The use to e of tetrafluoropropenes, particularly (HFO-1234) in a variety of applications, including refrigeration equipment, is disclosed. These materials are generally useful as refrigerants for heating and cooling, as blowing agents, as aerosol propellants, as solvent composition, and as fire extinguishing and suppressing agents.

Compositions containing fluorine substituted olefins

A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a building includes a monitoring device installed at the building, a monitoring server located remotely from the building, and a review server. The monitoring device measures an aggregate current supplied to components of the HVAC system and transmits current data based on the measured aggregate current. The monitoring server receives the transmitted current data and, based on the received current data, assesses whether failures have occurred in first and second components of the HVAC components. The monitoring server generates a first advisory in response to determining that the failure has occurred in the first component. The review server provides the first advisory to a technician for review and, in response to the technician verifying that the failure has occurred, transmits a first alert.

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Hvac system remote monitoring and diagnosis

A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a residence includes a monitoring device installed at the residence and a server located remotely from the residence. The monitoring device measures an aggregate current supplied to a plurality of components of the HVAC system and transmits current data based on the measured aggregate current. The server receives the transmitted current data and, based on the received current, assesses whether a failure has occurred in a first component of the plurality of components of the HVAC system and assesses whether a failure has occurred in a second component of the plurality of components of the HVAC system.

Residential solutions hvac monitoring and diagnosis

A system and method for managing energy consumption of a building system includes a source of actual energy consumption data (430), a source of actual weather data (440), and a database (420) correlating discrete weather data values with expected energy consumption values for at least one component of the building system. A computer accesses the actual weather data, actual energy consumption data (430) and database (420), wherein the computer compares (450) the expected energy consumption values with actual energy consumption data and generates an output (470) based on the comparison. The expected energy consumption values are generated for the discrete weather data values using an energy consumption model that functionally relates discrete weather data values and design information for the buiding system component.

Model-based alarming

A system and method for monitoring the food product and refrigeration system performance of a remote location includes a management center in communication with a remote location through a communication network. The management center receives performance information of the refrigeration system at a remote location. The management center employs software modules to analyze the performance information, diagnose system conditions, and provide alarms for food safety and quality issues, refrigeration system component failure, and indicate maintenance conditions.

System for remote refrigeration monitoring and diagnostics

A method for controlling a motor vehicle air conditioning system is described. The motor vehicle air conditioning system comprises a refrigeration circuit including a refrigerant compressor, a condenser, an evaporator and a throttle device arranged upstream of the evaporator. The condenser is associated with a ventilating fan and the evaporator is associated with a blower. The compressor capacity, the condenser capacity and the evaporator capacity are directly or indirectly sensed by sensor means and supplied as electrical variables to an electronic control circuit which logically combines these input signals and generates output signals in dependence on at least two of these capacity values and including further parameters. The control circuit acts on electrically controllable acturators for influencing the compressor capacity, the condenser capacity and/or the evaporator capacity.

Method for controlling a motor vehicle air conditioning system

When considering charge-air cooling in vehicle engines, it is necessary to distinquish between commercial and passenger applications on the one hand, and diesel and gasoline engines on the other. The requirements for the various types of application will be outlined, and the characteristics of the various charge-air cooling systems discussed. In general, heat transfer rate and pressure drop are considered in evaluating the suitability of a charge-air cooler for a particular purpose. The effectiveness of such a procedure, however, tends to be limited. In order to create new criteria for evaluation, new terms such as the efficiency of density recovery and ''half-value performance'' have been developed. Optimisation of the core geometry according to the requirements and desired objective functions is necessary and shows that one single system cannot meet the wide range of requirements. Some practical applications and future trends are outlined.

The Selection and Evaluation of Charge-Air Coolers for Vehicle Engines

In a refrigeration installation (1) for motor vehicles, consisting of an oil-lubricated compressor (2), a condenser (3) connected downstream of the compressor (2), a throttle member (5) and an evaporator (6), an increase in capacity of the installation is achieved by there being provided between the compressor (2) and the condenser (3) an external oil separator (8) which separates the lubricating oil situated in the refrigerant from the refrigerant, and by the separated oil being cooled via a cooler (condenser 3) and supplied to the compressor (2) again. The use of an external oil separator (8) reduces the proportion of the oil situated in the refrigerant to 1 to 2% by weight.

Method and device for increasing the capacity of a refrigeration installation for motor vehicles

1. Heating circuit for motor vehicles, particularly passenger cars, comprising at least one air heating element through which the internal combustion engine coolant flows and which transmits the heat of the coolant through convectional heat exchange to air conveyed by a fan to heat the vehicle interior, and comprising a latent heat accumulator, characterised in that other heating elements (14, 15), which are in the form of plate heating elements or surface heat exchangers (22, 23, 24, 25, 26, 27) and are arranged on the floor and/or on the side panels in the interior (21) of the vehicle (20), are connected to the heating circuit (1, 2, 3, 4), and that the latent heat accumulator (9) and the surface heat exchangers (14, 15) are connected or can be connected as a fully enclosed circuit.

Rolf Dr.-Ing. Wallner

Papers

Method for controlling a motor vehicle air conditioning system

The Selection and Evaluation of Charge-Air Coolers for Vehicle Engines

Method and device for increasing the capacity of a refrigeration installation for motor vehicles

Heating circuit with a heat accumulator for motor vehicles