Conveying Temperature Information in a Controlled Variable Speed Heating, Ventilation, and Air Conditioning (HVAC) System

a technology of variable speed heating and ventilation, which is applied in the direction of ventilation systems, heating types, instruments, etc., can solve the problem that the variable speed controlled compressors do not typically operate at their maximum efficiency

Inactive Publication Date: 2008-01-03
COMPUTIME LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]With another aspect of the invention, a thermostat unit instructs a compressor controller unit to stop operation immediately in an emergency situation by sending a signal with a pulse or pulses having a short time duration.

Problems solved by technology

However, with this control mechanism, a variable speed controlled compressor will not typically function at their maximum efficiency.

Method used

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  • Conveying Temperature Information in a Controlled Variable Speed Heating, Ventilation, and Air Conditioning (HVAC) System
  • Conveying Temperature Information in a Controlled Variable Speed Heating, Ventilation, and Air Conditioning (HVAC) System
  • Conveying Temperature Information in a Controlled Variable Speed Heating, Ventilation, and Air Conditioning (HVAC) System

Examples

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Embodiment Construction

[0021]FIG. 1 shows a thermostat unit 100 for controlling a variable speed compressor (not shown) in accordance with an embodiment of the invention. Thermostat unit 100 includes microprocessor control unit (MCU) 107 and switching module 105. Switching module 105, which electrically turns on and off, may be implemented with a relay, triac, or field effect transistor (FET). Additionally, thermostat unit 100 may include keypad input 111 in order for a user to input a set temperature or a profile of set temperatures (as will be discussed) and display 113 to display the ambient temperature of a controlled space (e.g., a room) and the set temperature.

[0022]Microprocessor control unit 107 measures the ambient temperature of the controlled space with thermistor 109, which is situated in an appropriate point of the controlled space. Microprocessor control unit 107 consequently determines a difference temperature (Tdiff) by subtracting the set temperature (Tset) from the ambient temperature (T...

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Abstract

The present invention provides methods and apparatuses that support the transfer of data from a thermostat unit to a controller unit to control a variable speed heating, ventilation, and air conditioning (HVAC) system. The duty cycle of a signal (that is sent from a thermostat unit to a controller unit) is adjusted in accordance with a temperature difference between the ambient temperature of an environmentally controlled space and a set temperature. The controller unit measures the duty cycle to determine the temperature difference and adjusts the speed of a blower motor or compressor in accordance with the temperature difference. The signal is switched on and off, in which the AC waveform is conducted and blocked by the thermostat unit and received by the controller unit. The controller unit measures the duty cycle of the received signal, determines the temperature from the duty cycle, and adjusts the speed from a predetermined relationship.

Description

FIELD OF THE INVENTION[0001]The present invention relates generally to the field of controlling a variable speed heating, ventilation, and air conditioning (HVAC) system, and more particularly to sending a signal that conveys a temperature difference from a thermostat unit to a controller unit.BACKGROUND OF THE INVENTION[0002]With the price of energy steadily increasing, there is an increasing need to enhance the efficiency of heating, ventilation, and air conditioning (HVAC) systems. One approach to increase the efficiency of a HVAC system is to incorporate a variable speed controlled compressor in the system for the cooling function. The latest technology typically employs a sophisticated microprocessor controller unit (MCU) and a digital signal processor (DSP) to support a high performance inverter type variable speed controlled compressor. The speed (revolutions per unit time) of a variable speed controlled compressor depends on the temperature difference of the set temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F24F7/00F25B49/00
CPCF24F11/008F25B49/025F25B2600/021Y02B30/741F25B2600/0253F25B2700/2104G05D23/2417F25B2600/0251G05D23/1913G05D23/24F24F11/83Y02B30/70F24F11/86
Inventor HA, WAI-LEUNGCHENG, CHUNG MINGLEI, KAIRY KEI
Owner COMPUTIME LTD
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