The ways of energy saving in air heating of cabins of mobile machinery (tractors, trucks, harvesters) and production facilities are discussed. It is shown that in the cabins of mobile machines with a relatively small volume with no exhaust ventilation to reduce energy consumption for heating, while regulating temperature at workplace and relative humidity, is to use partial recirculation of treated air. Specific recommendations for the heating of the mobile machine cabins, which is characterized by basic parameters such as thermal performance, air flow and temperature are given. It was found that the partial recirculation of the treated air in the cabin of the mobile machine has allowed to reduce energy consumption for heating in 1.94 times and provided on working place of operator normalizable relative humidity without any additional units for humidification. It is shown that in areas of larger volume, where maintenance and repair is carried out in the presence of local exhaust ventilation, standard for relative humidity could be provided only with humidifier. Thus in order to reduce energy consumption for heating it is necessary to dispose the exhaust air heat flow to preheat the incoming air using the heat exchanger-recuperator provided with an exhaust air dryer to avoid freezing of apparatus at low ambient temperature conditions. The filler of drying unit could be silica gel as water absorption by silica gel is accompanied by increasing treated air temperature and in the heating system it leads to energy consumption and is a positive characteristic.

No abstract

No abstract

No abstract

For mobile objects, at the moment, foreign companies supply for Russia a wide range of air conditioning devices based in on the refrigerant refrigerant (freon) refrigerators. They are designed for use in fundamentally different from our climatic conditions, characterized by a relatively short warm period of the year, which should be taken into account when choosing the operating modes and composition of the functional parts of air conditioning units. Two variants of the design of two-stage water-evaporative air coolers made according to a separate scheme are proposed, where as a first (main) unit intended for air conditioning, a block is used that contains a successively placed water-air heat exchanger and a water-sprayed nozzle, and as a second (auxiliary) unit, intended for the preparation of cold water supplied to said water-air heat exchanger of the first unit, a cooling tower is used, containing in one variant irrigated only nozzle, and in the second variant - unit, similar to the air conditioning unit. Comparison of the IKPV and IRKV with the pilot KPO and RKV (T02), as well as with the coolant conditioner, shows that they are almost as cool as the experimental ones, having a significantly lower mass at acceptable overall dimensions of the roof unit and have the possibility of additional “wer” cleaning it from fine dust and gaseous impurities; basing the design of the proposed coolers on the units used in the normalization of the microclimate makes it possible to create, if necessary, the modification of IKPV and IRKV of various capacities; in the climatic conditions of Russia, which do not require dehumidification of conditioned air, innovative coolers are comparable by the condition of providing in the tractor cabs normalized parameters of the microclimate with refrigerant air conditioning devices, significantly exceeding them in terms of energy saving. Their introduction in areas with dry hot climate can make an alternative to cold-air conditioners, which they significantly exceed in terms of energy saving.