Abstract
Purpose. The research paper proposes to estimate the effect of heat inertia of the water heating system, in transient operation modes, on the temperature condition in the passenger car, as well as to offer technical solutions intended to reduce the heating system inertia effect and to maintain a stable temperature condition in the passenger car premises in transitional modes of the heating system. Methodology. The author developed the method for controlling the heat transfer of heating system pipes with the help of regulating casing. To control the heating system and the heat transfer of heating pipes, two types of temperature control sensors were used in the passenger car: certain sensors interacted with regulatory casings, while the others interacted with high-voltage tubular heating element control devices. To assess the efficiency of heat interchange regulation of heating pipes and the heating system control, with installed regulating casings, the operation of the heating system with regulating casings and two types of sensors was mathematically modelled. Mathematical modelling used the experimental test data. The results of experimental tests and mathematical modelling were compared. Findings. Currently in operated passenger cars, control of heating appliances is not constructively provided. Automatic maintenance of the set temperature in a passenger car is limited to switching on and off of high-voltage tubular heating elements. The use of regulating casings on heating pipes allows reducing the effects of heat inertia and maintaining stable thermal conditions in a passenger car, using the heating system as a heat accumulator, and also provides the opportunity to realize an individual control of air temperature in the compartment. Originality. For the first time, the paper studied the alternative ways of regulating the temperature condition in a passenger car. Using of the heating system as a heat accumulator. Practical value. The regulation of the heat transfers of the heating pipes by regulating casings allows reducing the effect of thermal inertia of the heating system on the temperature condition in a passenger car, implementing individual adjustment of air temperature in a compartment within 40% of the power of the heating pipe section, using the heating system as a heat accumulator.
Highlights
During operation, it is practically impossible to maintain the required heat transfer fluid temperature in the passenger car boiler
The purpose of this study is to develop technical solutions to improve the design of the water heating system, in order to ensure a stable temperature condition in the passenger car premises in transitional modes of the heating system
The process of differences occurs as follows: when the car air temperature drops to 18 °C, the control equipment switches on the highvoltage tubular heating elements; during the time of overcoming the inertia of the heating system, the car heat loss continues and the car temperature drops; when the system is heated the air temperature rises; upon reaching 22 С, the control equipment switches off the high-voltage tubular heating elements, but in view of the large heating system inertia, the car air continues to heat up to equality between the car heat loss and thermal output of heating tubes, whereby the car air temperature ranged between 17 ÷ 25 C
Summary
It is practically impossible to maintain the required heat transfer fluid temperature in the passenger car boiler. This is due to the shutdown of high-voltage electric heating tubes of the heating system. The reasons for the shutdown are different during moving and standing with subsequent heating, resulting in transient heating modes that cause temperature fluctuations in passenger cars. This process is compounded by the fact that during moving and standing of a passenger car the required heating capacity of the heating system is different, the higher the speed of the car, the more the required heating capacity of the heating system increases, this is confirmed by the results of the study [4], Fig. 1. The installed sensors for monitoring the temperature in the car have no correction for the inertia of the heating system
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
