means comprise means to determine the value of an established temperature in said air duct to be at a limit value of the lower limit temperature for room-warming operation and the upper limit temperature for room-cooling operation, which allows the operation of said heat source apparatus when the greatest value for heat load is not greater than zero; to determine said value to be a limit value at the upper limit temperature for room-warming operation and the lower limit temperature for room-cooling operation when the greatest value for heat load is the same as or higher than the established value; and to determine said value to be a temperature in propor-tion to the greatest value for heat load when the greatest value is in the range from zero to said established value.