Duct type multizone air conditioning system

• US 4,716,957 A
• Filed: 03/26/1986
• Issued: 01/05/1988
• Est. Priority Date: 03/29/1985
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Yamazaki, Kisuke, Otsuka, Nobuo, Thompson, Peter, Igarashi, Hideo
• Primary Examiner(s): Cline, William R.
• Assistant Examiner(s): Ford, John K.
• Application Number:
  US06/844,182
• Time in Patent Office: 650 Days
• Field of Search: 165/12, 165/22, 165/29, 165/11.1, 236/1 B, 236/46 R, 236/49, 236/94
• US Class Current: 165/209
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/523 for displaying temperature data
• CPC Class Codes: F24F 11/67 Switching between heating and cooling modes
• CPC Class Codes: F24F 11/74 for controlling air flow rate or air velocity
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2110/12 of the outside air
• CPC Class Codes: F24F 3/001 in which the air treatment in the central station takes place by means of a heat-pump or by means of a reversible cycle reversible cycle for humidifying and drying air F24F3/147
• CPC Class Codes: F24F 3/044 Systems in which all treatment is given in the central station, i.e. all-air systems
• CPC Class Codes: G05D 23/1917 using digital means
• CPC Class Codes: G05D 23/1934 each space being provided with one sensor acting on one or more control means

Abstract

An air duct type multizone air conditioning system having air dampers and corresponding thermostats in respective zones under the control of a main controller. The main controller can override desired temperatures selected by the corresponding thermostats in any of the zones and automatically detects the number of the number of zones, the presence of an auxiliary heater, and a heat pump, and the presence of an air damper and corresponding thermostat properly located in the same zone. The main controller also receives information regarding the operating cost of the heat pump and the auxiliary heater to ensure their cost-effective use.

Claims

1. A duct type multizone air conditioning system having a cooling and heating heat pump, a heating gas burner, a supply air duct for supplying air to a plurality of zones to be air conditioned, and a blower fan for forcibly circulating conditioned air through the duct to the plurality of zones to be air conditioned comprising:

a plurality of temperature detecting means, respectively disposed in corresponding ones of the zones to be air conditioned, each temperature detecting means detecting a present temperature of the corresponding one of the zones;

a plurality of air damper means, respectively disposed in corresponding ones of the zones, for controlling the supply air to the corresponding zones to be air conditioned;

a plurality of zone temperature setting means, respectively disposed in corresponding ones of the zones, each temperature setting means setting a present set temperature for the corresponding one of the zones;

means for controlling the opening and closing of the air damper means so that the present temperatures detected by each of said temperature detecting means become said present set temperatures set by said zone temperature setting means;

means for automatically determining the number of the zones to be air conditioned;

mean sfor automatically determining the presence of an air damper means and corresponding temperature detecting means in each zone;

means for automatically determining the presence of a heating gas burner and the presence of a heat pump within the air conditioning system;

means for automatically determining the presence of a damper means and corresponding temperature setting means in the same zone; and

means for receiving heat pump cost and heating gas burner cost information so as to ensure cost-effective use of the heat pump and heating gas burner.

2. A duct type multizone air conditioning system according to claim 1 wherein said means for controlling the opening and closing of the air damper means comprises:

main temperature setting means for simultaneously setting a present set temperature for a set of said plurality of zones;

memory means receiving the present set temperatures from said main temperature setting means and from said plurality of zone temperature setting means, for providing signals corresponding to the present set temperature set by said main temperature setting means and signals corresponding to the present set temperature set by said plurality of zone temperature setting means, and for storing the present set temperatures from said main temperature setting means and the present set temperatures from said plurality of zone temperature setting means; and

temperature determining means for comparing the stored present set temperatures with the received present set temperatures and when incoincidence occurs, altering a stored present set temperature in accordance with the incoincidence.

3. A duct type multizone air conditioning system according to claim 2 wherein said main temperature setting means and said zone temperature setting means each respectively comprise display means for displaying the corresponding present set temperature and the present temperature.

4. A duct type multizone air conditioning system according to Claim 1 wherein said means for controlling the opening and closing of the air damper means comprises:

timer means for providing time signals corresponding to sequential times;

reset means for manually entering a present set temperature and for setting an associated predetermined time corresponding to a time signal received from said timer means;

means for storing said manually entered present set temperature and said associated predetermined time; and

display means for displaying said predetermined time and said manually entered present set temperature.

5. A duct type multizone air conditioning system according to Claim 4 wherein said means for controlling the opening and closing of the air damper means further comprises:

check means for checking the manually entered present set temperature and the associated predetermined time.

6. A duct type multizone air conditioning system according to claim 1 further comprising:

analyzer means, operatively connectable to said means for controlling the opening and closing of the air damper means, for providing initializing information to the opening and closing means necessary for air conditioning control, including said heat pump cost and heating gas burner cost information.