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<p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">Dear </span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">I used a heat exchanger (air /water) the hot side
fluid is water extracted from a storage tank connected to solar thermal
collector and the cold side fluid is an air.</span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">Hot side inlet temperature and cold side inlet
temperature are known and are in function of time, and the cold side outlet
temperature is imposed 68°C; how achieve a constant temperature with this model?
</span></p>
<pre><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">Please help me the fastest possible it is very urgent; thank you and <span style=""> </span>apologize for this bad English <span style=""> </span>text</span></pre>
<pre><span style="font-size: 12pt; font-family: "Times New Roman","serif";">Best regards</span></pre><pre><span style="font-size: 12pt; font-family: "Times New Roman","serif";">imen</span></pre>
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