This paper describes the design and performance analysis of a variable-capacity heat pump system developed for a small [1800ft (167 m)] prototype net ZEH with an average design cooling load of 1.25 tons (4.4 kW) in five selected US climates. The heat pump integrates space heating and cooling, water heating, ventilation, and humidity control (humidification and dehumidification) functions into a...

Microwave heating is a dielectric heating process, in which heat is generated via the interaction of dielectric materials with electromagnetic radiation. The dielectric constant is a measure of the material’s capacity to retard microwave energy as it passes through, while the loss factor is a measure of the material’s capacity to dissipate the energy. The materials with high loss factor are eas...

This paper presents detailed information about testing and validation of cooling and heating coil models. The work has been carried out under Subtask D of the International Energy Agency’s SHC Task 34/ECBCS Annex 43 (Testing and Validation of Building Energy Simulation Tools). The goal of this Subtask (Mechanical Equipment and Control Strategies) was to develop and test methods that would help ...

Air curtain is a widely used heat insulation equipment in the market, which reduces exchange efficiency of both sides by air surface formed jet. In order to reduce use electric heating device curtain, new designed coupling experiment source pump and heating. The fan preheated condenser pump, so as dependence on parts, save energy consumption.

Measurement of the heat loss from equipment in buildings is necessary in order to make accurate assessments of its impact on cooling loads. Recent advances in the design of buildings and improvement of the thermal characteristics of insulation materials and building envelope systems have significantly reduced the cooling load from external sources; however, the addition of various types of offi...

A methodology was developed to design the number and capacity for each piece of equipment (e.g., gas engines, batteries, thermal storage tanks) in a microgrid that has a combined heat and power (CHP) system. In this design methodology, annual cost including the annual operation cost and the annual initial cost is minimized. Based on calculations using this design methodology, it is found that s...

A modern world contains varieties of electronic equipment and systems like: TV, security system, Hi-fi equipment, central heating systems, fire alarm systems, security alarm systems, lighting systems, SET Top Box, AC (Air Conditioner) etc., we need to handle, ON/OFF or monitor these electrical devices remotely or to communicate with these but, if you are not at the home or that place and you wa...

There have been a number of studies of the physiological effects of different tracheal pressure wave patterns in patients requiring artificial ventilation with intermittent positive pressure (IPPV) (Werko, 1947; Cournand et al., 1948; Maloney et al., 1953; Watson, 1962a, b; Bergman, 1963, 1967; Grenvik, 1966; Auchinloss and Gilbert, 1967; Robinson, 1967; Herzog and Norlander, 1968; Adams et al....

The description is given of a model for concrete in compression at elevated temperature that incorporates elastic, plastic and creep strains as functions of the temperature and stress history. The plastic strain and the creep strain depend on the stress history and the stiffness of the model depends on the load level during fire exposure. The proposed model is an updated version of a model pres...

Existing building energy simulation tools have a purported tendency to over-predict heating use and, in some cases, to under-predict cooling use, an outcome often attributed to inappropriate assumptions about thermostat management. As a result, a systematic review was conducted for the purposes of determining typical heating and cooling set points for single-family houses in North America. The ...