A laboratory investigation of the thermal properties of soil in relation to ground coil design for the heat pump

xiflually 1b the result of field etudlea conducted In a specific locality and the use of such data for design ijurposes In other areas would be q\iestionable.Heat transfer in soil is directly affected by moisture, density, thermal conductivity, and specific heat. REVIEW OP LITERATUREAccording to Spom, Ambrose, and SaumslBter (18) there is no fundamental difference between the conventional refrigeration syBtem and the so-called "heat pump" system* Both systems consist of comprsBsor, condenser, evaporator, 8>nd expansion valve to absorb heat from a low temperature level and reject it at a higher temperature level, A system making use of the rejected heat, as the heat pump does, cannot be correctly called a refrigeration system since cooling is not the primary objective of the cycle.The heat pump ByBtem is Bometimes erroneously called the "reverse-refrigeration cycle."Kemler, Oglesby, and Pease (11) point out that the heat pt«np is not a new idea, its having been proposed by Lord Kelvin as early as I852.However, the heat ptunp had very limited use before 1950.An abundance of electric powerIn some regions of the world gave rise to its use in some industrial applications after this date.One such region was Switzerland where industrial heat pumps proved to be competitive when the cost of 1 ton of coal was approximately equal to the cost of 900 KWH of electrical energy.The present trend In tViO manufacture of heat pumps is toward small "package type" units, from 5 to 10 hp.These package units are being utilized for both home and industrial applications.Ambrose (1) says that an Ideal source of heat for the heat pump is one which is abundant and inexpensive and having an average year round temperatiure of 40 to 800 F, According to Kemler (10) the earth Is the most universal

Hali tarjima qilinmagan