RU2029927C1 - Device for determining microclimate thermal comfort conditions - Google Patents

Abstract

FIELD: air conditions systems. SUBSTANCE: device has air temperature sensor 1, radiation temperature sensor 2, air velocity sensor 3, air relative humidity sensor 4, gang 5 of normalizing amplifiers, gang 6 of analogue-to-digital converters, gang 7 of selectors multiplexers, digital processing unit 8, indication unit 9, working memory device 10, digital-to-analogue converter 11. EFFECT: enhanced reliability. 1 dwg

Description

 The invention relates to ventilation and air conditioning, in particular to devices for monitoring air conditioning systems and microclimate on ships.

 A device for determining the conditions of thermal comfort of a microclimate [1], comprising an air temperature sensor, a radiation temperature sensor, a conversion system and an analog output. This device determines the operating temperature, which is a function of two variables: air temperature and radiation temperature.

 Not only air temperature and radiation temperature, but also air humidity and its mobility influence a person’s heat sensations. Their combined action determines the conditions of microclimate comfort.

 The disadvantage of this device is the incomplete accounting of climatic factors affecting the human body.

 A device is also known in which several instruments measuring individual thermophysical factors affecting a person’s heat perception, together with a summing circuit, determine a comfortable temperature [2]. Separate measured values are introduced into the circuit with weight coefficients corresponding to the share of their exposure, referred to the effect of air temperature.

 The disadvantage of this device is the inability to accurately describe the complex mathematical dependencies of the effects of individual factors by linear equations for implementation on an analog adder.

 The purpose of the invention is to increase the accuracy of determining the resulting temperature by using means of computer technology.

 The goal is achieved in that a unit for normalizing amplifiers, a block of analog-to-digital converters, a block of selector multiplexers are introduced into the device for determining the conditions of thermal comfort of a microclimate, containing an air temperature sensor, an air speed sensor, a relative air humidity sensor, a radiation temperature sensor and a computing unit , a digital-to-analog converter connected to one of the outputs of a computing unit made in the form of a digital processing unit, a random access memory into and an indication unit connected by one of the inputs to the output of the RAM, and the second input to one of the outputs of the selector-multiplexer block, the second output connected to the input of the digital processing unit, the second output connected to the input of the RAM, and the third - with a control input of the block of selectors-multiplexers, to the inputs of which the outputs of the block of analog-to-digital converters are connected, connected by its inputs to the corresponding outputs of the block of normalizing amplifiers, connected by its inputs to the outputs of the respective sensors.

 The drawing shows a functional diagram of the proposed device.

 The device contains four sensors: air temperature sensor 1 (copper resistance thermometer), radiation temperature sensor 2 (ball thermometer), air speed sensor 3 (hot-wire anemometer) and relative air humidity sensor 4 (hygrometer). The outputs of the sensors are connected to the inputs of block 5 normalizing amplifiers, the outputs of which are connected to the inputs of block 6 of analog-to-digital converters (AMS). The number of outputs of block 6 depends on the number of sensors and the capacity of the ADC. All outputs of block 6 of the ADC are connected to the input of block 7 of selector-multiplexers with two outputs. The operation of block 7 is controlled by a digital processing block 8 with three outputs, the first output of which is connected to the input of block 7 of multiplexer-selectors. One of the outputs of block 7 is connected to the input of digital processing block 8, and the second to the indication block 9. The second output of the digital processing unit 8 is connected to the input of random access memory (RAM) 10, and the third to the input of the digital-to-analog converter (DAC) 11. The output from the RAM is connected to the second input of the digital indication unit 9. The signals from sensors 1-4 in block 5 of normalizing amplifiers are converted into standard electrical signals, which allows the use of various types and modifications of sensors with different parameters of the output signals. These signals are converted in the block of analog-to-digital converters into a parallel digital code and fed to the input of block 7 of selector-multiplexers. Block 8 of the digital signal processing gives a command, in accordance with which block 7 connects a specific analog-to-digital converter from block 6 of analog-to-digital converters to block 8 for digital processing and to block 9 indications. Block 8 of digital processing according to a predetermined program reads information from the ADC block through block 7 of selector-multiplexers and processes it. The results of information processing are received in RAM 10 for storing the results of calculations and in the DAC 11 for receiving an analog signal. The calculation results from the random access memory 10 enter the display unit 9, on the display of which at the same time the digital values of all four input parameters from four sensors and the value of the resulting temperature are displayed.

 A device for determining the conditions of thermal comfort of the microclimate is currently used to test new shipboard air conditioning systems.

 Using a device to determine the conditions of thermal comfort of a microclimate by determining the resulting air temperature in a ship's air conditioning system will significantly reduce the time for setting up and monitoring the operation of the air conditioning system, increase the accuracy of evaluating the entire heat balance and take into account the complex effect of all microclimate parameters on the human body.

Claims (1)

 A device for determining the conditions of thermal comfort of a microclimate, comprising an air temperature sensor, an air speed sensor, a relative air humidity sensor, a radiation temperature sensor and a computing unit, characterized in that, in order to improve accuracy, a unit of normalizing amplifiers, an analog-to-digital unit are introduced into it converters, a block of selector-multiplexers, a digital-to-analog converter connected to one of the outputs of the computing unit, made in the form of a digital processing unit, ope an active memory device and an indication unit connected by one of the inputs to the output of the random access memory, and the second input to one of the outputs of the selector-multiplexer unit, the second output connected to the input of the digital processing unit, the second output connected to the input of the random access memory and the third - with the control input of the block of selectors-multiplexers, to the inputs of which the outputs of the block of analog-to-digital converters are connected, connected by the inputs to the corresponding outputs of the norm block amplifiers connected to the outputs of the respective sensors.